ATH2422001-1Repeater

1-1 October 1995 Part No. 001-2008-202 VIKING ® VX VHF LTR 25W-110W Repeater Part No. 242-20X1-213 First Printing August 2000 PRELIMINARY 1-2 October 1995 Part No. 001-2008-202 1-3 October 1995 Part No. 001-2008-202 VIKING ® VX VHF LTR REPEATER PART NO. 242-20X1-213 Copyright 2000 by the E.F. Johnson Company The E.F. Johnson Company designs and manufactures two-way radio equipment to serve a wide variety of communications needs. Johnson produces equipment for the mobile telephone and land mobile radio services which include business, indus- trial, government, public safety, and personal users. LAND MOBILE PRODUCT WARRANTY The manufacturer’s warranty statement for this product is available from your product supplier or from the E.F. Johnson Com- pany, 299 Johnson Avenue, Box 1249, Waseca, MN 56093-0514. Phone (507) 835-6222. WARNING This device complies with Part 15 of the FCC rules. Operation is subject to the condition that this device does not cause harm- ful interference. In addition, changes or modification to this equipment not expressly approved by E. F. Johnson could void the user’s authority to operate this equipment (FCC rules, 47CFR Part 15.19). DO NOT allow the antenna to touch or come in very close proximity with the eyes, face, or any exposed body parts while the radio is transmitting. To comply with FCC RF exposure limits, DO NOT operate the transmitter of a stationary radio (base station or marine radio) when a per son is within four (4) meters of the antenna. DO NOT operate the radio in explosive or flammable atmospheres. The transmitted radio energy could trigger blasting caps or cause an explosion. DO NOT operate the radio without the proper antenna installed. DO NOT allow children to operate transmitter equipped radio equipment. NOTE: The above warning list is not intended to include all hazards that may be encountered when using this radio. SAFETY INFORMATION The FCC has adopted a safety standard for human exposure to RF energy. Proper operation of this radio under normal conditions results in user exposure to RF energy below the Occupational Safety and Health Act and Federal Communication Commission limits. The information in this document is subject to change without notice. E.F. Johnson Company will not be liable for any misunderstanding due to misinformation or errors found in this document. LTR, LTR-Net, Multi-Net, Viking Head/EFJohnson Logo, Call Guard and SUMMIT are registered trademarks of E.F. Johnson Company All other company and/or product names used in this manual are trademarks and/or registered trademarks of their respective manufacturer. 1-4 October 1995 Part No. 001-2008-202 FCC EXPOSURE LIMITS This fixed station radio transceiver was tested by the manufacturer with an appropriate antenna in order to verify compliance with Maximum Permissible Exposure (MPE) limits set under Section 2.1091 of the FCC Rules and Regulations. The guide- lines used in the evaluation are derived from Table 1 (B) titled “Limits For General Population/Uncontrolled Exposure” which is from FCC report OET bulletin #65. Table 2 lists the antennas recommended for use in the VHF frequency range. Each model of this radio was tested with the appropriate antenna listed. The antenna shall be mounted to a tower and be a minimum of 10 meters above the ground at the lowest point on the antenna. The radio manufacturer has determined that the user and ser vice per sonnel should remain four (4) meters in distance away from the antenna when transmitting. By maintaining this distance, these individuals are not exposed to radio frequency energy or magnetic fields in excess of the guidelines set forth in Table 1 (B). NOTE: Other antennas or installation configurations that have not been tested may not comply with FCC RF exposure limits and therefore are not recommended. Ta b l e 1 ( B ) FCC Limits for Maximum Permissible Exposure (MPE) (B) Limits For General Population/Uncontrolled Exposure Frequency Range (MHz) Electric Field Strength (E) (V/m) Magnetic Field Strength (H) (A/m) Power Density (S) (mW/cm 2 ) 0.3 - 1.346141.63(100)* 1.34 - 30 824/f 2.19/f (180/f 2 )* 30 - 30027.50.0730.2 300 - 1500----f/1500 1500 - 100,000----1.0 f = Frequency in MHz *Plane-wave equivalent power densit y. Ta b l e 2 Recommended Antennas (Antenna Manufacturer - Decibel Products) FrequencyAntenna Model No. 132-144 MHzDB205E 144-178 MHzDB205F TABLE OF CONTENTS 1 1INTRODUCTION AND OPERATION 1.1SCOPE OF MANUAL. