Re: K2/XV-144 with sequencer and big amp

Posted by Don Wilhelm-4 on Dec 06, 2010; 12:16am
URL: http://elecraft.85.s1.nabble.com/K2-XV-144-with-sequencer-and-big-amp-tp5806317p5806346.html

  Bob,

No you cannot vary the K2 KEY (or PTT) closure to the onset of RF
timing.   It is quite close to 15 ms.

Your best solution IMHO is to first key the sequencer and then use the
output of the sequencer to operate the K2 PTT.

That works for modes except CW.  If you are using CW, the K2 always
operates QSK.  If you need a PTT input for CW mode, I invite you to look
at the circuit for doing that on my website www.w3fpr.com.
It will delay keying the K2 until the external PTT signal is asserted.

73,
Don W3FPR

On 12/5/2010 7:00 PM, Bob DeVarney W1ICW wrote:

> Second question.
> I am using my K2 and XV-144 as my EME rig. I take the output of the
> transverter key jack and feed it to my sequencer, which then sends the
> appropriately delayed signals to my amp ( 750 watts ) and my T/R relays
> and preamp at the tower.
>
> My question is this:
>
> Can I slow down the transition from receive to transmit internal to  the
> K2? Is there a menu option to do so? I could of course use the ptt
> signal from my computer to key my sequencer, and then have my sequencer
> key the K2, but what if I use the "tune" button on my front panel? That
> appears to be instantaneous.
> The last thing I want to do is wipe out a very expensive preamp or hot
> switch my relays with a 1 kW amp ( in the works )
>
>
> Thanks in advance,
>
> Bob W1ICW
>
> P.S. I have rediscovered my K2 this year, as a high performance VHF rig
> ! K2s aren't just for QRP HF any more, I've made over 170 EME QSOs with
> my K2, XV-144, 600 watts, and a small ( by EME standards ) array of 16
> dBd gain on 2 meters. Bravo to the Elecraft team for coming up with such
> a versatile product !
>

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