[Elecraft] Operated K3 SSB in CW band - not sure why

[Richard Ferch]

Guy,

It wasn't me. It was "kcflyers" (call sign unknown) who reported this - 
I wasn't awake enough when I replied and forgot to include his original 
message, which demonstrated a lack of understanding about the use of the 
two VFOs:

> My understanding is that VFO A is always used for transmit.  So having VFO B
> on 14027 should not have made it possible to transmit there.  And with Sub
> off, I don't see how VFO A could be transmitting on 14027 while I was
> tuning/listening in the SSB band.

If he was somehow making S&P QSOs while this was happening, he must have 
been transmitting simultaneously on both frequencies, which certainly 
would be an indication of serious problems inside the radio.

I suspect he was not making QSOs and just had Split turned on without 
being aware of it.

73,
Rich VE3KI


On 07/03/2011 12:57 PM, Guy Olinger K2AV wrote:
> My question is whether or not you were making contacts S&P during the
> time that this was occurring. If you WERE making contacts, then split
> was not on, and you have a problem of the B VFO frequency getting into
> the A VFO cable.
>
> If you do not have the KRX3, then the the single KSYN3 is switched back
> and forth and there is no possiblility of the problem you speak of
> unless you WERE actually transmitting split and the [SPLT] marker on the
> display would have been showing, just to the right of the [SUB] marker.
>
> But since you were talking about [SUB] I assume you have the KRX3 and a
> PAIR of KSYN3, and VFO B is the running frequency of the second KSYN3.
>   You need to check both mini-coax ends of every cable coming out of
> either KSYN3 and the KREF3.  It is very easy for those to be not fully
> seated.
>
> Also, if you have an older K3 and either KSYN3 is lacking the stiffener
> mod, you should do this. A beneficial side effect of this mod is to
> increase shielding to the KSYN3's.
>
> You can see illustrations of this mod at
>
> http://www.elecraft.com/manual/ELECRAFT%20KSYN3%20Stiffener%20Mod%20Rev%20D.pdf
>
> 73, Guy.
>
> On Mon, Mar 7, 2011 at 9:18 AM, Richard Ferch <ve3iay at storm.ca
> <mailto:ve3iay at storm.ca>> wrote:
>
>     VFO A is not always used for transmit. Whenever the radio is in Split
>     mode, VFO B is used for transmit. If you found yourself transmitting
>     using VFO B, Split must have been engaged somehow, either from the Split
>     button or from the software.
>
>     VFO A is always used for the main receiver.
>
>     When Split is off, the transmitter uses VFO A, but when Split is on, the
>     transmitter uses VFO B.
>
>     The subRX uses VFO B when Sub is in normal mode, but it uses VFO A when
>     Sub is in Diversity mode.
>
>     73,
>     Rich VE3KI
>
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