MODELS: 148 GTL 148 GTL ST 148 NW ST REVISION: DATE: 03/11/03

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1 . ALIGNMENT PROCEDURE MODELS: 148 GTL 148 GTL ST 148 NW ST REVISION: DATE: 03/11/03 PREPARED BY: BURKE Total Pages: 8 pages Page:1 print date: 3/27/06

2 1 TEST CONDITION: 148NWST ALIGNMENT INSTRUCTION 1.0. TEST TEMPERTAURE: 25 ±5 C 1.1. STANDARD DC POWER: 13.8VDC 1.2. MEASUREMENT CHANNEL: CH19 (27.185MHz) 1.3. STANDARD AUDIO LOADING: 4 Ω 1.4. ANTENNA IMPEDANCE: 50 Ω 1.5. STANDARD RF INPUT: 1mV 1.6. STANDARD REF. MODULATION: CB 30% 1.7. STANDARD REF. AUDIO OUTPUT: 0.5W SSB 500Hz and 2400Hz 1.8. PULSE GENERATOR: 1µS 100mS and 1V peak-to-peak amplitude, 1.9. FREQUENCY TABLE: CH NO. FREQ. (MHz) CH NO. FREQ. (MHz) with rise and fall time of less than 10nS. Page:2 print date: 3/27/06

3 1.9. TEST EQUIPMENT SETUP AS BELOW: A. TX test equipment setup: Spectrum Analyzer Power Supply Modulation Meter Dummy Load 148NWST RF Wattmeter Audio Gen. B. RX test equipment setup: AC VTVM RF Signal Generator Oscilloscope 148NWST Power Supply 4 ohm Load Noise pulse generator Page:3 print date: 3/27/06

4 2.0 MAIN ALIGNMENT 2.1 VCO Alignment 1, AM, CH1 DC voltmeter to TP9 L19 Adjust for 3.2V, ±0.1V Check CH40 = 4.2V, ±0.2V 2, AM, CH19 Oscilloscope to TP10 L21 Adjust for maximum output 3 Same as step 2 Oscilloscope to TP1 L20 Adjust for maximum output 4, AM, CH19 Voicelock Midrange TP1 L23 Adjust for MHz 5, LSB, CH19 L22 Adjust for MHz Voicelock Midrange 6, USB, CH19 Voicelock Midrange TP1 TP1 L59 Adjust for MHz 2.2 Carrier Alignment 1, AM, CH19 Adjust for 7.8MHz, then cathode of D17. L31 re-connect TP7 & TP8 Disconnect TP7 & TP8. 2, LSB, CH19 TP14 L30 Adjust for MHz 3, USB, CH19 TP14 CT2 Adjust for MHz 3.0 RECEIVER ALIGNMENT Connect an AC VTVM across speaker coil. Adjust volume control to obtain a suitable indication. Set generator output low enough to prevent AGC limiting. Preset controls as follows, unless otherwise noted: RF Gain maximum, Voicelock midrange, Squelch minimum, NB/ANL off, Tone normal Output of signal generator through 0.01µF to TP16 (TR15 emitter). Freq. = MHz NO modulation, RF output 200µV Output of signal generator through 0.01µF to TP15 (FET1 Gate 1). Freq. = 455KHz, 1KHz 30% modulation, RF output 100µV modulation, RF output 1µV L7, L8, L9, L10, L12, L14 L15, L13, L3 Adjust for maximum output Adjust for maximum output L4, L5, L6 Adjust for maximum output Page:4 print date: 3/27/06

5 4 NB/ANL switch set to NB Output of signal generator and noise pulse generator to modulation, RF output 1µV. Oscilloscope to TP17. L1, L2 NOISE BLANKER Adjust for maximum pulse amplitude on oscilloscope Squelch to maximum modulation, RF output 1800µV modulation, RF output 100µV Freq. = MHz, no modulation, RF output 100µV VR3 VR1 VR2 SQUELCH RANGE Adjust until audio just appears AM SIGNAL METER Adjust for a reading of 9 on the analog meter of the CB radio SSB SIGNAL METER Adjust for a reading of 9 on the analog meter of the CB radio 4.0 Transmitter Alignment Maintain a 50 ohm 25 watt dummy load on the antenna connector for the following steps. 1 Dynamike minimum 2 Same as step 1 3 Dynamike minimum input Spectrum analyzer to antenna input input L47, L48, L46, L45, L38 L36 VR7 4 Same as step 3 Insert ammeter at TP8. VR9 5 Same as step 3 Insert ammeter at TP7. VR8 6 7 Dynamike maximum Dynamike minimum input. Insert a two-tone, 500mV signal to microphone input. input. VR11 VR10 Adjust for maximum RF output Adjust for minimum at 54MHZ (2nd harmonic) CARRIER BALANCE Adjust for minimum RF output DRIVER BIAS Adjust for 25mA FINAL BIAS Adjust for 50mA SSB ALC Adjust for 12 watts PEP RF output AM CARRIER POWER Adjust for 4 watts RF output Page:5 print date: 3/27/06

6 8 Same as step 7 VR6 RF POWER METER Adjust so that the needle of the CB s analog meter is at the border between the green and red zones. 9 Same as step 7 TX CARRIER FREQUENCY VR5 Adjust for MHz 10 Modulation meter to Insert a AMC CONTROL VR501 1KHz, 50mV signal to Adjust for 90% modulation Dynamike maximum microphone input. Remove the dummy load. Connect a 100 ohm load to the antenna 11 input. Use the built-in SWR meter to check the SWR. VR12 SWR METER Adjust for an SWR reading of 2 Page:6 print date: 3/27/06

7 Page:7 print date: 3/27/06

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