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HF Transceiver and Receiver VFO Calibration
The following methods enable accurate field check of receiver and transceiver
calibration on receive, within 1 Hz by ear, without the need for special RF equipment.
METHOD #1 may be used only with HF SSB transceivers or receivers that have variable selectivity filters, passband tuning, IF tuning offset, or Twin Passband Tuning. Many modern ham radio transceivers have these features.
METHOD #2 may be used with any HF SSB transceiver or receiver, but it requires a second shortwave receiver capable of AM reception. This method is the most accurate.
METHOD #1
Note: only for HF SSB transceivers or receivers that have variable selectivity filters, passband tuning, IF Tuning offset, or Twin Passband Tuning.
  1. Stop or pause all software controlling the radio.
  2. Select manual VFO.
  3. Select USB Upper Sideband.
  4. Select widest bandpass filter.
  5. Turn off Clarifier or RIT.
  6. Turn off Notch.
  7. Turn off DSP Noise Reduction.
  8. Set Passband Tuning to -1.5kHz (toward the left as possible), this should enable you to hear both USB and LSB simultaneously. Icom transceiver Passband Tuning
  9. Tune to the highest Standard Frequency Time Signal, such as WWV on 10MHz, 15MHz, or 20MHz.
  10. Select 1Hz tuning speed of VFO.
  11. Wait for a minute when the standard audio tone is broadcast.
  12. While listening to the tone, tune VFO slightly above/below.
  13. Listen as you tune the VFO knob, for zero beat frequency. Zero beat is a point with the clearest pure musical sound, without rumble or slow vibration.
  14. Read the dial VFO frequency.
  15. The difference between the standard frequency and your dial VFO frequency is the calibration error.

METHOD #2
 
Notes:
This method of calibrating Radio A requires a second shortwave receiver (Receiver B).
Receiver B is the reference audio receiver.
Receiver B does not need to be an accurately calibrated receiver.
Receiver B must be set up before Radio A calibration is started.
Calibration Method 2

Radio A calibration:
  1. Stop or pause all software controlling Radio A while it is being calibrated.
  2. Select manual VFO.
  3. Select USB Upper Sideband.
  4. Turn off Clarifier or RIT.
  5. Turn off Notch.
  6. Turn off DSP Noise Reduction.
  7. Tune to the same Standard Frequency Time Signal as you are listening to "WWV" with Receiver B .
  8. Select 1Hz tuning speed of VFO.
  9. Wait for a minute when the standard audio tone is broadcast.
  10. While listening to the tone, tune Radio A  VFO slightly above/below.
  11. Listen to both Receiver B  and Radio A  at approximately the same volume level, as you tune the Radio A  VFO knob, for zero beat frequency. Zero beat is a point when the sound and tone pitch of both radios match. It is the clearest pure musical sound, without rumble or slow vibration.
  12. Read the dial VFO frequency of Radio A .
  13. The difference between the Standard Frequency Broadcast and Radio A  dial VFO frequency is the calibration error.
Receiver B set up:

Set up a common shortwave receiver Receiver B tuned to AM mode,
on the Standard Time Frequency broadcast you will use to calibrate,
such as WWV 10, 15, or 20MHz. Turn up the volume to a normal listening level. The accurate calibration of Receiver B in not necessary.

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