HomeMy WebLinkAboutViper Analysis Report - 11-17-2011 - 1 - Attachment 2November 9, 2007
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CTA Communications Orange RaCE Test Report
Table Of Contents
1.0 Introduction ..................................................................................................
..............................3
1.1 Purpose ....................................................................................................................................
..............................3
2.0 Results .........................................................................................................
..............................4
2.1 Test Data ................................................................................................................................
............................... 4
4
2.2 Derived Coverage Maps .........................................................................................................
...............................
3.0 Summary Of Testing And Conclusions Reached .........................................
..............................6
3.1 Talk -In DAQ ....................................................................................................................................
..............................6
6
3.2 Talk -Out DAQ ................................................................................................................................
...............................
3.3 RSSI ................................................................................................................................................
..............................6
3.4 Overall Test Conclusions ................................................................................................................
..............................7
4.0 Recommendations .......................................................................................
..............................8
5.0 Definitions And Process ...............................................................................
..............................9
5.1 Channel Performance Criterion ..............................................................................................
............................... 9
5.1.1 Delivered Audio Quality .......................................................................................................
..............................9
Table 5 -1 Delivered Audio Quality Definitions ............................................................................
............................... 9
5.1.2 Signal Level ........................................................................................................................
.............................10
5.2 Service Area and Conditions ..................................................................................................
.............................10
5.3 Validated Service Area Reliability ...........................................................................................
.............................10
5.4 Continuous By Time Test Mode .............................................................................................
.............................10
5.5 Test Sampling
10
5.5.1 DAQ Test Sample ...............................................................................................................
.............................10
5.5.2 Passed /Failed DAQ Test Sample .......................................................................................
.............................11
5.5.3 Received Signal Strength Indicator (RSSI) Test Samples .................................................
.............................11
5.5.4 Passed /Failed RSSI Test Sample ......................................................................................
.............................11
5.5.5 Digital Scout .......................................................................................................................
.............................12
6.0 Equipment And Test Setup .......................................................................
..............................
6.1 The RaCE Test Set .............................................................................................................
............................... . . 13
Figure 6 -1 RaCE Test Setup
14
Table 6 -1 RaCE Stationary Location Equipment ........................................................................
.............................14
Table6 -2 RaCE Mobile Location Equipment ..............................................................................
.............................15
6.2 The RaCE Test Sequence ......................................................................................................
.............................15
6.3 The RaCE Test Set Calibration ..............................................................................................
.............................15
Table 6 -3 RSSI & Attenuation Accuracy Verification Equipment ................................................
.............................16
6.4 DAQ Testing Attenuation ........................................................................................................
.............................16
Table 6-4 Mobile Unit Talk -Out Correction For Portable Receive ..............................................
.............................17
Table 6 -5 Mobile Unit Talk -In Correction For Portable Receive .................................................
.............................18
Figure 6 -2 Bi- Directional Attenuation Details ..............................................................................
.............................18
6.5 Specific Equipment Test Setup for DAQ and RSSI Testing ..................................................
.............................19
6.6 Test Radios .............................................................................................................................
.............................20
7.0 Test Method ................................................................................................
.............................21
7.1 RaCE Test System Capabilities and Characteristics ..............................................................
.............................21
7.1.1 Talk -In and Talk -Out DAQ Testing .....................................................................................
.............................21
7.1.2 RSSI Test Mode ..............................................................................................................
...............................
22
7.2 Geographic Areas and Sites Tested .....................................................................................
...............................
7.3 Monitored Frequencies ...........................................................................................................
.............................22
.............................22
Table7.1 Viper Radio Frequencies ............................................................................................
AppendixA Setup Procedures .........................................................................
.............................24
A.1 Pre -Ship Procedures ..............................................................................................................
.............................24
A.2 Post -Ship Procedures .............................................................................................................
.............................24
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A.3 Pre -Test Procedures ............................................................................................................... .............................25
A.4 Conclusion of each Day of Testing ......................................................................................... ............................. 25
25
A.5 Prolonged Interruptions .......................................................................................................... .............................25
A.6 Conclusion of Final Testing ................................................................................................ ...............................
AppendixB Coverage Maps ............................................................................. .............................26
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1.0 Introduction
Radio system coverage conformance testing is defined by three performance criteria:
channel performance criterion (CPC), service area definition with conditions, and the
validated service area reliability.
The RaCE test set was designed by CTA to measure end -to -end radio system coverage
performance. The RaCE test set can be utilized for conformance testing. It can also be
used to test and evaluate other system coverage performance characteristics. The
RaCE test set consists of two units: a stationary unit and a mobile unit. The combination
of these units allows sequential testing of both RF uplink and downlink communication
paths. The RaCE test set is capable of testing the entire RF communication path,
measuring the talk -out signal strength of the control and working channels, and directly
measuring the delivered audio quality (DAQ) of both the talk -out and talk -in RF path.
1.1 Purpose
Orange County Emergency Services in Orange County, North Carolina tasked CTA to
conduct an evaluation of the radio coverage provide by the State's Voice Interoperability
Plan for Emergency Responders (VIPER) network within their service area.
There were two specific goals of this testing:
• To determine the DAQ (Delivered Audio Quality) the VIPER radio system can provide
to Orange County Emergency Services.
• To gather signal strength (control channel) data from the seven VIPER sites most
likely to provide service to Orange county.
CTA Communications Orange RaCE Test Report
2.0 Results
Data collected was post - processed to provide the coverage maps described in SECTION
2 -1 below. These maps are contained in APPENDIX B:
2.1 Test Data
A consolidation of test data is contained in an Excel spreadsheet called Final Report Map
Data.xls. The fields for the Final Report Map Data.xls spreadsheet located in the root of
the final result CD are as follows:
GRID REFERENCE
The grid number on the map
TEST DIRECTION -
Talk -In (The mobile transmission to the base)
Talk -Out The base transmission to the mobile
WAVE FILE -
The wave file number associated with the
articular grid reference and Test Direction.
MOBILE DAQ -
The Delivered Audio Quality score on the
mobile unit.
STATIONARY DAQ
The Delivered Audio Quality score on the
-
stationary or base unit.
AFFILIATED -
The site number of the site the talk -in test is
affiliated with.
BEST SERVER -
The site number of the site with the highest
RSSI.
BEST SERVER
The RSSI value of the BEST SERVER site.
RSSI -
LATITUDE -
The Latitude where this test took place.
LONGITUDE -
The Longitude where this test took place.
