TECHNICAL SUPPORT
Alignment ProceduresTexas Ranger TR-296 Series
PLL Alignment - Transmitter Alignment - Receiver Alignment
Equipment required for Alignment procedure:
• DC Power Supply ( 13.8 Vdc, 20A )
• RF Wattmetter ( 25~60 MHz, 25W )
• 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 - Equipment Setup. After viewing, press "back" to return to this page.
To view Main PCB Adjustment Location of adjustment points, please see this drawing - TR-296 Main PCB. After viewing, press "back" to return to this page.
The following steps are required to re-align the TR-296 Series.
Caution: Alignment should only be attempted by personnel trained in RF product testing and alignment.
TR-296 PLL Synthesizer Alignment:
1. VCO Voltage:
Set radio to CH 1, AM RX mode, clarifier setting in 12 o'clock position, connect DC Voltmeter to TP9 (R207)
Adjust L19 for 2.5 Vdc ± 0.1.
Connect oscilloscope to TP10 (R101).
Adjust L21 for CH 1 & CH 40 maximum output and balance.
Connect oscilloscope to TP1 (R106).
Adjust L20 for CH 1 & CH 40 maximum output and balance.
2. AM Frequency:
Set radio to CH 1 AM RX mode, connect frequency counter to TP1 (R106).
Adjust L23 to 34.76500 MHz ± 20Hz.
3. LSB Frequency:
Set radio to CH 1 LSB RX mode, connect frequency counter to TP1 (R106).
Adjust L22 to 34.76350 MHz ± 20Hz.
4. USB Frequency:
Set radio to CH 1 USB RX mode, connect frequency counter to TP1 (R106).
Adjust L59 to 34.76650 MHz ± 20Hz.
5. TX Frequency:
Set radio to CH 1 AM TX mode, connect frequency counter to TP1 (R106).
Adjust VR5 to 34.7650 MHz ± 20Hz.
6. AM TX Frequency:
Set radio to CH 19 AM TX mode, set Mic gain fully counter clockwise, connect frequency counter to cathode of D2.
Adjust L31 to 27.18500 MHz ± 20Hz.
7. LSB TX Frequency:
Set radio to CH 19 LSB TX mode, set Mic gain fully clockwise, AF Signal 25 mV, 1 KHz to microphone, connect frequency counter to cathode of D2.
Adjust L30 to 27.18400 MHz ± 20Hz.
8. USB TX Frequency:
Set radio to CH 19 USB TX mode, set Mic gain fully clockwise, AF Signal 25 mV, 1 KHz to microphone, connect frequency counter to cathode of D2.
Adjust CT2 to 27.18600 MHz ± 20Hz.
This completes the PLL alignment procedure.
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TR-296 Transmitter Alignment:
1. BIAS Current:
Set radio to CH 19 USB TX mode, Mod Off. Connect current meter to TP8 ( + ) and green lead wire ( -)
Adjust VR9 for 30mA.
Connect current meter to TP7 ( + ) and violet lead wire ( -)
Adjust VR8 for 50mA.
2. AM TX Power:
Set radio to CH 19 AM TX mode, modulation off, connect RF power meter to antenna jack.
Adjust L48, L47, L46, L45, L38, L36 for Maximum RF power output.
Adjust L38 to balance power between CH 1 & CH 40.
Adjust VR10 for 4W.
3. SSB ALC:
Set radio to CH 19, SSB TX mode, Mic Gain fully clockwise, AF signal 25 mV, 1 KHz to microphone.
Adjust VR11 for 12 Watts.
4. SSB Carrier Balance:
Set radio to CH 19, SSB TX mode, Mic Gain Off, connect oscilloscope to L44 (TR39C).
Adjust VR4 for Spurious Emissions to minimum.
5. AM Modulation:
Set radio to CH 19, SSB TX mode, Mic Gain fully clockwise, AF signal 30 mV, 1 KHz to microphone.
Adjust VR7 for 95%.
6. RF Power Meter:
Set radio to CH 19, SSB TX mode, MOD off.
Adjust VR6 for RF Power meter needle until it is in-between the green and red bar on PWR scale.
This completes the Transmitter stage of the alignment procedure.
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TR-296 Series Receiver Alignment:
1. AM Sensitivity:
Set radio to CH 20 AM RX mode, clarifier setting in 12 o'clock, RF gain fully clockwise, SQ fully counter clockwise, VOL control at 2 o'clock, NB-ANL/OFF switch to OFF, connect RF SG to antenna jack, ( Frequency 27.205 MHz, 1 µV. Mod 30%, 1 KHz. ).
Adjust L13, L15, L3, L4, L5, L6, L7,L8,L9, L10 for Audio Output > 2V S/N > 10db.
Set radio to CH 40 AM mode, RF SG setting to 27.405 MHZ.
Repeat above adjustments for Audio Output > 2V S/N > 10db.
Set radio to CH 1 AM mode, RF SG setting to 26.965 MHZ.
Repeat above adjustments for Audio Output > 2V S/N > 10db.
2. USB Sensitivity:
Set radio to CH 20 USB RX mode, modulation Off, Vol control fully clockwise, RF SG setting 27.206 MHz Level 1.0 µV.
Adjust L12 and L14 for audio output > 4.5V, S/N > 20db.
3. LSB Sensitivity:
Set radio to CH 20 LSB RX mode, modulation Off, Vol control fully clockwise, RF SG setting 27.204 MHz Level 1.0 µV.
Adjust L12 and L14 for audio output > 4.5V, S/N > 20db.
4. NB/ANL Adjust:
Set radio to CH 20 AM RX mode, RF SG setting 27.205 MHz Level 100 µV, mod 30%, 1 KHz, NB/ANL/Off switch to NB/ANL, Connect Voltmeter to D2 (Cathode).
Adjust L1 and L2 for DC Voltage to max ( > 1.3V ).
5. AM Squelch:
Set radio to CH 20 AM RX mode, SQ control fully clockwise, RF SG setting 27.205 MHz 1 mV, mod 30%
Adjust VR3 very slowly until squelch just opens.
6. AM S/RF Meter:
Set radio to CH 20 AM RX mode, mod Off,, set S-RF/CAL/SWR switch to S/RF position, RF SG setting 27.205 MHz, Level 100 µV.
Adjust VR1 so that meter needle goes to S9 on the S scale.
7. SSB S/RF Meter:
Set radio to CH 20 USB RX mode, mod Off,, set S-RF/CAL/SWR switch to S/RF position, RF SG setting 27.206 MHz, Level 100 µV.
Adjust VR2 so that meter needle goes to S9 on the S scale.
This completes the Receiver stage of the alignment procedure.
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