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-1 1.2REPEATER DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-1 1.3REPEATER IDENTIFICATION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-1 1.4MODEL NUMBER BREAKDOWN. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-1 1.5ACCESSORIES. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-1 1.6PRODUCT WARRANTY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-2 1.7FACTORY CUSTOMER SERVICE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-2 1.8FACTORY RETURNS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-2 1.9REPLACEMENT PARTS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-3 1.10 SOFTWARE UPDATES/REVISIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . …

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3 Figure 1 EXCITER BLOCK DIAGRAM SYNTHESIZER The synthesizer inputs/outputs are shown in Figure 1. The synthesizer output signal is the transmit frequency. This signal is produced by a VCO (voltage-controller oscillator) that is frequency controlled by a DC voltage pro- duced by synthesizer chip U403. This DC voltage is filtered by a loop filter made up of C805, C806 and R804 in the VCO circuitry. Frequencies are selected by programming counters in U403 to divide by a certain number. This programming is provided through J401, pins 12, 19 and 20. The frequency stability of the synthesizer is established by the ±1.0 PPM stability of TCXO Y401. This oscillator is stable from -30°C to +60°C (-22°F to +140°F). The VCO frequency of A007 is controlled by a DC voltage produced by the phase detector in U403. The phase detector senses the phase and frequency of the two input signals and causes the VCO control voltage to increase or decrease if they are not the same. When the frequencies are the same, the VCO is then “locked” on fre- quency. The synthesizer contains the R (reference), N, and A counters, phase and lock detectors and counter program- ming circuitry. One input signal to the phase detector in U403 is the reference frequency (f R). This frequency is the 17.5 MHz TCXO frequency divided by the reference counter to the frequency step or 6.25 kHz. The other input signal (f V) is the VCO frequency divided by the “N” counter in U403. The counters are programmed through the synthesizer data line on J401, pin 20. Each channel is programmed by a divide number so that the phase detector input is iden- tical to the reference frequency (f R) when the VCO is locked on the correct frequency. Frequencies are selected by programming the three counters in U403 to divide by assigned numbers. The pro- gramming of these counters is performed by circuitry in the Main Processor Card (MPC), buffered and latched through the Interface Alarm Card (IAC) and fed into the synthesizer on J401, pin 20 to Data input port U403, pin 19. BUFFER SYNTHESIZER DATA CLK BUFFER VCO CHARGE PUMP BUFFER SYN CS EX SYN LK EX U403 Q406/Q407 U404B BUFFER Q410/Q411Q413 AMP Q405 Q403/Q404 BUFFER Y401 TCXO U404A U402AU402B EX MOD LPTT SWITCH TO PAA007 AMP AMP U407B V REF EX PD OUT RF IN REF IN Q414/Q415V R Q416/Q417 4 Data is loaded into U403 serially on the Data input port U403, pin 19 when U403, pin 17 is low. Data is clocked into the shift registers a bit at a time by a low to high transition on the Clock input port U403, pin 18. The Clock pulses come from the MPC via the IAC to J401, pin 19. As previously stated, the counter divide numbers are chosen so that when the VCO is operating on the correct frequency, the VCO-derived input to the phase detector (f V) is the same frequency as the TCXO-derived input (fR). The f R input is produced by dividing the 17.5 MHz TCXO frequency by 2800. This produces a reference frequency (f R) of 6.25 kHz. Since the VCO is on frequency and no multiplication is used, the frequencies are changed in 6.25 kHz steps. The reference frequency is 6.25 kHz for all frequencies selected by this Exciter. The