2.2 Derived Coverage Maps
• FIGURE B -1 -Test Locations —The GPS locations of where testing occurred.
Talk -in and talk -out DAQ results — The first "Valid" measurement for the grid is used.
Surplus DAQ measurements are ignored. The grid number is labeled inside of the
grid to facilitate looking up information in the Final Report Map Data.xls spreadsheet.
To find a particular wave file for a test find the Grid Number and Test Direction then
look in the WAVE FILE column for the correct wave file. These wave files are located
in the IQS Details directory in the final result CD.
• FIGURE B -24alk -in DAQ for a hip- mounted portable —Grid results for the talk -in
(Mobile to Base) test.
• FIGURE B- 3- talk -out DAQ for a hip- mounted portable —Grid results for the talk -
out (Base to Mobile) test.
• Received Signal Strength Indication (RSSI) measurements for the site control
channel. — Continuous by Time measurements are used for these results.
o FIGURE B-4- Camden RSSI
o FIGURE B -5 -Cane RSSI
o FIGURE B-6- Chatham RSSI
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o FIGURE B -7 -Cole Mill RSSI
o FIGURE B-8-Hillsborough RSSI
o FIGURE B -9 -Laws RSSI
o FIGURE B- 10 -UNC RSSI
• FIGURE B -11 -BEST SERVER RSSI —The highest RSSI value for a given test point
from all of the site RSSI measurements.
• FIGURE B -12 -BEST SERVER SITE —The site with the highest RSSI value for a
given test point.
FIGURE B -13 -Best Server - Affiliation — By grid test results that combine the Site
Affiliation and the Best Server RSSI results. The color of the center of the grid
represents the site that the mobile was affiliated with during the talk -in test. The
boundary color of the grid represents the site with the highest RSSI value for that
grid. If the colors match, then the affiliation would appear to be correct. If the colors
don't match then there is a disparity between which site the talk -in test was affiliated
with and which site had the highest RSSI.
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3.0 Summary Of Testing And Conclusions Reached
3.1 Talk -In DAQ
The Talk -In DAQ results for the analog channel tested are indicated in FIGURE B - 2.
Out of 705 test grids, 317 grids passed (Passed grid = 3.0 or higher, see SECTION 5.1
for channel performance criterion). This equates to a portable on the hip talk -in reliability
of 45 %.
3.2 Talk -Out DAQ
The Talk -In DAQ results for the analog channel tested are indicated in FIGURE B - 3.
Out of 695 test grids, 467 grids passed (Passed grid = 3.0 or higher, see SECTION 5.1
for channel performance criterion). This equates to a portable on the hip talk -out
reliability of 67 %.
3.3 RSSI
FIGURES B - 4 through B - 10 indicate the RSSI measurements for the following sites:
Camden, Cane, Chatham, Cole Mil, Hillsborough, Laws, and UNC. These show the
received signal levels for the control channel of the indicated sites that were collected
during the DAQ testing. Green colored dots have sufficient signal strength to support
portable -on- the - street communications. Gray colored dots have signal levels sufficient
for mobile communications, but probably not strong enough to support reliable portable
operation. Red colored dots indicate signal strength too low for reliable communications
of any kind to or from the selected radio site.
FIGURE B -11 indicates the highest RSSI value for a given test location from all the sites
to show overall system performance based upon signal strength alone. Out of 1084 total
test locations, 918 of those locations have a RSS greater than -93 dBm which should be
sufficient to support portable on the hip operations. This corresponds to an area
reliability for portable operations of 85 %. An additional 151 test locations had sufficient
signal strength to support mobile operations (> -102 dBm). This gives a mobile
operations area reliability of 98 %. Only two (2) percent of the locations tested did not
have sufficient signal strength to support any radio operations.
FIGURE B -12 indicates where each of the seven sites tested had the highest RSSI value
and would be the ideal best server for the area.
FIGURE B -13 is a consolidation of the where the radio was affiliated with during the DAQ
testing and best server information that was obtained from the RSSI measurements
indicated in B -12. The border shading of the grids indicate the site that had the highest
received signal strength for that location. The interior color of the grid indicates which
site, based upon the mobile radio's transmit frequency, the radio was actually affiliated.
In areas where the colors match, then the affiliation would appear to be correct. If the
colors don't match then there is a disparity between which site the talk -in test was
affiliated with and which site had the highest RSSI.
CTA Communications Orange RaCE Test Report
3.4 Overall Test Conclusions
Many of the Talk -in DAQ failures can be explained somewhat by comparing the site
affiliation with the best server RSSI in FIGURE B -13. During many of the Talk -in calls,
the mobile radio was not affiliated with the best site based on the different colors of the
center of the grid and the boundary of the grid. There is no way to determine if that same
condition existed with the Talk -out tests because test equipment only detects the transmit
frequency mobile radio.
Based on FIGURE B -11 Best Server RSSI, if the mobile had affiliated to the strongest
site it is probable that the number of failed grids would have been lower.
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Orange RaCE Test Report
4.0 Recommendations
Based upon the test results, it is CTA's opinion that Orange County should not rely on the
VIPER system as its sole means of public safety communications until the County has
had further time to analyze the coverage test data and the conditions that caused the
observed anomalies. Operation on this system should be better understood, together
with the proper programming of radios and determining of how to utilize the "roaming"
feature between towers as well as discussions with the radio vendor to look at the
hysteresis levels of the radios and determine if the affiliation settings can be optimized to
insure that the maximum chance of successful communication is realized and that these
changes result in performance levels that will satisfy Orange County coverage
requirements.
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5.0 Definitions And Process
5.1 Channel Performance Criterion
The channel performance criterion (CPC) describes the radio system
performance /understandability in terms of a specific threshold signal level (median
microvolt level) or threshold delivered audio quality value (DAQ).
5.1.1 Delivered Audio Quality
The delivered audio quality (DAQ) designations used in this document are defined by
TIA/EIA TSB -88 -B as shown in TABLE 5 -1. For the purpose of this test, we used a CPC
of DAQ -3. The DAQ field test measurement data were post - processed and the results
are included in the coverage maps provided with this report. The coverage maps indicate
three ranges: no access, DAQ 0 to 2.99 and DAQ 3 to 5.
