[Elecraft] K3 TX delay

[Igor Sokolov]

You are correct Rich.
I always use PTT foot switch. Even then longer then 8ms setting of TX delay 
affects CW. I do not understand why. It is not brake in. It is just switched 
to TX and stays put. Why CW should be affected by this setting?
My K3 is below 2000 serial number. I have just checked with my friend's 
above 6000 serial unit. It is still the same.  BTW  the internal delay 
between PTT into the radio and KEY OUT signal from the radio is about 6-6.5 
ms.  I assume there is only one relay in between. So if we have two relays 
in series externally or even one relay a bit more powerful (and therefore 
slower then the internal one) we have to use external sequencer. Even most 
popular power vacuum relays here have make time of 12-15 ms which precludes 
their use without external sequencer.
Thank you everybody for you comments. It looks like external sequencer is 
the only solution. Pity.

73, Igor UA9CDC


----- Original Message ----- 
From: "Richard Ferch" <ve3iay at storm.ca>
To: <elecraft at mailman.qth.net>
Sent: Wednesday, February 15, 2012 10:04 PM
Subject: Re: [Elecraft] K3 TX delay


>I think there's a bit more to it than that, Joe. My recollection, based
> on my experience in SS CW a couple of years back, is that if CONFIG:TX
> DLY is set to 20 ms, the K3's CW (with an external keyer) is "choppy"
> even when using semi-breakin or PTT. I can't be 100% sure whether I was
> using VOX or PTT, but I know for certain I was not using QSK, and I got
> reports of "distinctive-sounding" CW, not just a truncated first
> element. Setting CONFIG:TX DLY to 8 ms appears to have fixed it.
>
> 73,
> Rich VE3KI
>
>
> W4TV wrote:
>
>> One solution is to use a keyer like the K1EL WinKey that permits
>> adding a fixed length to the elements to compensate for the K3's
>> "bit clipping".  However, the proper solution would be for the K3
>> to extend each element by the length of TX Delay when in QSK and
>> extend the initial element by TX Delay when in semi-break in.
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