[Elecraft] XVRT sequencing

[W3FPR - Don Wilhelm]

Evert,

You are correct, the K2 is always 'full QSK' operation on CW, and a key
closure is what begins the cycle.  The K2 amplifier keying circuit shown on
the Elecraft website will provide an output that essentially says "RF output
will follow in about 15 ms."

Take a look on my website http://w3fpr.qrpradio.com for the 'CW PTT' - it
will accomplish the function you want.  It's operqtion is to interrupt the
keying until a signal is received on the added PTT input.  How your
sequencer chain is kicked off may be another problem, that part of the
implementation is up to the user - if you use a footswitch or similar, then
the answer is obvious, but if it is started by just hitting the paddles,
there will be no source for the sequencer start signal.

73,
Don W3FPR

> -----Original Message-----
>
> Hello to all,
>
> I'm at the stage of inserting my K2 into the VHF setup. I've been using a
> Ten-Tec Paragon for the last 18 years as the IF stage for my 2
> mtr station.
> The Ten-Tec has two connectors at the back (RCA?) with the
> function "TX-OUT"
> and "TX-EN". In normal standalone operation a bridge is plugged in. When
> using amps, and in my case a XVRT - PA - HF Relay, the TX-OUT is a request
> for transmit (initiated by the internal combination of the PTT, key(er) or
> tune button. I use this signal in my sequencer to sequentially switch the
> final HF-relay - switch the PA in TX mode - and switch the XVRT in TX mode
> after a defined time delay. When this procedure is accomplished I give an
> enable (TX-EN) signal to the Ten-Tec to switch over in TX mode. This
> procedure enables absolute power-free switching. (I never blew any relays,
> amps and preamps in the last 18 years of intensive use).
> To make use of my sequencer again, I was looking for this function in the
> K2. Unfortunately I could not find this closed loop procedure.
>
> Of course I can short circuit the "XVRT-OUT" plug (after a 10 dB pad) from
> the K60XV module to prevent RF injection into my XVRT. I just don't like
> this type of solution.
>
> I saw an RX 8V signal on the DB9 / RS232 connector (included in the KPA100
> option, which I bought but not installed yet), but this signal is not the
> one I can use as described in my above story.
>
> Is there anyone out there who made some changes in the K2 which gives
> similar sequence procedures as with the Ten-Tec?
>
>
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