Table 5 -1 Delivered Audio Quality Definitions
Delivered
Audio ouality
Performance Definition
DAQ -0
No Speech Detected (CTA Definition)
DAQ -1
Unusable, speech present but unreadable; SINAD equivalent
intelligibility: less than 8 dB
DAQ -2
Understandable with considerable effort; frequent repetition due
to noise and distortion; SINAD equivalent intelligibility: 12 dB
DAQ -3
Speech understandable with slight effort; occasional repetition
required due to noise and distortion; SINAD equivalent
intelligibility: 17 dB
DAQ -3.4
Speech understandable with repetition only rarely required;
some noise and distortion; SINAD equivalent intelligibility: 20 dB
DAQ-4
Speech easily understood; occasional noise and distortion;
SINAD equivalent intelligibility: 25 dB
DAQ -4.5
Speech easily understood; infrequent noise and distortion;
SINAD equivalent intelligibility: 30 dB
DAQ -5
Speech easily understood; SINAD equivalent intelligibility:
greater than 33 dB
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5.1.2 Signal Level
This performance specification involves defining the minimum receiver signal level
required to provide the desired level of understandability. For example, a typical grade of
service specification could be, "a median 0.5 microvolt signal at the receiver antenna
terminal."
5.2 Service Area and Conditions
The service area is the area in which two -way radio communications are required; the
radio system should meet the desired CPC throughout the service area. Often the
service area is defined by a political or municipal boundary.
It is also necessary to define the conditions associated with the service area. These
conditions include requirements such as outdoor or indoor coverage, building
penetration, portable or mobile coverage, portable at the hip and /or portable at the head
level.
For the Orange County testing, the service area was defined as the County's political
boundary and the radios were set up to simulate portable at the hip coverage.
5.3 Validated Service Area Reliability
Validated service area reliability is defined as the percentage of locations in the service
area to and from which radio communications meet or exceed the desired CPC.
The validated service area reliability value in per cent is calculated by dividing the
number of valid test measurements within the defined service area that meet or exceed
the required CPC divided by the total number of valid test measurements.
The entire concept of conformance testing relies on statistics. Validated service area
reliability is determined on the basis of measuring a statistically significant number of
random test locations, uniformly throughout the defined service area. These required
statistical elements are defined in the TIA/EIA TSB -88 -B.
5.4 Continuous By Time Test Mode
This test was set up as a pre- determined drive route to get a sampling of data throughout
the County. In order to maximize the data collected, we utilized the Continuous by Time
test mode. With continuous by time testing, tests are performed whenever the specified
time interval has passed. For Orange County testing the test interval was set for 20
seconds.
5.5 Test Sampling
The RaCE test set is capable of gathering samples on the basis of talk -in and talk -out
DAQ measurements and /or talk -out RSSI measurements. For these tests, both were
collected.
5.5.1 DAQ Test Sample
A DAQ test sample is a single talk -in or talk -out evaluation performed at a test location.
The test is initiated when the mobile unit enters an untested grid in the "gridded" test
mode.
The mobile unit sends a test message to the stationary unit (talk -in). The location
established for this talk -in transmission is the latitude and longitude of the mobile unit
when the message began. The stationary unit records this mobile talk -in transmission
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and then initiates a talk -out message. The talk -out message is received at the mobile
unit, recorded, and analyzed. The location of the talk -out DAQ measurement is
established as the latitude and longitude of the mobile unit when the talk out message
began. In this manner, both paths (talk -in and talk -out) are evaluated in RaCE testing.
5.5.2 Passed /Failed DAQ Test Sample
A passed test sample is one in which a message is received and equal to or exceeds the
established DAQ threshold value. A failed test sample is one in which a test sample
message is initiated and either no reply message is received within the test timeout or the
received message is below the established DAQ threshold value. Test sample result
locations are established based on the location of the mobile at the start of the test
message. Regardless of the pass or fail result, the actual audio file is retained as part of
the test file both for after - the -fact confirmation, and also for any future analysis that might
be indicated.
5.5.3 Received Signal Strength Indicator (RSSI) Test Samples
Received Signal Strength Indicator (or Indication): A measurement in dBm that
represents the strength of the incoming (received) signal in a receiver.
The mobile test unit has two additional auxiliary receivers and antennas to perform RSSI
measurements. During testing, the RSSI receivers scan through the stored frequency
table and collect samples based upon the analog -to- digital conversion of the voltage
present on the automatic gain control line from the receiver. These samples are
collected continuously except during the talk -in DAQ test transmission. Ten samples are
collected per frequency at an average rate of 57 samples per second and then the
receiver scans to the next frequency. The receivers have been programmed to allow 50
milliseconds to tune to the next frequency on the scan list and settle before beginning the
series of RSSI measurements at the new frequency. See FIGURE 5 -1 below. The
dynamic range of the ICOM receiver is -55 dBm to -120 dBm with a 1 dB resolution. The
median value of a frequency's samples that were collected during the talk -out message is
used for analysis and display. This data was post - processed and included in the test
results section of this report.
f, 1 f, 3 f, 9 f21 f2 3 f29
♦ f12 . * f, 10 f f2 2 , f f210
•• •I I 1 1 1 0 0 0
Sec
50 msec
5.5.4 Passed /Failed RSSI Test Sample
A passed RSSI test sample is one in which the recorded signal level of the sample is
equal to or exceeds the established CPC threshold. A failed RSSI test sample is one in
which the recorded signal level of the sample is below the established CPC threshold.
Test sample result locations are established based on the location of the mobile at the
start of the test message.
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5.5.5 Digital Scout
A recent addition to the RaCE test system is the Optoelectronics Digital Scout. This
device measures the transmit frequency of the MOBILE unit in the vehicle during the
Talk -In test. This allows us to determine site affiliation.
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Orange RaCE Test Report
6.0 Equipment And Test Setup
6.1 The RaCE Test Set
FIGURE 6 -1 on the following page shows the RaCE test set block diagram. The RaCE
test set consists of two test units: a stationary test unit and a mobile test unit. The mobile
and stationary test units consists of a mobile radio (Motorola XTL -5000) supplied by
Orange County Emergency Management, a mobile antenna, a GIPS receiver and
antenna for establishing the test vehicle location and test sequence timing, a laptop
computer running CTA's RaCE software and the equipment to connect these items
together. The mobile test unit has an additional auxiliary receiver and antenna to
measure RSSI from the designated repeater.
The Orange County mobile radios were preprogrammed with a wide -area talk group
labeled "OCMAID" for this test and provided to CTA prior to the actual testing, so that we
could physically interface the radios with the RaCE mobile and stationary units.
Equipment lists for the RaCE test set stationary and mobile units are provided in TABLES
6 -1 and 6 -2.
The RaCE test unit was setup for the Continuous By Time test mode.