f V input is produced by dividing the VCO frequency using the prescaler and N counter in U403. The pres- caler divides by 64 or 65. The divide number of the prescaler is controlled by the N and A counters in U403. The N and A counters function as follows: Both the N and A counters begin counting down from their programmed number. When the A counter reaches zero, it halts until the N counter reaches zero. Both counters then reset and the cycle repeats. The A counter is always programmed with a smaller number than the N counter. While the A counter is counting down, the pres- caler divides by 65. Then when the A counter is halted, the prescaler divides by 64. Example: To illustrate the operation of these counters, assume a transmit frequency of 150.250 MHz. Since the VCO is the channel frequency for transmit this frequency is used. To produce this frequency, the N and A counters are programmed as follows: N = 375A = 40 To determine the overall divide number of the prescaler and N counter, the number of VCO output pulses required to produce one N counter output pulse can be counted. In this example, the prescaler divides by 65 for 65 x 40 or 2,600 input pulses. It then divides by 64 for 64 x (375 - 40) or 21,440 input pulses. The overall divide num- ber K is therefore (21,440 + 2,600) or 24,040. The VCO frequency of 150.250 MHz divided by 24,040 equals 6.25 kHz which is the f R input to the phase detector. The overall divide number K can also be determined by the follow- ing formula: K = 64N + A Where, N = N counter divide number and A = A counter divide number. BUFFER AMPLIFIER A cascode amplifier formed by Q403 and Q404 provides amplification and isolation between the TCXO and Synthesizer U403. A cascode amplifier is used because it provides high gain, high reverse isolation and consumes only a small amount of power. The input signal to this amplifier is coupled from TCXO Y401, pin 5 by C420. C420 also provides DC blocking. Bias for the amplifier is provided by R430, R431, R432, R433 and R428. L402 is an RF choke. RF bypass is provided by C416, C418 and C419. The output of Q403/Q404 is coupled to U403, pin 20 by C417. 5 BUFFER AMPLIFIER A cascode amplifier formed by Q406 and Q407 provides amplification and also isolation between the VCO and Synthesizer U403. A cascode amplifier is used because it provides high gain, high isolation and consumes only a small amount of power. The input signal to this amplifier is coupled from VCO A007, pin 6 by C433. C433 also provides DC blocking. Bias for the amplifier is provided by R450, R451, R453, R454 and R455. L403 is an RF choke. RF bypass is provided by C430, C431 and C479. The output of Q406/Q407 is coupled to U403, pin 11 by a non-polarized capacitor formed by C429/C499. LOCK DETECT When the synthesizer is locked on frequency, the Lock Detect output on U403, pin 2 is…

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EXCITER BLOCK DIAGRAM POWER AMPLIFIER BLOCK DIAGRAM BUFFER SYNTHESIZER DATA CLK BUFFER VCO CHARGE PUMP BUFFER SYN CS EX SYN LK EX U403 Q406/Q407 U404B BUFFER Q410/Q411Q413 AMP Q405 Q403/Q404 BUFFER Y401 TCXO U404A U402AU402B EX MOD LPTT SWITCH TO PAA007 AMP AMP U407BV REF EX PD OUT RF IN REF IN Q414/Q415 V R Q416/Q417 POWER CONTROL DRIVER CURRENT FINAL 1 CURRENT FINAL 2 CURRENT MPERATURE SENSOR Q501 PRE-DRIVER U501 DRIVER RF IN U503 Q502 FINAL 1 FINAL 2 Q503 U504 AMP TEMP SENSE U507U506A U502 U509 U601A/B FORWARD POWER U651A/B REVERSE (REFLECTED) POWER LPFRF OUTPUT RF LO

1 Circuit Description GENERAL The repeater facilities communication between one station to another. It receives a relatively week signal on an assigned frequency in the 132 to 178 MHz band, demodulates the signal to baseband, and retransmits baseband information at a selected level between 25 to 125W on the assigned transmitter VHF frequency between 132 and 178 MHz. The level adjustment is continuous within the 25 to 125W range. In normal operation, no external controls for setting transmitter power and frequency are available to an oper- ator. Only manufacturer, installation or maintenance personnel can make or change these settings using a personal computer and custom software which are not a part of the operating