Depending on the brand/model of HF rig, some have the audio processing active on FM mode and some do not. Also, a few of the models are 2.5 KHz deviation, not 5 KHz. My Icom IC-7000 has three filter settings active in FM that result in 5 KHz, 4 KHz and 2.5 KHz deviation, plus adjustment to respective CTCSS levels.?
tnx
Mike / K5JR?
Alpharetta GA
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On May 22, 2025, at 10:15?PM, KB9LFZ via groups.io <silver@...> wrote:
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Turn off the processor.
Some older radios have one mic gain as a knob adjustment. The level for SSB is different than FM.
A cheap SDR watching the audio spectrum and zoom in on RF spectrum can assist getting FM deviation to 3KHz at 1KHz tone
Benjamin, KB9LFZ?
I have some potential users of my 6M FM
repeater that want to use their HF rigs for that purpose.
Unfortunately most that have tried have terrible audio - over
driven and distorted. What do they need to pay attention to with
their rigs? FWIW, I do not have an HF radio because I have zero
interest, so I'm no help to them.
Chuck
WB2EDV