The test setup required additional attenuation as described in SECTION 6.4, to match the
Orange County portable on- the - street coverage at the hip design configuration with that
of the mobile radio with a vehicle antenna test configuration of the RaCE test set.
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Figure 6-1 RaCE Test Setup
Orange RaCE Test Report
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MOBILE
r- - - - - - - - - - -
FME0
LOCATION
LOCATION
SP
n7'.
..............
W01-
L— — — — — — — — — — — -
Table 6-1 RaCE Stationary Location Equipment
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Table 6 -2 RaCE Mobile Location Equipment
6.2 The RaCE Test Sequence
When a test sequence occurs, the mobile unit transmits a pre- recorded message to the
stationary unit. The stationary unit receives the mobile's message and evaluates it for
talk -in DAQ. When the mobile unit finishes transmitting, the stationary unit transmits a
pre- recorded message to the system. The mobile unit receives the stationary unit's
message and evaluates it for talk -out DAQ, and concurrently records the RSSI. The
stationary unit is located close to the radio repeater site, to provide a strong and stable
signal area and therefore be "captured" by the site under test.
6.3 The RaCE Test Set Calibration
The RaCE software includes a proprietary algorithm that evaluates DAQ based on the
noise and distortion in the received audio of the RaCE test message. DAQ is not based
on signal strength or on bit error rate. Using telecommunication professionals, CTA has
calibrated (and continues to do so) the effects of noise and distortion on DAQ scores, and
uses this input to validate (and occasionally revise) the proprietary algorithm inherent in
the RaCE software. RSSI is measured by receivers calibrated as part of the test setup.
The RSSI receivers were calibrated using the procedures listed in APPENDIX A. The
verification equipment used for calibrating the RSSI receivers is listed in TABLE 6 -3.
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Table 6 -3 RSSI & Attenuation Accuracy Verification Equipment
6.4 DAQ Testing Attenuation
Orange County Emergency Management requested that CTA evaluate the VIPER radio
system under portable on- the - street coverage with the portable mounted on the hip.
Since the RaCE test set uses a mobile radio with a vehicle- mounted mobile antenna,
attenuation must be added to simulate a portable radio mounted on the hip. An
additional attenuation factor is needed for the transmit direction of the mobile radio to
account for the lower portable output power.
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Orange RaCE Test Report
Both talk -in and talk -out directions must be adjusted to account for the differences in
gain /losses between these two different configurations. Different attenuation factors for
talk -out and talk -in are achieved by using a circulator in the RaCE mobile unit antenna
feed line as shown in FIGURE 6 -2. The values for the attenuators are shown in this
figure and calculated as follows.
In the RaCE mobile unit talk -out direction, attenuation is needed to account for the
difference in receive sensitivity of the test mobile and the receiver sensitivity of the typical
portable, as well as the difference in the antenna losses for these two different
configurations. We first select the amount of attenuation (Attenuator #1) needed to
simulate the corrected talk -out attenuation required. This value is calculated to be 6.5 dB
and a commonly available 6 dB attenuator was used for this purpose. The loss through
the circulator of approximately 0.6 dB is factored into the calculations, and the test set -up
talk -out correction is calculated to be 6.6 dB including the loss for the circulator. TABLE
64 summarizes the calculation of attenuation needed for the RaCE mobile unit talk -out
correction to simulate the typical portable operational configuration.
The next step is to calculate the attenuation needed for the RaCE mobile unit talk -in
correction, taking into consideration the difference in test mobile transmitter power and
typical portable transmitter power, as well as the difference in antenna system losses
between these two configurations. This value was calculated to be 15.7 dB. As shown in
FIGURE 6 -2, this is comprised of the series of Attenuators #1, Attenuator #2 and the
circulator. An additional 9.1 dB of attenuation is needed and two commonly available
attenuators totaling 9.3 dB of attenuation was utilized. TABLE 6 -5 summarizes the
calculation of the attenuation needed for the RaCE mobile unit talk -in correction to
simulate the typical portable operational configuration.
Ttshin a-A Mnhilp unit Talk -Out Correction For Portable Receive
Receiver Sensitivity
Portable
Mobile
Antenna System Losses
Portable Talk -Out Antenna System
Total for at the Hip
Mobile Talk -Out Antenna System
Mobile Antenna
Mobile Coax
Circulator
Total for Mobile Talk -Out Antenna
-119.0 dB
-119.0 dB
Sensitivity Difference -0 dB
0.0 dB
1.9 dB
0.6 dB
•o
2.5 dB
Antenna System Loss Difference 6.5 dB
Total Talk -Out Correction Attenuation 6.5 dB
Test Set -Up Talk -Out Attenuation (per FIGURE 3 -2) _
(Attenuator #1 + Circulator)
Attenuator #1 selected to be 6 dB
Test Set -Up Talk -Out Attenuation is (Attenuator #1 + Circulator) 6.6 dB
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Table 6 -5 Mobile Unit Talk -In Correction For Portable Receive
Transmit Power
Mobile (25 Watts)
Portable (3 Watts)
Antenna System Losses
Portable Talk -In Antenna
System
Total for At the Hip
Mobile Talk -In Antenna
System
44.0 dBm
34.8 dBm
Transmit Power Difference
we
9.2 dB
Mobile Antenna 0.0 dB
Mobile Coax 1.9 dB
Circulator 0.6 dB
Total for Mobile Talk -In 2.5 dB
Antenna
Talk -In Antenna System Loss Difference 6.5 dB
Total Talk -In Correction Attenuation 15.7 dB
Talk -In Attenuation (per FIGURE 3 -2)
_ (Attenuator #1 + Attenuator #2 + Circulator)
Attenuator #1 6 dB
Circulator 0.6 dB
Additional Talk -In Attenuation needed 9.1dB
Attenuator # 2 selected to be 9.3 dB
Test Set -Up Talk -In Attenuation is
Attenuator #1 + Attenuator #2 + Circulator 15.9 dB
Figure 6 -2 Bi- Directional Attenuation Details
TX
9.3 dB
TX/RX
DUAL CIRCULATOR 6 dB TRANSCEIVER
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Orange RaCE Test Report
In operation the transmit path is through TX & TX/RX, the circulator and the antenna.
The receive path is through the antenna, the circulator and TX/RX. The loss through the
circulator of approximately 0.6 dB is factored into the required calculations.
6.5 Specific Equipment Test Setup for DAQ and RSSI Testing
The stationary unit was setup in room 311 (top floor) at the Holiday Inn Express 202
Cardinal Drive in Hillsborough. The stationary antenna was placed on the refrigerator
inside of the room. A very strong control channel signal from the Hillsborough site was
received by the radio at this location.