equipment. The transmitter subsystem consists of three assemblies. They are the exciter, the high power amplifier and the RF interface. The exciter is at the head of the transmitter RF chain, and it generates a low level of FM signal that is at the fundamental frequency of the transmitter. The high power amplifier boosts the level of the signal produced by the exciter to a selected, controlled level between 25 and 125W. The RF interface assembly provides an inter- face between the transmitter and the power, modulation, monitor and control functions of the repeater. The exciter generates a frequency modulated signal at the fundamental transmitter frequency with an output level required to drive the high power amplifier. To generate the fundamental transmitter frequency, the exciter incorporates phase lock technology to control the stability of the internal voltage oscillator, VCO, with a very sta- ble reference signal from an internal temperature compensated crystal controlled oscillator, TCXO. The synthe- sizer produces an output signal at the assigned transmitter frequency. A voltage-controlled oscillator, VCO, operat- ing at the fundamental transmitter frequency produces this signal. A phase locked loop, PLL, controls and stabilizes the VCO frequency and locks it to the frequency of a high stability signal derived from a TCXO of 1.0 PPM located in the exciter assembly. To suppress frequency pulling during transmission, the exciter isolates the frequency determining circuit from the rest of the transmitter chain with RF buffer amplifiers. Multilevel voltage regulation isolates the frequency determining circuits from disturbances produced at the primary power source. As a part of the multilevel regulation strategy, the exciter provides internal regulation of critical voltage to ensure frequency stability and noise immunity from external noise sources. When turning on the repeater, the processor on the main processor card, MPC, down loads the prepro- grammed frequency information to the synthesizer integrated circuit, IC, located in the exciter. The synthesizer stores its respective frequency programming information in an internal register. Normally, there is no further update of the stored information. If the synthesizer becomes unlocked, it sends a signal to the MPC which turns off transmission to prevent interference with other channels. 2 EXCITER VCO The Voltage-Controlled Oscillator (VCO) is formed by Q101, associated circuitry and High-Q indicator L102. The VCO oscillates in a frequency range from 132-178 MHz. Biasing of Q101 is provided by R102, R103 and R104. An AC voltage divider formed by C107 and C108 initiates and maintains oscillation. C106 couples Q101 to the High-Q inductor. RF choke L103 completes the DC bias path to ground. The VCO frequency is controlled in part by DC voltage across varactor diode D101. As voltage across a reverse-biased varactor diode increases, its capacitance decreases. Therefore, VCO frequency increases as the con- trol voltage increases. The control line is RF isolated from tank circuit by choke L101. The amount of frequency change produced by D101 is controlled by series capacitor C102. The frequency is modulated in a similar manner. The transmit audio/data signal is applied across varactor diode D102 to vary the VCO frequency at an audio rate. C104/C105 in series with D102 determine the amount of modulation produced by the audio signal. VCO BUFFER Q102/Q103 form a cascade-connected buffer circuitry. DC bias is produced by R107, R108, R109 and R1212. A signal oscillated at Q101 is DC cut and adjusted by C107 and fed into the buffer. An output from RF choke L104 passes through an adjustment circuit consisting of C114/C119. VCO/TCXO FREQUENCY MODULATION Both the VCO and TCXO are modulated in order to achieve the required frequency response. If only the VCO was modulated, the phase detector in U403 would sense the frequency change and increase or decrease the VCO control voltage to counteract the change (at the lower audio frequencies inside the closed loop bandwidth of the synthesizer). If only the TCXO frequency was modulated, the VCO would not track the higher audio frequencies (those beyond the