TECHNICAL SUPPORT
Alignment ProceduresRCI-2980 Base
PLL Synthesizer / Oscillator Frequency Alignment - Receiver Alignment - Transmitter Alignment
Equipment required for Alignment procedure:
• DC Power Supply ( 13.8 Vdc, 20A )
• Oscilloscope (50 MHz), with X10 probe
• 50 W dummy load
• Frequency Counter - 0 to 30 MHz
• Digital voltmeter or Multimeter.
• Audio Generator
• FM Signal Generator
• SINAD Meter
• RF Wattmetter ( 25~60 MHz, 100W )
Internal Alignment Points:
VR1
VR2
VR3
VR4
VR5
VR8
VR10
VR11
VR12
VR13
VR14
VR16
AM Receive Meter CAL
SSB Receive Meter CAL
SSB Squelch Threshold
AM Squelch Threshold
FM TX Modulation
Transmit Meter CAL
PA Bias
Driver Bias
ALC ( SSB High Power )
AM Carrier ( High Power )
AM TX Modulation
CW Tone
L19
L20
L21
AM Frequency Adjustment
LSB Frequency Adjustment
USB Frequency Adjustment
To view Main PCB Adjustment for location of adjustment points, please see this drawing - 2980 Main PCB. After viewing, press "back" to return to this page.
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The following steps are required to re-align the RCI-298.
Caution: Alignment should only be attempted by personnel trained in RF product testing and alignment.
PLL Synthesizer / Oscillator Frequency Alignment:
1. VCO Voltage:
Disconnect the "Shorting PCB " from TP7, TP8, and TP9. Set radio to CH 1 AM mode, set the clarifier control to 12 o'clock, connect digital voltmeter to TP2 and ground.
Adjust L17 for 3.0 Vdc ± 0.1.
2. AM Frequency:
Connect frequency counter to TP3.
Adjust L19 to 17.360 MHz ± 300Hz.
3. USB Frequency:
Set radio to CH 1 USB mode, frequency counter to TP3.
Adjust L20 to 17.363 MHz ± 300Hz.
4. LSB Frequency:
Set radio to CH 1 LSB mode, frequency counter to TP3.
Adjust L21 to 17.358 MHz ± 300Hz.
5. TX Frequency (AM-USB-LSB):
Connect frequency counter to TP3, and verify the frequencies of step 2 (AM mode), step 3 (USB mode), and step 4 (LSB mode) remain the same.
6. AM:
Set radio to CH 1 AM TX mode, connect frequency counter to the cathode side of D62.
Adjust L19 to obtain 10.695 MHz ± 10Hz.
7. USB:
Set radio to CH 1 USB TX mode, connect frequency counter the cathode side of D62, and short collector to emitter of TR31.
Adjust L20 to 10.6925 MHz ± 10Hz.
6. LSB OSC:
Set radio to CH 1 LSB TX mode, connect frequency counter the cathode side of D62, and short collector to emitter of TR31.
Adjust L21 to 10.6975 MHz ± 10Hz.
This completes this stage of the alignment procedure.
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RCI-2980 Receiver Alignment:
1. Receiver Setup: Put the mode selector on AM, the RF gain fully clockwise (maximum gain), squelch to minimum (unsquelched), volume at 2 o'clock, CH 20, and NB/ANL to OFF. Connect an RF carrier frequency of 28.295 MHz, AM modulated with a 1 KHz audio tone at 30% modulation level.
2. AM Sensitivity:
Connect a SINAD meter to the external speaker jack.
Adjust L3, L4, L6, L7, L8, L10, L11 and L12 for best SINAD.
Increase the RF generator to 1mV RF carrier level.
Adjust L3, and L4 for minimum distortion.
Verify that the receiver AM sensitivity is better than 0.5µV for 10 db SINAD.
3. FM Distortion:
Change the RF generator to the FM mode, 1mV RF carrier level, FM modulated with a 1 KHz audio tone ± 3 KHz modulation level.
Adjust L5 for minimum distortion.
