[Elecraft] MOX operation of k2

[Don Wilhelm]

Charlie,

The easiest way to accomplish what you need is to inhibit the paddle input
to the K2 until your sequencer has completed its tasks.  A set of relay
contacts in series with the paddle lines will do that.  You may have to use
some kind of auxiliary circuits to start the sequencer - I have no idea how
that is accomplished in your station - if it is accomplished with a manual
switch then the solution already exists, take the "OK to transmit" signal
from your sequencer and use it to activate the relay.

For a more complex solution, take a look at my website
http://w3fpr.qrpradio.com article on PTT for CW.  That circuit handles SSB
and CW seamlessly (but again, you must have something of your own choice to
start your sequencer).

73,
Don W3FPR


> -----Original Message-----

> Hello All,
>             Can anyone help with ideas on how to set up manual
> switching to Tx  in CW mode.  I wish to put the K2 into Tx
> without sending ANY RF to allow my Transverter time to run
> through it's fully sequenced switching.
>
> At present every time I hit the CW key, a burst of RF gets
> shunted up the back end of the last receive amplifier stage in my
> transverter  for about 700ms before full Tx switching occurs in
> the transverter.
> As yet I haven't  "blown" any devices up as I have placed Back
> -to-Back diodes to limit the RF voltage that the MMIC in the IF
> path sees.  However I feel there MUST be a more ele-gant
> solution! ( I am using my K2 for EME purposes, so it is more
> important to look after the LNA then the transverter IF chain)
>
> It is a pity that there cannot be a delay placed in the software,
> or otherwise, on when RF actually begins to appear once the K2 is keyed.
>
> Anyone driving a QRO amp. resolved this problem.  I suspect not
> too many running the 100 W version of the k2 to drive a 1500W amp
> would be happy to have the instantaneous RF on their output relays?
>
> Perhaps I have missed something about this along the way?
>
> Regards
> Charlie
> VK3NX
>