closed loop bandwidth of the synthesizer). However, by modulating both the VCO and TCXO a flat audio response is achieved. Potentiometers RV101 and RV401 balance the modulating signals. There are two 3.5V sources on the Exciter board; one is a reference for the modulation amplifier to the VCO, the other is for the modulation amplifier to the TCXO. The reference voltage on U402B, pin 5 is also on buffer U407B, pin 5 to J401, pin 9 and RFIB connector J102, pin 9. The voltage leaves the RFIB on J101, pin 14 to J2, pin 27 on the backplane, to the bottom connectors via pin 7 and finally to the TPI on P100, pin 7. With reference to the ground on the Exciter, the 3.5V reference stability is maintained by U126B/C/D on the TPI. The 3.5V DC passes through summing amplifier U129B and transmit modulation gate U118D to P100, pin 29 (Tx MOD). P100, pin 29 is connected to backplane connector J2, pin 8 and RFIB connector J101, pin 22 to J102, pin 13. The transmit modulation and 3.5V reference enter the Exciter on J401, pin 13 and are routed to U402B, pin 6. RV1…

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15 Active Devices DesignatorVendor Part NumberFunction EXCITER CR401RD9.1ML9.1V zener CR402RD5.1ML B25.1V zener CR403RD5.1ML B25.1V zener Q 4032SC3356NPN TCXO buffer SOT-23 Q 4042SC3356NPN TCXO buffer SOT-23 Q 4052SB624PNP Switch SOT-23 Q 4062SC3356NPN VCO buffer SOT-23 Q 4072SC3356NPN VCO buffer SOT-23 Q 4102SC3356NPN buffer SOT-23 Q 4112SC3356NPN buffer SOT-23 Q 4122SC3357NPN amplifier SOT-89 Q 4132SC3357NPN amplifier SOT-89 U 402NJM2904IC mod amp/buffer U 403MC145190FIC synthesizer U 404NJM2904IC mod amp/buffer U 405NJM78L05+5V regulator U 406NJM78L12+12V regulator U 407NJM2904MIC voltage reference 16 DesignatorVendor Part NumberFunction TRANSMIT VCO D 101HVU202AVariable cap D 102HVU202AVariable cap Q 1012SC3356NPN oscillator SOT-23 Q 1022SC3356NPN buffer SOT-23 Q 1032SC3356NPN buffer SOT-23 Q 1042SC2712NPN active filter SOT-23 TCXO Y401EFJ 17.5MHz TCXO1PPM TCXO Q403MMBT3904L-T1Buffer Q404MMBT3904L-T1Buffer POWER AMPLIFIER CR501RF6.2MB26.2V zener CR502RF6.2MB26.2V zener Q 5012SK2973Pre-driver Q 502MRF275LFinal amplifier Q 503MRF275LFinal amplifier U 501M57719LDriver 17 DesignatorVendor Part NumberFunction U 502TA78L08F+8V regulator U 503MAX472ESACurrent sensor U 504MAX472ESACurrent sensor U 50578L05+5V regulator U 507LM35DTemperature sensor U 508NJM2904MDC amplifier U 509MAX472ESACurrent sensor DETECTOR CR6011SS306Detector CR6511SS306Detector U 601NJM2904MDC amplifier SO-8 U 651NJM2904MDC amplifier SO-8 U 653NJM78L05+5V regulator 78L05

8 ALIGNMENT EXCITER Refer to Figure 3 for component locations. Refer to Figure 6 for equipment needed and setup dia- gram. Select “EXCITER” from the “TEST” menu in the repeater software. Pretest 1.Set TCXO modulation adjust RV101 fully counterclockwise. 2.Connect the power meter to J402. Figure 3 EXCITER ALIGNMENT POINTS DIAGRAM TP MOD TP CNTRL Q411 Q410 Q407 Q406 A007 U406 Y401 RV401 U404 Q413 Q412 U407 1 U402 RV101 U405 1 2 20 19 J401 J402 Q417 Q415 Q414 Q416 Q404 Q403 U403 3 TP1 6 9 Voltage Measurements Apply power to the Exciter by plugging the 20-pin cable from the RF Interface Board into J401. Measure the voltages at the following pins. U406, pin 1+12V DC
0.4V U405, pin 1+5V DC
0.3V U402, pin 1+3.5V DC
0.1V U404, pin 7 +3.5V DC
0.1V PROGRAM TUNE-UP CHANNEL 1.For Exciters operating between: 138-144 MHz or 154-172 MHz. a.Using the PC and software, program the Synthesizer for the Transmit frequency. b.Press the space bar to key the Exciter. c.Tune the VCO capacitor L102 for +4.5V DC
0.05V at TP1 (U403, pin 6). Increase the transmit frequency by 3 MHz. The voltage on TP1 shall be less than 7.5V. Decrease the transmit frequency by 3 MHz. The voltage on TP1 shall be greater than 2V. d.Measure the Power Output of the Exciter at J402. Reading should be > +18 dBm. e.Press the space bar to unkey the Exciter. 2.For Transmitters operating within 6 MHz of the top of the transmit band (144-150 or 172-178 MHz). a.Program the Synthesizer for the Highest transmit frequency (i.e. 150 or 178 MHz). b.Press the space bar to key the Exciter. c.Set the control line voltage for 7.5V at TP1. Check 6 MHz below the programmed frequency (i.e. 144 or 172 MHz) to verify that the control voltage at TP1 is greater than 2V. The repeater Exciter can now be programmed for the desired operating frequency. d.Press the space bar to unkey the Exciter. 