4. USB Sensitivity:
Turn off the audio modulation of the RF generator, and change it's frequency to 28.296 at an RF carrier level of 1mV. Set radio to USB RX mode.
Adjust L13 and L14 for maximum audio output ( must be greater than 3V).
5. LSB Sensitivity:
Keep the audio modulation of the RF generator off, change frequency to 28.294 at an RF carrier level of 1mV, set radio to LSB mode.
Adjust L13, and L14 for maximum audio output (must be greater then 3V).
6. NB Adjust:
Set radio to CH 21 AM RX mode, NB-ANL/OFF switch to ON, adjust RF generator to 28.305 MHz with an RF carrier level of 1mV, AM modulated with a 1 KHz audio signal at 30% modulation. Connect a digital voltmeter to TP1 (R11).
Adjust L1 and L2 for DC Voltage to max ( 1.3V ).
7. AM Scale Meter:
Turn NB-ANL switch to OFF, SWR/S/RF switch to S/RF position, set radio to CH 40 AM RX mode, RF signal generator setting 28.495 MHz with a carrier level of 100 µV, AM modulated with a 1KHz audio signal at 30%.
Adjust VR1 so that meter needle goes to S9 on the S scale.
8. USB Scale Meter:
SWR/S/RF switch to S/RF position, set radio to CH 40 USB RX mode, RF signal generator setting 28.496 MHz with a carrier level of 100 µV, no audio modulation.
Adjust VR2 so that meter needle goes to S9 on the S scale.
9. AM Squelch:
Set radio to CH 40 AM RX mode, SQ control fully clockwise, RF signal generator setting to 28.495 MHz , RF carrier level at 1 mV, AM modulated with a 1 KHz audio signal at 30%.
Adjust VR4 very slowly until squelch noise just goes off.
10. SSB Squelch:
Set radio to CH 40 USB RX mode, SQ control fully clockwise, RF signal generator setting to 28.496 MHz , RF carrier level at 1 mV, with audio modulation.
Adjust VR3 very slowly until squelch just goes off.
This completes the Receiver stage of the alignment procedure.
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RCI-2980 Transmitter Alignment:
1. Driver BIAS:
Remove the "Shorting PCB" from TP7, TP8, and TP9. Set radio to USB mode, connect current meter to TP9 (+) and TP8 (-).
Adjust VR11 to obtain 50 mA.
2. PA BIAS:
Set radio to USB mode, connect current meter to TP9 (+) and TP7 (-).
Adjust VR10 to obtain 75 mA.
3. SSB & AM RF Power:
Reconnect the "Shorting PCB " from TP7, TP8, and TP9. Connect a watt meter and a 50 Ohm load to the antenna connector, set radio to CH 40, USB mode, mic gain to maximum. Inject 30 milivolts of 1 KHz audio into the audio input pin of the mic jack (pin 2). Set SSB power control (VR12) to full counter clockwise position (maximum power position).
Adjust L18, L33, L40, L42, L43, and L44 to obtain maximum power output.
Adjust SSB power control (VR12) to 21 watts peak RF power output.
Change mode to AM
Adjust VR13 to obtain 10 watts RF power output.
4. Power Meter:
Set radio to CH 40, AM mode, mic gain control to maximum, meter switch to S/RF and key the transmitter.
Adjust VR8 until the RF meter reads 10 watts
5. TX AM Modulation:
Set radio to CH 40, AM mode, mic gain control to maximum, key the transmitter. Inject 30 milivolts of 1 KHz audio into the audio input pin of the mic jack (pin 2).
Adjust VR14 to 100% modulation.
6. TX FM Modulation:
Set radio to CH 40, FM mode, mic gain control to maximum, key the transmitter. Inject 30 milivolts of 1 KHz audio into the audio input pin of the mic jack (pin 2).
Adjust VR5 to 4.8 KHz ± 0.5 KHz.
7. CW Side-Tone Signal:
Connect a voltmeter directly across the speaker, key the transmitter using the CW jack in the rear of the radio.
Adjust VR16 to obtain 200mV across the speaker.
This completes the 2980 Transmitter stage of the alignment procedure.
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