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Orange County NC RaCEsm Results
November 9, 2007 CTA Communications ...providing innovative and reliable solutions for the future GT unicatins Table Of Contents Orange RaCE Test Report 1.0 Introduction .............................................:................_.................---.............................................3 1.1 Purpose .................................................................................................:................................................... .............3 2.0 Results ....................................................................:....................................................... ...........4 2.1 Test Data .................................................................................................................................................. ............. 4 2.2 Derived Coverage Maps ........................................................................................................................... ............. 4 3.0 Summary Of Testing And Conclusions Reached ............................................................ ...........6 3.1 Talk-In DAQ ................................................................................................................................................:.... .............6 3.2 Talk-Out DAQ ..................................................................................................._............................................. ............. 6 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 ......................................................................................................13 6.1 The RaCE Test Set ................................................................................................................................... ...........13 Figure 6-1 RaCE Test Setup ......................................................................................................................... ...........14 Table 6-1 RaCE Stationary Location Equipment .......................................................................................... ...........14 Table 6-2 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 ................................................................................................................................... ........... 21 7.2 Geographic Areas and Sites Tested ......................................................................................................... ...........22 7.3 Monitored Frequencies ............................................................................................................................. ........... 22 Table 7.1 Viper Radio Frequencies .............................................................................................................. ...........22 Appendix A Setup Procedures .............................................................................................. ........24 A.1 Pre-Ship Procedures ................................................................................................................................ ...:.......24 A.2 Post-Ship Procedures ........................................................................................................:...................... ...:.......24 CTA C®munications Orange RaCE Test Report A.3 Pre-Test Procedures ............................................................................................................................................25 A.4 Conclusion of each Day of Testing ......................................................................................................................25 A.5 Prolonged Interruptions .......................................................................................................................................25 A.6 Conclusion of Final Testing .................................................................................................................................25 Appendix B Coverage Maps ..........................................................................................................26 CTA COm UniCatins Orange RaCE Test Report 1.0 Introduction Radio system coverage conformance testing is defined by three performance criteria: channel performance cri#erion (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. -3- t^o unications 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 rid reference and Test Direction. MOBILE DAQ - The Delivered Audio Quality score on the mobile unit. STATIONARY DAQ The Delivered Audio Quality score on the - stationa 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-iri 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 IOS Details directory in the final result CD. o FIGURE B-2-talk-in DAO for ahip-mounted portable -Grid results for the talk-in (Mobile to Base) test. o FIGURE B-3-talk-out DAQ for ahip-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 i - 4 - t-iJ~i'~1 C +~ munications Orange RaCE Test Report 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. COI"111f1'1UI~ICa~lOi1S Orange RaCE Test Report 3.0 Summary Of Testing And Conclusions Reached 3.1 Talk-In DAQ The Talk-In DAO 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 reliabilityfor 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 DAO 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. -6- HSM~~ .. - T COt1'tl'1'tU111Ca~lOt1S Orange RaCE Test Report 34 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. -7- t-I~M'~t ' ,~~ i TA Cn't Unicati®ns 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 chalice of successful communication is realized and that these changes result in performance levels that will satisfy Orange County coverage requirements. -8- i CTA Com unica#iolns Orange RaCE Test Report 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 Qualit Definitions ~- ., ..