5.For Transmitters operating within 6 MHz of the bottom of the transmit band (132-138 or 150-156 MHz). a.Program the Synthesizer for the Lowest transmit frequency (i.e. 132 or 150 MHz). b.Set the control line voltage for 2V at TP1. Check 6 MHz above the programmed frequency (i.e. 138 or 156 MHz) to verify that the control voltage at TP1 is less than 7.5V. The repeater Exciter can now be programmed for the desired operating frequency. 10 VCO TEST 1. The software programs the synthesizer for 3 MHz above the Tune-Up frequency. Press the space bar to key the Exciter. The voltage on U403, pin 6 should be < 7V. Power output should be > +18 dBm. Press the space bar to unkey the Exciter. 2.The software programs the synthesizer for 3 MHz below the Tune-Up frequency. Press the space bar to key the Exciter. The voltage on U403, pin 6 should be > 2.5V. Power output should be > +18 dBm. Press the space bar to unkey the Exciter. 3.The software programs the synthesizer for the Transmit Channel. TCXO FREQUENCY ADJUST 1.Connect a 10 dB pad and frequency counter to J402. 2.Press the space bar to key the Exciter. 3.Tune TCXO Y401 for the Transmit Channel Frequency,
50 Hz. 4.Press the space bar to unkey the Exciter. TRANSMIT MODULATION ADJUST 1.Connect a 10 dB pad and modulation analyzer to J402. 2.Press the “FM” and “3 kHz LPF” switches of the modulation analyzer. 3.Inject a 1 kHz sine wave at 400 mV RMS into P100, pin 32 on the Main Audio Card (MAC). 4.Using the software adjust U207 with “Up/Dn” and "PgUp/PgDn" keys for 707 mV RMS on P100, pin 29. This waveform should be a “clean” sine wave. 5.Press the space bar to key the Exciter. 6. Set RV401 for
3 kHz deviation (25 kHz channels) or ±1.5 kHz deviation (12.5 kHz channels). 7.Press the space bar to unkey the Exciter. 8.Adjust R237 for a 2V P-P square wave on P100, pin 29. 9.Press the space bar to key the Exciter. 11 10. Set RV101 for “best” square wave as observed on the modulation analyzer output to the oscilloscope. NOTE: Ensure that the oscilloscope is “DC” coupled and the Modulation Analyzer has the 3 kHz LPF switch set but NOT the 300 Hz HPF or 50 Hz HPF switches set. 11. Press the space bar to unkey the Exciter. 125W POWER AMPLIFIER ALIGNMENT Refer to Figures 4 and 5 for component locations. Refer to Figure 7 for equipment needed and setup diagram. Select "PA" from the "TEST" menu in the Repeater Software. DRIVER TUNING AND LIMIT ADJUSTMENTS 1.Connect an antenna or dummy load to the RF port (50 ohm impedance). 2.Connect the: Power supply ground lead to P105 +15V DC lead to P103 +26.5V DC lead to P101 36-pin cable to J101 on the RFIB 3.Set the signal generator to +19 dBm ±0.1 dB. Connect the signal generator to WO513. 4.Press the space bar to key the PA. 5.Monitor the voltage on R45 on the RFIB and set R76 for 1.3V DC (see Figure 5). POWER AMPLIFIER TUNING Connect an antenna or dummy load to the RF port (50 ohm impedance). Use the carrier frequency needed. 1.Set RV501 on the PA fully counterclockwise. Set RV502 on the PA fully clockwise, see Figure 4. 2.Set Forward Power Adjust R611and Reflected Power Adjust R661 on the power detector board fully counter- clockwise (see Figure 4). 3.Monitor the voltage at R45 on the RFIB and set R76 for 1.3V DC (see Figure 5). This sets the current limit point for driver Q501 at hot temperatures. 4.Set each of the quiescent currents for Q502 and Q503 for 10 mA (DC) each. 5.Program the power output for the correct frequency range as follows: 132-150 MHz 125W 150-178 MHz 125W 12 6.Press the space bar to key the PA. Output power will be approximately 80W. 7.Monitor the output power and tune C601 and C602 for maximum output power, see Figure 4. 8.Set Forward Power Adjust RV601 for rated power (125W). 9.Press the space bar to unkey the PA. 10. Disconnect the antenna or dummy load from the RF port. 11. Press the space bar to key the PA. NOTE: This will not harm the PA. 12. Adjust Reverse Power Calibration Pot RV602 for equal voltages on W121 and W126 on the RFIB or for equal Forward and Reverse Power (see Figure 5). 13. Press the space bar to unkey the PA. Figure 4 125W POWER AMPLIFIER ALIGNMENT POI…

