TECHNICAL
SUPPORT
Alignment Procedures
Texas Ranger TR-396F
| • DC
Power Supply ( 13.8 Vdc, 20A ) • RF Wattmetter ( 25~60 MHz, 100W ) • Digital voltmeter or Multimeter. • Automatic Modulation Meter. • Audio Signal Generator • Digital voltmeter or Multimeter. |
• Frequency
Counter - 100 MHz • RF Signal Generator - 100 MHz • Automatic Distortion Meter • Oscilloscope (50 MHz), with X10 probe • SINAD Meter • 50 W dummy load |
To view proper test equipment setup for both the receiver and transmitter portion of the alignment procedures, please see this drawing - Test Setup. After viewing, press "back" to return to this page.
To view Main PCB Adjustment Location of adjustment points, please see this drawing - TR-396F Main PCB. After viewing, press "back" to return to this page.
The following steps are required to re-align the TR-396F.
Caution: Alignment should only be attempted by personnel trained in RF product testing and alignment.
1. VCO Voltage:
Disconnect the "short PCB" from TP7, TP8, and TP9. Set radio to CH 1 AM RX mode, set the Clarifier setting to 12 o'clock, connect a voltmeter to TP2.
Adjust L14 for 2.5 Vdc ± 0.1.
Connect ocilloscope to TP3
Adjust L15 for maximum output.
Set radio to CH 1 AM RX mode, connect frequency counter to Pin 7 of IC3.
Adjust VC1 to 10.2400 MHz ± 20Hz.
2. AM Frequency:
Set radio to CH 1 AM RX mode, connect frequency counter to TP3.
Adjust L20 to 16.27000 MHz ± 20Hz.
3. TX Frequency:
Set radio to CH 1 AM TX mode, connect frequency counter to TP3.
Adjust VR7 to 17.5500 MHz ± 20Hz.
4. AM OSC:
Set radio CH 1 AM TX mode, connect frequency counter to TP5.
Adjust L23 to 10.69500 MHz ± 20Hz.
This completes the PLL alignment procedure.
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1. AM TX Power:
Connect short "PCB " to TP7, TP8 and TP9, set radio to CH 19 AM TX mode, no modulation.
Adjust VR14 for 3.8W.
2. AM Modulation:
Set radio to CH 19 AM TX mode, audio signal 30 mV, 1 KHz to microphone.
Adjust VR16 for 90%.
This completes the Transmitter stage of the alignment procedure.
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1. AM Sensitivity:
Set radio to CH 19 AM RX mode, clarifier setting at 12 o'clock, RF gain fully clockwise, SQ at minimum, VOL control at 2 o'clock, connect RF SG to antenna jack, ( Frequency 27.185 MHz, Mod 30% )
Adjust L2, 3, 5, 6, 7, 8, 9, 10 for Audio Output > 2V S/N 10db.
Set radio to CH 40 AM RX mode, RF SG setting to 27.405 MHZ.
Adjust L2, 3, 5, 6, 7, 8, 9, 10 for Audio Output > 2V S/N 10db.
Set radio to CH 1 AM RX mode, RF SG setting to 28.245 MHZ.
Adjust L2, 3, 5, 6, 7, 8, 9, 10 for Audio Output > 2V S/N 10db.
2. NB Adjust:
Set radio to CH 19 AM RX mode, RF SG setting 27.205 MHz 100 µV, mod 30%, NB-ANL/OFF switch to NB/ANL position, connect voltmeter to TP1.
Adjust L1 for DC Voltage to max ( > 2.0V ).
3. AM Squelch:
Set radio to CH 19 AM RX mode, SQ control fully clockwise, RF SG setting 1 mV, mod 30%
Adjust VR4 very slowly until squelch just opens.
4. AM S/RF Meter:
Set radio to CH 19 AM RX mode, meter switch to S/RF position, RF SG setting 27.185 MHz 100 µV, mod 30%.
Adjust VR1 so that meter needle goes to S9 on the S scale.
This completes the Receiver stage of the alignment procedure.
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