The mobile unit was setup in CTA's Chrysler van. The mobile radio antenna was placed
in the center of the roof at the front of the van. Only one ICOM receiver was used to scan
the control channel frequencies. The RSSI antenna was placed on the center of the roof
towards the rear of the van.
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6.6 Test Radios
The Orange County Emergency Management XTL -5000 mobile radios were
preprogrammed with a wide area talk group labeled OCMAID. In addition to the Orange
County Mutual Aid talk group the radios were programmed with a simplex channel called
TA -1. The simplex channel appeared to be a digitally modulated channel. This was the
channel that was used for audio level alignment prior to testing on the system. After
arriving on site and getting the system up and operational it became apparent that the
system was actually operating in Analog mode.
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7.0 Test Method
7.1 RaCE Test System Capabilities and Characteristics
RaCE coverage tests were conducted both in the "talk -in" and "talk -out" directions using
radios designed to operate in the system under test. The results from these tests are
correlated in a post - processing step to allow presentation on a detailed map of the test
area. Received signal strength (RSSI) information was also gathered for the control
channels of other IWN radio sites as the mobile traversed the test area. All of the tests
were conducted in the continuous by time mode. Each measurement was tagged with
position and time information derived from a GPS receiver attached to the mobile unit.
This allows for the accurate display of the test locations as well as the correct correlation
of "talk -in" to "talk -out" results.
7.1.1 Talk -In and Talk -Out DAQ Testing
In talk -in and talk -out DAQ testing, the mobile unit initiates the test by sending a test
message and the stationary unit responds with the same test message. A minimum
mobile speed of 5 mph was set to initiate the test in order to include the effects of multi -
path fading. The mobile unit operates the PTT line and waits for a transmit power sensor
"TX" condition lasting for at least 0.5 seconds. This can only occur if a channel grant has
been obtained in trunking systems and assures the availability of a talk path through the
system. The test message is then sent to the transmitter followed by a return to the
receive condition. At the stationary unit, the test message is recorded and permanently
stored together with a time stamp. The time stamp is used in post - processing to
correlate the actions of the two units in order to display the transmit position of the mobile
unit. The stationary unit then generates a new test message and sends it out to the
mobile unit while keeping track of the time sent.
The mobile unit receives and stores the message along with the position and time stamp.
The message is then analyzed for DAQ. A color code is assigned to the tested position
on the operator's map indicating the DAQ as seen by the mobile. The mobile then waits
until the proper time has elapsed before repeating the process.
7.1.2 RSSI Test Mode
The RSSI Test Mode is used for received signal strength recording during the DAQ Test
Mode or it may be used as a standalone test. The recording of RSSI will show the
received signal level in dBm during the receive portion of the DAQ test using the same
time and position. A minimum speed of 5 miles /hour is imposed on the start of each data
gathering period to prevent long periods of data when the vehicle is stopped as well as to
average out multi -path fading effects.
-21- H MM I . ECO
CTA Communications Orange RaCE Test Report
7.2 Geographic Areas and Sites Tested
The first day of testing, 9/25/2007, the focus of testing was on the southern side of
Orange County where Route 85 bisects the county. Special emphasis was placed on
obtaining a large number of samples around the Chapel Hill area. The next day of testing
the northern half of the county was tested. Main roads and secondary roads were
chosen to facilitate testing the greatest number of grids in the limited amount of time
allotted according to the predetermined test route.
The list below represents the sites tested.
SITE NUMBER
SITE
LATITUDE
LONGITUDE
1
CAMDEN
36.01972
- 78.8683
2
CANE
35.94639
- 79.4358
3
CHATHAM
35.86667
- 79.1664
4
COLE MILL
36.03925
- 78.9583
5
HILLSBOROUGH
36.06181
- 79.1219
6
LAWS
36.24139
- 79.1233
7
UNC
35.91014
- 79.0553
7.3 Monitored Frequencies
Frequencies monitored during the test are indicated in TABLE 7 -1. WC indicates a
working channel and CC indicates the control channel.
-22-
H MM I AECOM
Table 7 -1
Viper Radio
Frequencies
NUMBER
SITE NAME
CH T�PE
RX FRE�
tXFREQ
1
CAMDEN
WC
821600000
866600000
1
CAMDEN
WC
822412500
867412500
1
CAMDEN
WC
822912500
867912500
1
CAMDEN _ _ . "_......
. WC ......
823587500
868587500...
1
C_ AMDEN
CC
823875000
868875000
2
CANE `
WC
821350000
866350000
2
CANE
WC
821862500
866862500
2 _
_ CANE
WC " " " " " " ""
822400000 ""
867400000 ;
2
CANE
WC
823475000
868475000
2
.........
CANE
m .. _�... ....... -
CC
823862500
868862500
3
CHATHAM
WC
821237500
866237500
3
CHATHAM
WC
821662500
866662500
3
CHATHAM
WC
822212500
867212500
3
CHATHAM
WC
823412500
868412500
3
CHATHAM
CC
823687500
868687500
4
COLE MILL ... "_.. ,
WC
866275000".._
4
COLE MILL
WC
821987500
866987500
4
COLE MILL
WC
822275000
867275000
4
COLE MILL
WC
822775000
867775000
-22-
H MM I AECOM
CTA Communications
Orange RaCE Test Report
SITE
�bMBER
SITE NAM�
CH TYPE
RX FREQ
TX FREQ
4
COLE MILL
cc
823775000
868775000
......... .. 5
HILLSBOROUGH
WC-
8211751000
5
HILLSBOROUGH
WC
821450000
866450000
5
HILLSBOROUGH
WC
821775000
866775000
5
HILLSBOROUGH
WC
822337500
. .......... - - -----------
867337500
- - ---- --"- - — - - ------
.......... 5
HILLSBOROUGH
...........
WC
822712500
8677111,21.5100
5
HILLSBOROUGH
WC
823312500
868312500
5
HILLSBOROUGH
WC
823525000
5
HILLSBOROUGH
CC
8687125.00,
6
LAWS
WC
821112500
866112500
6
................................
.. .......... LAWS---
WC-1-1-1-1
81121141750-001
6
LAWS
WC
822050000
867050000
6
LAWS
WC
822562500
867562500
6
LAWS
cc
. . . ..........
823850000
868850000
- - - ------ - .....................
7
........... - ''I'll" .............
UNC
WC
821075000
866075000
..........