~ -~- 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 d6 DAQ-3 Speech understandable with slight effort; occasional repetition required due to noise and distortion; SINAD equivalent intelli ibili 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 4. TA Co unictions Orange RaCE Test Report 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 defned 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 apre-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 C unications Orange RaCE Test Report and then initiates stalk-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 ih 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 DAO 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 fZ 3 fz9 * f, 2 ~ ~, f, 10 ? fZ 2 ~ ~. f210 ••• I I I I I••• 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. - 11 - $-tiv1'~ .; ..~ CTA Communications Orange RaCE Test Report 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. -12- ~as~~~ , Com unictions 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 GPS 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 awide-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. CTA Co munica#ions Orange RaCE Test Report Figure 6-1 RaCE Test Setup _ ~ ~ ~ ~ I 1 l 1 I 1 I { _ ~ ~ ~~~ I 1 ~ ! r- -~ ~ ~ .~~ ~ ~ ~ __,- I 1 L=.~~.-~ J' i ,~.. I' ~ ~ ` _ 1 1 ~~ I I I l i ~ e~ ~. F~xEo S j I I ~ I ~ ~~ I [ _~ N Table 6- 1 RaCE Stationa ry Location Equipment RaCE Stationary unit N/A CTA S 003 Computer Type IBM T-60 Lenovo L3-LTW94 07/03 RaCE 7 RaCE Software Version 2.14 CTA N/A Test Radio (Orange XTL-5000 Motorola 500CFR0148 Coun Provided Antenna 0 d6 Gain . - N/A N/A Radio RF Power Output: . 24.5 W Antenna Location: Inside hotel room on top of refrigerator Notes: -14- T ol't'tirl't111catlotlS Orange RaCE Test Report Table 6-2 RaCE Mo bile Location Equ ipment RaCE Mobile Unit N/A CTA M 003 Computer Type IBM T-60 Lenovo L3-FVC 65 07/03 RaCE 6 RaCE Software 2.14 CTA N/A Version Test Radio (Orange XTL-5000 Motorola 500CFR0147 Coun Provided Antenna (All 0 d6 Gain N/A N/A Radios. RSSI Receiver #1 IC-PCR 1500 ICOM 1001037 RSSI Receiver #2 (NOT USED) Test Vehicle Type Mini Van, 2005 Dodge (Big White) .. - Test Radio RF Power 25.5 W Out ut: Antenna Location Front Roof Center 6.2 The RaCE Test Sequence When a test sequence occurs, the mobile unit transmits apre-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. -15- T C unica#ior1S Orange RaCE Test Report Table 6-3 RSSI 8 Attenuation Accuracy Verification Type: Ramsey Com-3010 Serial Number: 408094 Date 13 August, 2007 Calibrated: Next Cal Due 13 February, 2008 Date: Notes: 6.4 DAQ Testing Attenuation Equipment 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 avehicle-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. -16- CTA C®imunications 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 6-4 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 d6 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. Mobile Unit Talk-Out Correction 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 r Portable Receive -119.0 dB -119.0 dB Sensitivity Difference -0 d6 9.0 dB 0.0 d6 1.9 d6 0.6 d6 _ 2.5 dB Antenna System Loss Difference 6.5 dB Total Talk-Out Correction Attenuation 6.5 d6 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 CTA Co munications Orange RaCE Test Report i anie b-5 moose unit i aiic-m correction For Portable Receive Transmit Power Mobile (25 Watts) 44.0 dBm Portable (3 Watts) 34.8 dBm Transmit Power Difference 9.2 dB Antenna System Losses Portable Talk-In Antenna System Total for At the Hip 9 dB Mobile Talk-In Antenna System 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 O.ti d6 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. CIRCU~ATCJR 6 d6 TFZ~NSCEI1t~ER C CO Uf11C~#I t]S 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. Avery 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. -19- CTA Co unications Orange RaCE Test Report 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. CTA Communications Orange RaCE Test Report 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 apost-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 DAO 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 - NS1yIM ,~~¢..~. ~~ TA C4 municatins 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. Table 7-1 1 CAMDEN Viper Radio WC Frequencies ~ w 821600000 866600000 1 CAMDEN WC 822412500 867412500 1 CAMDEN WC 822912500 867912500 1 CAMDEN WC 823587500 868587500 1 CAMDEN 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 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 821275000. 866275000 4 COLE MILL WC 821987500 866987500 4 COLE MILL WC 822275000 867275000 4 COLE MILL WC 822775000 867775000 C unica#ions Orange RaCE Test Report 4 COLE MILL CC 823775000 868775000 5 HILLSBOROUGH WC 821175000 866175000 5 HILLSBOROUGH WC 821450000 866450000 5 HILLSBOROUGH WC 821775000 866775000 5 HILLSBOROUGH WC 822337500 867337500 5 HILLSBOROUGH WC 822712500 867712500 5 HILLSBOROUGH WC 823312500 868312500 5 HILLSBOROUGH WC 823525000 868525000 5 HILLSBOROUGH CC 823712500 868712500 6 LAWS WC 821112500 866112500 6 LAWS' WC 821475000 866475000 6 LAWS WC 822050000 867050000 6 LAWS WC 822562500 867562500 6 LAWS CC 823850000 868850000 7 UNC WC 821075000 866075000 7 UNC WC 821387500 866387500 7 UNC WC 821712500 866712500 7 UNC WC 822162500 867162500 7 UNC WC 822487500 867487500 7 UNC WC 822987500 867987500 7 UNC WC 823387500 868387500 7 UNC CC 823825000 868825000 CTA Comuniicatiions 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. C un%cations 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. A.4 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. i Communications Orange RaCE Test Report Appendix. B Coverage Maps N o W ~ J ~ ~ O H C O ~ O J ~ N ~ U m ~~~~(( r ICJ O U' V v o, ~ V j Cam') E N m ~~ ^ o m. ~ H o ~ U ~ O ~ 0 ° ~ ~ rn~ b ~ ~ r 2 ~~ o o i am _ + _ T ~ ~>Q `= o ._ = _ o o O. TS ° ~ OO ~ ~ 25z O ~ ~L U N Z M f") N N ~ W ~ ¢ 5 Z ,Q N N ~ ~ J 0 i N W h ~ ~ C.~ ~ ~ N W. p .E U C7 ~ 8i E U ^ U U N ~ ~ 'n m x d 2 n z ~ ~ O ~ O U Q I~ ~ +~ _ x~ L ..,. z .~ ,' ` l6 ' Y ` ~,~. ~ F' y ~~ .,....v 'i C _ 4 r ~ CJ -: ~ ~ '~ _ ~ ~ ~ a r ,~ - . i 'y~ ,. i0 ~~ ~ ~ ~ # * ~ ~, `iM~ttAl~ MGM' ~~~ ~~ 4 ~ ~ ~ ~ ~~ ~~~ ~ +~~ ~ ~e ~ ~ ~~~ ~ ~.. ~~ i~ '+~""~~' _. ~+-i~ * :..~. "`s 'mom .... -+~r ~ * _ ~ ~ ,~ ., _ s w,. +h. 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