[Elecraft] FW: K3: CW in SSB mode broken?

[Don Wilhelm]

Olli,

While your intention may have been for PTT use, and your documentation 
may be directed at PTT, the output from the sequencer is effectively an 
open circuit (sequence not complete) or a circuit closure (sequence 
complete).  That is simply a signal - it can be applied to the K3 TX INH 
input just as easily as being applied to the K3 PTT.

If you have an example of how your sequencer output is better applied to 
PTT than to TX INH, please tell us.  IMHO, the use of TX INH offers a 
much greater range of control over the switching events and the emission 
of RF from the K3.

73,
Don W3FPR

On 2/2/2012 7:17 PM, Oliver Dröse wrote:
>> While it might be possible to modify control to allow CW in SSB with
>> PTT if PTT and CW were activated at the very same instant (by adding
>> diodes from key in, dit in and dah in to PTT In), that would not fix
>> your issue with a sequencer since the sequencer (and foot switch) will
>> generally set PTT some fraction of a second *before* CW in any case.
> Well, it actually depends on the sequencer, I'd say. ;-))
>
> Within the "FA station manager" (http://www.dh8bqa.de/fa-sm/fa-sm-en.html) I
> designed the sequencer to only switch input trigger = output trigger. That
> means if you trigger the sequencer by PTT (i.e. from the mic) it will switch
> all stages for pre-amp, amp, etc. and then PTT to TRX as the last stage. If
> the trigger is CW then it will switch all stages for pre-amp, amp, etc. but
> *not* PTT to TRX but just opens the CW interlock to TRX so the radio will
> not see a PTT signal, only the CW signal. Therefor CW in SSB with the K3
> works perfectly well even using a sequencer. ;-))
>
> Nevertheless using TX-INH is probably the easier solution for K3's that
> already have a DVR built in (plus CW anyway). I've designed a solution for
> that case, too, but not yet up on my website.
>
> Vy 73, Olli - DH8BQA
> http://www.dh8bqa.de/
>
>
>
>
>
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