[Elecraft] Switching from SSB to CW on K3s

[Joe Subich, W4TV]

Don,

The K3/K3S will automatically handle the offset if you configure it
to do so.  From the K3 Owner's Manual, page 29:

> SSB/CW VFO Offset
> The K3 can automatically offset the VFO frequency when you switch
> from SSB to CW mode, so other stations will hear the correct CW
> pitch. See CONFIG:CW WGHT for details.

and page 55:

 > CW WGTH   Tap 5 to select automatic VFO offset on SSB/CW mode change
 >           (VFO OFS) or no offset (VFO NOR, default). Automatic offset
 >           is often used on 6 meters, where mixed-mode QSOs are
 >           necessary during fading. Note: Pitch matching will be
 >           more accurate if USB is paired with CW REV, and LSB with
 >           CW normal.

To answer the original question - with CW WGTH 5 set to VFO OFS I have
no problem tuning a station in SSB and switching to CW without losing
the signal.  The station is  it more "accurate" on 160/80/40 where one
switches from LSB to CW-L than on on 20-6 when switching from USB to
CW-L but it's still relatively close (as accurate as I can match the
correct CW pitch when tuning in SSB).

73,

    ... Joe, W4TV


On 3/14/2016 8:57 PM, Don Wilhelm wrote:
> Bob,
>
> Assuming you have the CW signal (in SSB mode) tuned to your sidetone
> pitch ---
> You will have to re-tune by the amount of your sidetone pitch when
> switching to CW.
>
> The K3 (and all other Elecraft transceivers) insert a VFO offset between
> SSB and CW equal to the sidetone pitch set into the radio during receive.
> SSB has no offset.
>
> In other words, if you are listening to a 600 Hz CW signal when tuned to
> a 7040.00 kHz CW signal when in SSB mode (and your sidetone pitch is set
> at 600 Hz), you are actually hearing a CW signal at 7039.40 kHz when
> tuned to 7040.00 kHz (assuming you have LSB set in SSB mode).
> When you switch to CW, you will have to tune to 7039.40 kHz to hear that
> same CW signal at 600 Hz - and that is the actual CW transmit frequency.
>
> In other words, in SSB mode, the K2 frequency indication is the
> suppressed carrier frequency, but in CW mode it is the transmit
> frequency of the CW signal.
>
> To further complicate matters, if you set CW in SSB on in the menu, that
> relationship changes.  You will transmit offset from the suppressed
> carrier frequency by the amount of the sidetone pitch so your signal can
> be heard by other stations tuned for SSB.
>
> 73,
> Don W3FPR
>
> On 3/14/2016 8:28 PM, Bob Novas wrote:
>> When I'm in SSB mode and I tune down to the CW frequencies, I can easily
>> tune in a CW signal. Then, I switch to CW mode, and the CW signal is gone
>> because I'm on the wrong sideband. Even if I'm on the right sideband,
>> the CW
>> signal disappears.  Shouldn't I be able to switch from SSB to CW and not
>> lose a CW signal?  Am I doing something wrong?  Thanks, Bob - W3DK
>>
>
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