7
UNC
WC
821387500
866387500
... . ........... ..
7
UNC
82.11712500
86671,2500
7
UNC
WC
822162500
... ........ - - - - -----
867162500
... . ...........
7
UNC
WC
822487500
81.6741811750110-11�
7
- - - ---------- --
UNC
. ........
WC
822987500
---- - ------
867987500
7
UNC
WC
823387500
868387500
7
UNC
cc
823825000
............. .
868825000
- 23 - HSMM I AECO-,Ni
CTA Communications Orange RaCE Test Report
Appendix A Setup Procedures
A.1 Pre -Ship Procedures
Before departing Lynchburg, the following procedures were executed:
1. Install current and approved version of the RaCE software.
2. Set and verify audio levels from the Orange County provided radios under test.
3. Install RaCE hardware and verify radio operation.
4. Calibrate RaCE RSSI receivers using the following procedures:
• With the computer connected to the RSSI receiver to be checked, start the RaCE
subroutine that allows the monitoring of the digital RSSI output of the receiver.
• Connect the signal generator to the receiver /pre - amplifier combination.
• Set the signal generator to a frequency near the mid point of the band to be
calibrated and set the software to program the radio to the same frequency.
• Adjust the output level to the point where the RSSI count just reaches 255 and
note the level in dBm.
• Decrease the output in 1 dB steps and record the RSSI value for each step until
the RSSI indication becomes 000.
• Enter the results into the RaCE calibration table for the receiver.
5. Complete Loss Calculation table and select attenuation level for portable mounted at
the hip simulation.
Perform RaCE system bench testing and verification.
6. Install stationary and mobile RaCE and verify system operation in a talk around mode
using assigned VHF frequencies.
7. Extract data from mobile and stationary units and verify correlation routines work and
that the data is acceptable.
A.2 Post -Ship Procedures
On arrival at the testing site, the following procedures were executed:
1. Mobile Unit— Reproduce the mobile configuration established above.
2. Verify the Mobile Unit frequencies to be tested are correctly input into RaCE.
3. Stationary Unit — reproduce the stationary configuration established above.
4. Verify the Stationary Unit test frequencies are correctly input into RaCE.
-24-
t" SMM I AECOM
CTA Communications
Orange RaCE Test Report
A.3 Pre -Test Procedures
Before commencing testing each day, the following procedures were executed:
1. Initiate the RaCE self diagnostic tests to assure that the system continues to operate
correctly.
2. Verify that the attenuation is correctly established for the testing to be conducted
during the day.
AA Conclusion of each Day of Testing
At the conclusion of testing each day, the following procedures were executed:
1. Extract data from the mobile and stationary computers.
Run the post - processing software.
2. Verify that the extracted data is acceptably correlated and merged.
3. Preserve the extracted data on a CD -ROM or other external storage media.
A.5 Prolonged Interruptions
Before testing resumes after a prolonged (greater than 4 hours) interruption, the following
procedures are executed:
1. Perform the daily self - diagnostic test — take corrective action(s) as needed.
2. Verify attenuation settings and other equipment settings.
A.6 Conclusion of Final Testing
At the conclusion of the final testing session, the following procedures were executed:
1. Extracted and preserved all test data.
2. Packed and shipped the equipment back to Lynchburg.
-25- N MPa! I � ECO
CTA Communications
Orange RaCE Test Report
Appendix B Coverage Maps
-26- HSMM I AECOM,
- LAWS
II _
Burlington • •!�— f
1� ( -•••f HILLSBOROUGH•
000 4f
��� • • M 1 1 �� COLE MILL
4 •• '! • ! ! CAMDEN
y \ • ! _ Ar t
� !f !4P
CANE Durham
\\ � t • ♦ - ` '
# >'
i"
•! *sow UNC
to -
_ •;r
CHATHAM —
• F t
r
Miles f Raleigh
10 '
0 � 2.5 - 15 i
Figure - B1
Drive Route &
All Sites
Client: Orange County, NC
Commission No. 20089A
Data Sources and Notes
Design: GDM - 23 Oct, 1007
Drawn: GDM - 23 Oct, 1007
Checked RCB - 23 Oct, 1007
Approved: RCB - 23 Oct, 1007
File Name: WkFILES\20089 Orange County RaCE\
2DO89A Coverage Testing \GIS\
Figure_01 -Drive Route.mxd
Revise
CTA Communications
www.CTACommunications.com
+1 (434) 239 -9200
r;W
r
Ir4
026 Irr.
Figure - B2
Talk -In DAQ
Portable Coverage
Client Orange County, NC
Commission No. 20089A
Data Sources and Notes:
Tile number is labeled inside of tile.
Talk -In Samples - 705
Pass - 44.96
- Fail - DAQ < 3 (388)
- Pass - DAQ > =3 (317)
Design: GDM - 23 Oct, 2007
Drawn GDM - 23 Oct, 2007
Checked: RCB - 23 Oct, 2007
Approved. RCB - 23 Oct, 2007
File Name: M:\FILES\20089 Orange County RaCE\
20089A Coverage Testing \GIS\
Figure_02 Talk -In DAQ.mxd
Revised
CTA Communications
www.CTACommunications.com
+t (434) 239 -9200
®
..
......... .
�
A, J#,j
1�3ra r
rM
!zff
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1
Figure - B2
Talk -In DAQ
Portable Coverage
Client Orange County, NC
Commission No. 20089A
Data Sources and Notes:
Tile number is labeled inside of tile.
Talk -In Samples - 705
Pass - 44.96
- Fail - DAQ < 3 (388)
- Pass - DAQ > =3 (317)
Design: GDM - 23 Oct, 2007
Drawn GDM - 23 Oct, 2007
Checked: RCB - 23 Oct, 2007
Approved. RCB - 23 Oct, 2007
File Name: M:\FILES\20089 Orange County RaCE\
20089A Coverage Testing \GIS\
Figure_02 Talk -In DAQ.mxd
Revised
CTA Communications
www.CTACommunications.com
+t (434) 239 -9200
F►9ure - 63
Talk -Out pqQ
Portable Coverage
' client: Orange County, NC
Commission No. 20089A
""a S""" and Nme1""_�
Tile number is labeled inside of tile.
Talk -In SamPIes - 695
% Pass -67.19
- Fail - pq
-Q 3 (228)
Pass _
FAQ ' =3 (467)
2 =2077
ed:
ne: M; IFILEt3p0p89 Dmn
�g(re Coverage TesGn Count
8�e 03 -Talk 91GIS1YRaCE1
� -0ut DAQ1 ".
