[Elecraft] Workaround for providing automatic SSB < > CW VFO offset

[Bill W5WVO]

Correct, as well as having QSK mode available!

Peter Wollan wrote:
> It looks like the difference between this process and "send CW while
> in SSB" which was added a while ago, is that with this you switch to
> the CW filters.  Is that right?
> 
>     Peter N8MHD
> 
> 
> On 6/11/09, Bill W5WVO <w5wvo at cybermesa.net> wrote:
>> A number of VHF ops on the list (myself included) have been lobbying
>> for some time for a feature that is standard on most or all HF+VHF
>> Ikensu rigs: the ability to have the VFO automatically offset by the
>> amount of the BFO pitch when switching between SSB and CW. This
>> capability is typically of little interest to HF operators, where
>> SSB and CW are rigidly separated into two distinct sub-bands. On VHF
>> and UHF, SSB and CW are used interchangeably, as needed, on the same
>> (SSB) frequencies.       
>> 
>> I've already had extensive discussions with Wayne about this; the
>> problem is, due to the software design architecture of the K3, it's
>> not as easy to implement as it sounds like it should be.  
>> 
>> The performance objective for switching from SSB to CW (CW to SSB is
>> simply the reverse) is for ONE button tap to accomplish: 
>> 
>>  (a) shifting the VFO frequency up (or down) 700 Hz (nominal pitch)
>>  (b) switching the K3 from USB to CW REV (or from LSB to CW)
>>  (c) bringing into play a pre-configured set of CW characteristics
>> that go with the transmission mode 
>> 
>> The workaround I've come up with accomplishes this, at the expense
>> of having a free VFO B to play with. On VHF/UHF, however, there is
>> virtually no split operation (except satellites), so this isn't as
>> big a deal as it sounds like.   
>> 
>> Here's how to do it, assuming USB and a pitch offset of 700 Hz
>> (substitute your own pitch setting if not 700): 
>> 
>> (1) Set MODE to USB, and set up all desired RX characteristics for
>> this mode in the normal fashion. 
>> 
>> (2) Set display resolution to FINE so it displays Hz (three decimal
>> places). 
>> 
>> (3) Tap A/B button, and repeat Step 2.
>> 
>> (4) Now set each VFO in turn (select using the A/B button) such that
>> one is zeroed out (xx.xxx.000), and the other displays xx.xxx.700. 
>> 
>> (5) Hold SUB and notice that the display says LINK. The two VFOs are
>> now locked together and will track 700 Hz apart. 
>> 
>> (6) Use the A/B button to select the VFO with the +700 Hz offset.
>> This will be your CW VFO. 
>> 
>> (7) Set MODE to CW REV, which will give you the same tuning
>> direction as USB. 
>> 
>> (8) Set up all desired RX characteristics for this mode in the
>> normal fashion. 
>> 
>> This completes the setup. From now on, a tap of the A/B button will
>> switch from USB to CW REV or from CW REV to USB, and the VFO will
>> automatically be set to the correct frequency, removing the
>> requirement of retuning to acquire the signal.   
>> 
>> RIT can still be used in the normal manner, but the offset will be
>> carried on RX when switching from one VFO to the other. Depending on
>> what you're trying to do, this may or may not be a good thing. Just
>> be mindful of the behavior.   
>> 
>> Please critique these instructions if you find anything unclear.
>> 
>> Bill W5WVO
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