Equipment required for Alignment procedure:
• DC Power Supply ( 13.8 Vdc, 20A )
• Oscilloscope (50 MHz), with X10 probe
• 50
Ω
dummy load
• Frequency Counter - 100 MHz
• Digital voltmeter or Multimeter
• RF Signal Generator
• Audio Generator
• Automatic Distortion Meter
• SINAD Meter
• RF Wattmetter ( 25~60 MHz, 100W )
• Automatic Modulation Meter
To view Main PCB Adjustment for location of adjustment points, please see this
drawing After viewing, press "back" to return to this page.
The following steps are required to re-align the RCI-2950DX:
Caution: Alignment should only be attempted by personnel trained in RF
product testing and alignment.
PLL Synthesizer / Oscillator Frequency Alignment:
1. PLL2 - VCO Voltage:
A. Set radio to 24.890 MHz, AM RX mode, connect multimeter to TP10.
Adjust L14 for 1.0 Vdc ± 0.1.
B. Set frequency to 29.699 MHz, AM RX mode, connect multimeter to TP10.
Adjust L14 for 4.5 Vdc ± 0.1.
2. PLL1 - VCO Voltage:
A. Set radio to 24.890 MHz, AM RX mode, connect multimeter to TP10.
Adjust L13 for 1.0 Vdc ± 0.1.
B. Set frequency to 32.000 MHz, AM RX mode, connect multimeter to TP10.
Adjust L13 for 6.5 Vdc ± 0.1.
2. AM Frequency:
Set radio to AM RX mode, clarifier to 12 o'clock,. Connect frequency counter to
TP16.
Adjust VC2 to 10.1 MHz ± 10Hz.
3. VCO Output:
Set radio to 28.000 MHz, AM RX mode, connect oscilloscope to TP3.
Adjust L17 to 38.6950 MHz (maximum output).
4. AM OSC:
Set radio to AM TX mode, modulation off, connect frequency counter to TP5.
Adjust L18 to obtain 10.6950 MHz ± 10Hz.
5. USB OSC:
Set radio to USB TX mode, modulation off, short TP6 to ground, connect
frequency counter the TP5.
Adjust L20 to 10.6975 MHz ± 10Hz.
6. LSB OSC:
Set radio to LSB TX mode, modulation off, connect frequency counter to TP5.
Adjust L19 to 10.6925 MHz ± 10Hz.
This completes this stage of the alignment procedure.