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FCC ID: ATH2422001-1 MFA p0060012, d0080119 Date: August 30, 2000 Federal Communications Commission Via: Electronic Filing Attention: Authorization & Evaluation Division Applicant: E. F. Johnson Company Equipment: 242-2031-313 FCC ID: ATH2422001-1 FCC Rules: 47 CFR 1.1307, Environmental Assessment Gentlemen: On behalf of the Applicant, enclosed please find the Supplemental Test Data Report, the whole for Environmental Assessment (MPE) of the referenced equipment as shown. We trust the same is in order. Should you need any further information, kindly contact the writer who is authorized to act as agent. Sincerely yours, Morton Flom, P. Eng. enclosure(s) cc: Applicant MF/cvr FCC ID: ATH2422001-1 MFA p0060012, d0080119 Sub-part 1.1307: SUPPLEMENTAL REPORT ENVIRONMENTAL ASSESSMENT General Population / Uncontrolled Exposure, Maximum Permissible Exposure EQUIPMENT IDENTIFICATION E. F. Johnson Company FCC ID: ATH2422001-1 DATE OF REPORT August 30, 2000 SUPERVISED BY: Morton Flom, P. Eng. FCC ID: ATH2422001-1 MFA p0060012, d0080119 TABLE OF CONTENTS RULEDESCRIPTIONPAGE . Test Report 1 . Identification of the Equipment Under Test 2 . Standard Test Conditions and Engineering Practices 4 1.1310 Environmental Assessment 5 FCC ID: ATH2422001-1 MFA p0060012, d0080119 PAGE NO.1of7. Required information per ISO/IEC Guide 25-1990, paragraph 13.2: a) TEST REPORT (SUPPLEMENTAL) b) Laboratory: (FCC: 31040/SIT) (Canada: IC 2044) M. Flom Associates, Inc. 3356 N. San Marcos Place, Suite 107 Chandler, AZ 85225 c) Report Number: d0080119 d) Client: E. F. Johnson Company, 299 Johnson Ave. Waseca, MN 56093-0514 e) Identification: 242-2031-313 FCC ID: ATH2422001-1 Description: VHF Repeater f) EUT Condition: Not required unless specified in individual tests. g) Report Date: August 30, 2000 EUT Received: June 13, 2000 h, j, k): As indicated in individual tests. i) Sampling method: No sampling procedure used. l) Uncertainty: In accordance with MFA internal quality manual. m) Supervised by: Morton Flom, P. Eng. n) Results: The results presented in this report relate only to the item tested. o) Reproduction: This report must not be reproduced, except in full, without written permission from this laboratory. FCC ID: ATH2422001-1 MFA p0060012, d0080119 PAGE NO.2of7. IDENTIFICATION OF THE EQUIPMENT UNDER TEST (EUT) NAME AND ADDRESS OF APPLICANT: E. F. Johnson Company 299 Johnson Ave. Waseca, MN 56093-0514 MANUFACTURER: Applicant FCC ID: ATH2422001-1 MODEL NO: 242-2031-313 DESCRIPTION: VHF Repeater TYPE OF EMISSION: 11K0F3E FREQUENCY RANGE, MHz: 132 to 178 POWER RATING, Watts: 25to125 Switchable x Variable N/A MODULATION: AMPS TDMA CDMA x OTHER – F3E ANTENNA: HELICAL x MONOPOLE OTHER NOTE: For RF Safety test antenna gain taken at the upper range of expected gain (i.e. 0 dBi) and RF Power set to highest nominal power across all channels. FCC ID: ATH2422001-1 MFA p0060012, d0080119 PAGE NO.3of7. M. Flom Associates, Inc. is accredited by the American Association for Laboratory Association (A2LA) as shown in the scope below. "This laboratory is accredited by the American Association for Laboratory Accreditation (A2LA) and the results shown in this report have been determined in accordance with the laboratory's terms of accreditation unless stated otherwise in the report." Should this report contain any data for tests for which we are not accredited, or which have been undertaken by a subcontractor that is not A2LA accredited, such data would not covered by this laboratory's A2LA accreditation. FCC ID: ATH2422001-1 MFA p0060012, d0080119 PAGE NO.4of7. STANDARD TEST CONDITIONS and ENGINEERING PRACTICES Except as noted herein, the following conditions and procedures were observed during the testing: In accordance with ANSI C63.4-1992, section 6.1.9, and unless otherwise indicated in the specific measurement results, the ambient temperature of the actual EUT was maintained within the range of 10° to 40°C (50°to 104°F) unless the par…

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