Oh crap!
I just had an ah hah moment.
With the SB-104, I need to offset the VFO slightly when going from CW to LSB. I
think CW and USB have the same offset.
That radio does not use RIT.
I guess it would be possible to use a small trimmer and dial in the necessary
offset in the form of a voltage and apply that to RIT function.
A simple transistor switch will put the offset circuit in and out as needed.
Only problem is, I don’t have a clue on how to modify the sketch to do that.
mike, wb8vge
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> On Oct 29, 2017, at 5:53 AM, Steve Hunt <steve@karinya.net> wrote:
>
> Curt,
>
> That function will return a value in variable RIT between -1000 and +1000,
> proportional to the analogue RIT voltage. You then simply add that to your
> required output frequency before executing the function that sets the DDS
> frequency.
>
> So, if the "main" frequency was 5,100,000Hz and the RIT voltage was 3.75v,
> that function would return a value for RIT of +534Hz which you would then add
> to 5,100,000 to set the DDS to 5,1000,534Hz.
>
> One thing to check is that the frequency updates are done fast enough that
> the DDS will follow the frequency shifts required during fast keying.
>
> Steve G3TXQ
>
>
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