[Elecraft] K2 8R/keyline-RF Timing Questions

[w2bvh]

Steve

I measured this a couple of years ago and put the info in my notebook. 
As you mention, 8R transitions 15 ms before rf output.  It doesn't 
transition back  again until  5 ms after  rf  has  stopped. The timing 
is completely independent of the t-r value set in the primary menu. I 
tried it with t-r=.02 sec and t-r =1.0 sec and the timing was the same. 
This was in cw mode. I don't have measurements for ssb.

I used the info to see if I needed to make external timing circuits for 
a hb transverter I was building. I didn't. And the transverter works fb. 
(I did use fast relays though)

Hope this helps.

73,
Lenny W2BVH


Steve Kavanagh wrote:
> I read on this forum that there is about 15
> milliseconds delay between the transition of the 8R
> line from receive to transmit (and hence of the key
> out lines in the KPA100 and K60XV) and the beginning
> of RF output.  I have a couple of questions with
> respect to this delay:
>
> (1) Does this apply on both CW and SSB ?
>
> (2) What happens on the transmit-to-receive transition
> ?  Does RF cease before or at the same time as the 8R
> line or is there a similar delay ?
>
> Just pondering how to interface various non-elecraft
> transverters....can anyone advise ?
>
> 73,
> Steve VE3SMA
>
>
>
>
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