4 Communications
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tT u
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1
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77
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i
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Figure - B4
Camden RSSI
client: Orange County, NC
Commission No. 20089A
Data Sources and Notes:
Values are in dBm
• Red < -102
• Grey >_ -102 and 93 (Mobile)
• Green >= -93 (Portable)
Desgn:GDM - 23 Oct, 2007
Drawn: GDM - 23 Oct, 2007
Checked: RCB - 23 Oct, 2007
Approved: RCB - 23 Oct, 2007
File Name: M:\FILES\20089 Orange County Rai
20089A Coverage Testing \GIS\
Figure_04- Camden RSSI.mxd
Revised
CTA Communications
www.CTACommunications.com
+1 (434) 239 -9200
Li
i
_
I
}
CHATHAM -
`
r
lleg-,
r!
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z 1 -
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Figure - B4
Camden RSSI
client: Orange County, NC
Commission No. 20089A
Data Sources and Notes:
Values are in dBm
• Red < -102
• Grey >_ -102 and 93 (Mobile)
• Green >= -93 (Portable)
Desgn:GDM - 23 Oct, 2007
Drawn: GDM - 23 Oct, 2007
Checked: RCB - 23 Oct, 2007
Approved: RCB - 23 Oct, 2007
File Name: M:\FILES\20089 Orange County Rai
20089A Coverage Testing \GIS\
Figure_04- Camden RSSI.mxd
Revised
CTA Communications
www.CTACommunications.com
+1 (434) 239 -9200
° 3Mh am, =� 7 �''�V;y
1
��
Values are in dBm
•
Red < -102
•
�
•
Green >_ -93 (Portable)
T
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r
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ll
4 S
_ �
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r
/
34
g
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y
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7
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r
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- j r� ���
i �_•
i
i
i
x -
_
i
Figure - B5
Cane RSSI
Client: Orange County, NC
Commission No. 20089A
Data Sources and Notes:
Values are in dBm
•
Red < -102
•
Grey >_ -102 and < -93 (Mobile)
•
Green >_ -93 (Portable)
Design. GDM - 23 Oct, 2007
Drawn GDM - 23 Oct, 2007
Checked RCB - 23 Oct, 2007
Approved: RCB - 23 Oct, 2007
File Name: M'\FILES\20089 Orange County RaCE\
20089A Coverage Testing \GIS\
Figure_OSCane RSSI.mxd
Revised
CTA Communications
QNAAB��
W V E
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+1 (434) 239 -9200
Figure - B6
Chatham RSSI
Client Orange County, NC
Commission No. 20089A
Data Sources and Notes:
Values are in dBm
�
I
LAWS
Grey >= -102 and < -93 (Mobile)
•
Green >= -93 (Portable)
�
6Y
J
is
•. _,
r
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r
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Figure - B6
Chatham RSSI
Client Orange County, NC
Commission No. 20089A
Data Sources and Notes:
Values are in dBm
�
I
•
Grey >= -102 and < -93 (Mobile)
•
Green >= -93 (Portable)
�
r
r
r
apahaw
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y
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,
Figure - B6
Chatham RSSI
Client Orange County, NC
Commission No. 20089A
Data Sources and Notes:
Values are in dBm
•
Red —102
-102
•
Grey >= -102 and < -93 (Mobile)
•
Green >= -93 (Portable)
Design: GDM - 23 Oct, 2007
Drawn: GDM - 23 Oct, 2007
Checked: RCB - 23 Oct, 2007
Approved: RCB - 23 Oct, 2007
File Name: M:\FILES\20D89 Orange County RaCE\
20089A Coverage Testing\GIS\
Figure O6- Chatham RSSI.mxd
Revised
CTA Communications
www.CTACommunications.com
+1 (434) 239 -9200
/ � r
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Figure - B7
Cole Mill RSSI
client: Orange County, INC
Commission No. 20089A
Data Sources and Notes:
Values are in dBm
Red < -102
• Grey >= -102 and < -93 (Mobile)
• Green >_ -93 (Portable)
Design:GDM - 23 Oct, 2007
Drawn: GDM - 23 Oct, 2007
Checked: RCB - 23 Oct, 2007
Approved: RCB - 23 Oct, 2007
File Name: MAFILES\20089 Orange County RaCE\
20089A Coverage Testing \GIS\
Figure_07 -Cole RSSI.mxd
Revised
CTA Communications
/NAB
W�E
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+1 (434) 239 -9200
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Figure - B7
Cole Mill RSSI
client: Orange County, INC
Commission No. 20089A
Data Sources and Notes:
Values are in dBm
Red < -102
• Grey >= -102 and < -93 (Mobile)
• Green >_ -93 (Portable)
Design:GDM - 23 Oct, 2007
Drawn: GDM - 23 Oct, 2007
Checked: RCB - 23 Oct, 2007
Approved: RCB - 23 Oct, 2007
File Name: MAFILES\20089 Orange County RaCE\
20089A Coverage Testing \GIS\
Figure_07 -Cole RSSI.mxd
Revised
CTA Communications
/NAB
W�E
S www.CTACommunications.com
+1 (434) 239 -9200
Figure - B8
Hillsborough RSSI
client: Orange County, NC
Commission No. 20089A
Data Sources and Notes:
Values are in dBm
• Red<-102
• Grey >_ -102 and -93 (Mobile)
• Green — -93 (Portable)
Design:GDM - 23 Oct, 2007
Dram:-GDM - 23 Oct, 2007
Checked: RCB - 23 Oct, 2007
Approved: RCB - 23 Oct, 2007
File Name: M:\FILES\20089 Orange County RaCE\
20089A Coverage Testing\GIS\
FigureL08-Hills RSSI.mxd
Revised
CTA Communications
www.CTACommunications.com
+1 (434) 239-9200
ti
#LAWS
C
4.
f
t
I j
_Z-
+
4
-4!
