[Elecraft] SO2R setup

[W3FPR - Don Wilhelm]

True, and thanks for the clarification.
My CW PTT for the K2 does not address a situation where the K2 is keyed by
its internal commands - it only works with hardwired inputs to the K2 key
jack.
How many folks using or contemplating SO2R are using the KY commands for
keying?

73,
Don W3FPR

> -----Original Message-----
>
> Don replied (and I trust will not mind my keeping it on the list, as
> my intention is more than helping him):
>
> >Thanks for your analysis.
> >
> >One point though worthy of mentioning - the K2 will not produce RF until
> >keying takes place, so my solution does the job quite nicely by simply
> >inhibiting the keying.
> >
> >In many applications where the computer does both the keying and
> the 'PTT',
> >everything will sequence fine if the 'PTT' is simply not
> connected to the K2
> >(but connected to everything else - The RF path will be
> completed before the
> >program begins keying).  The only problem that will occur is
> when the K2 is
> >keyed directly by the paddles instead of through the computer control.
> >
> >Bottom line, many situations do not really need the CW PTT, but
> >unfortunately, SO2R operation where the steering is done through
> PTT is not
> >one of those situations.
>
> Effectively ANDing a 'PTT' line with the key line doesn't do much towards
> stopping the radio from transmitting when 'PTT' is unasserted if the radio
> is doing the keying.  A possible situation for this is where the
> K2 is used
> as a remote base & one wants to have a fail-safe should one want to not
> keep transmitting into something that has gotten ugly (failed amp,
> antenna, antenna switch, etc).  Even this radiosporting enthusiast can
> envision using his K2 with the KY command this way - I may one day
> soon only be able to operate with such a remote station & is one reason
> I bought a K2.
>
> Such a summary "unhappiness" alarm could also be used to
> implement the sort of positive control I think I would have to have
> on a remote base if I were to do this back in USA (though the rules may
> have changed since I left, it really is a good thing to do any way).
>
> I use a popular antenna matrix switching product that I think could tell
> me when it hasn't really switched due to how its way of doing interlock
> between its two ports (used for two radios) can become intermittent.  I
> would like use this to stop _all_ of my radios from transmitting under
> _any_ circumstances when I get around to figuring out a way of putting
> an unhappy light in the matrix.
>
> Some folks do not use logging programs that send CW for them.  A
> toggle or foot switch can just as easily drive switching of key, mic,
> PTT & audio between two rigs in an SO2R contesting station.  Other
> folks - at one time, myself included - will have nothing other than a foot
> switch determining if their station is in transmit or receive mode.
>
> So like how radios might be used, there is more to CW 'PTT' to
> consider.  That's why I didn't go further with the mod you have kindly
> put forward - it's better done in code.  Another one high on my list is
> filter selection - anyone who has heard what after-market filters can
> do to a radio can probably appreciate what it's like to sit on an INRAD
> prototype for the K2 & not be able to use it.  ;^(
>
> 73, VR2BrettGraham
>
>