0.,
Figure - B8
Hillsborough RSSI
client: Orange County, NC
Commission No. 20089A
Data Sources and Notes:
Values are in dBm
• Red<-102
• Grey >_ -102 and -93 (Mobile)
• Green — -93 (Portable)
Design:GDM - 23 Oct, 2007
Dram:-GDM - 23 Oct, 2007
Checked: RCB - 23 Oct, 2007
Approved: RCB - 23 Oct, 2007
File Name: M:\FILES\20089 Orange County RaCE\
20089A Coverage Testing\GIS\
FigureL08-Hills RSSI.mxd
Revised
CTA Communications
www.CTACommunications.com
+1 (434) 239-9200
Figure _ 139
Laws RSSI
' client. Orange County, NC
CenVn S.b, No. 20089q
Data
s,.rcea arb NWes:
Values are in dem
Red <_102
Grey >_ -102 and 1-93 (Mobile
Green x -93 (Portable) )
n:GDfvt -23
GDM _ 23 Oct, 2007
'a :M;IFILES120pggpray
20089A Coverage T County RaCEI
Figure 91GIS1
—09-La ws RSSI.mxd
a
Comm
unications
WWv. CTACommunicatjons,com
+1 (434) 239 -9200
Figure - B10
UNC RSSI
client: Orange County, NC
Commission No. 20089A
Data Sources and Notes:
_.LAWS
•
Red<-102
•
Grey >=-102 and <-93 (Mobile)
•
Green — -93 (Portable)
•
J
haii
2A I
4
t
11 IIH 1
jj, p
-Y"
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15
T
j
Figure - B10
UNC RSSI
client: Orange County, NC
Commission No. 20089A
Data Sources and Notes:
Values are in dBm
•
Red<-102
•
Grey >=-102 and <-93 (Mobile)
•
Green — -93 (Portable)
haii
2A I
-Y"
' Ix
15
T
j
x
CHATHAM-
7j
6
Figure - B10
UNC RSSI
client: Orange County, NC
Commission No. 20089A
Data Sources and Notes:
Values are in dBm
•
Red<-102
•
Grey >=-102 and <-93 (Mobile)
•
Green — -93 (Portable)
Design: GDIVI - 23 Oct, 2007
Dram: GDM - 23 Oct, 2007
Checked: RCS - 23 Oct, 2007
Approved: RCB - 23 Oct, 2007
File Name: MAIFI LES\20D89 Orange County RaCE\
20089A Coverage Tesfing\GIS\
Figure._10-UNC RSSI.mxd
Revise
CTA Communications
www.CTACommunications.com
+1 (434) 239-9200
Figure - B11
BEST SERVER RSSI
client: Orange County, NC
Commission No. 20089A
Data Sources and Notes
Values are in dBm
0 Red < -102
• Grey >= -102 and < -93 (Mobile)
• Green >_ -93 (Portable)
RSSI:
Minimum -107
Mawmum -49
Mean -83
Median -84
Design:GDM - 23 Oct, 2007
Drawn: GDM - 23 Oct, 2007
Checked: RCB - 23 Oct, 2007
Approved: RCB - 23 Oct, 2007
File Name: MAFILES\20089 Orange County RaCE\
20089A Coverage Testing\GIS\
Figure_11 -BEST SERVER RSSI.mxd
Revised:
CTA Communications
jjNNApp,
WQ�( �E
���5 www.CTACommunications.com
+1 (434) 239 -9200
i
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,
Figure - B11
BEST SERVER RSSI
client: Orange County, NC
Commission No. 20089A
Data Sources and Notes
Values are in dBm
0 Red < -102
• Grey >= -102 and < -93 (Mobile)
• Green >_ -93 (Portable)
RSSI:
Minimum -107
Mawmum -49
Mean -83
Median -84
Design:GDM - 23 Oct, 2007
Drawn: GDM - 23 Oct, 2007
Checked: RCB - 23 Oct, 2007
Approved: RCB - 23 Oct, 2007
File Name: MAFILES\20089 Orange County RaCE\
20089A Coverage Testing\GIS\
Figure_11 -BEST SERVER RSSI.mxd
Revised:
CTA Communications
jjNNApp,
WQ�( �E
���5 www.CTACommunications.com
+1 (434) 239 -9200
r ,
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i
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87 �Zdpahea
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Figure - B11
BEST SERVER RSSI
client: Orange County, NC
Commission No. 20089A
Data Sources and Notes
Values are in dBm
0 Red < -102
• Grey >= -102 and < -93 (Mobile)
• Green >_ -93 (Portable)
RSSI:
Minimum -107
Mawmum -49
Mean -83
Median -84
Design:GDM - 23 Oct, 2007
Drawn: GDM - 23 Oct, 2007
Checked: RCB - 23 Oct, 2007
Approved: RCB - 23 Oct, 2007
File Name: MAFILES\20089 Orange County RaCE\
20089A Coverage Testing\GIS\
Figure_11 -BEST SERVER RSSI.mxd
Revised:
CTA Communications
jjNNApp,
WQ�( �E
���5 www.CTACommunications.com
+1 (434) 239 -9200
LAWS }
Jam. I' y I 1 1 •� 1 X' �,
I1 I F.
I
i
!
1
t _ r
CANE
1 1
!1
r a.
1 t
■ Miles
16
! T
I
I
I
!
I
I
1 1 s
, - sa,
it
Ealeigh;,
Figure - B12
BEST SERVER SITE
client: Orange County, INC
Commission No. 20089A
Data Sources and Notes:
*
Camden (41)
Cane (70)
#
Chatham (184)
Cole Mill (62)
"
Hillsborough (384)
Laws (173)
UNC (142)
Design:GDM - 23 Oct, 2007
Drawn: GDM - 23 Oct, 2007
Checked: RCB - 23 Oct, 2007
Approved: RCB - 23 Oct, 2007
File Name:
M:\FILES\20089 Orange County RaCE\
20089A Coverage Testing \GIS\
Figure 12 -BEST SERVER SITE ZOOM OUT.mxd
Revised
CTA Communications
www.CTACommunications.com
+1 (434) 239 -9200
BST_SRVR
1
2
�3
�4
5
�6
0 7
AFILIATED
- 3
- 4
5
- 6
10 1.5 3
6
� Miles
9 12
LAWS
JIM ,
COLE MILL
A
Figure - B13
Best Server and
Affiliated Sites
Client: Orange County, NC
Commission No. 20089A
The color of the file border depicts the site
with the strongest RSSI, or Best Server.
The color inside of the the depicts the site
that the radio was affiliated with for the Talk -In
Camden
• Cane
• Chatham
• Cole Mill
Hillsborough
• Laws
• UNC
Desgn:GDM - 23 Oct, 2007
Drawn: GDM - 23 Oct, 2007
Checked: RCB - 23 Oct, 2007
Approved: RCB - 23 Oct, 2007
File Name: M:\FILES\20089 Orange County RaCE\
20089A Coverage Testing \GIS\
Figure_13 -Best Server Affiliation.mxd
Revised
CTA Communications
N
W�E
S www.CTACommunications.com
+1 (434) 239 -9200