[Elecraft] K3(S) QSK Operation

[Mark E. Musick]

Scott, Bob and Everyone.
Also, note the article that Bob quotes is 4 years old. Pre K3S and pre KSYN3A upgrade of for K3s. It does not apply to a K3S or a K3 that has been upgraded with a KSYN3A.

73,
Mark, WB9CIF

-----Original Message-----
From: elecraft-bounces at mailman.qth.net [mailto:elecraft-bounces at mailman.qth.net] On Behalf Of K9MA
Sent: Wednesday, September 6, 2017 2:25 PM
To: Bob Wilson, N6TV <n6tv at arrl.net>; Elecraft Reflector <Elecraft at mailman.qth.net>
Subject: Re: [Elecraft] K3(S) QSK Operation

Thanks, Bob.

Yes, closing PTT allows sending at high speed.  I rarely send at over 35 wpm, but I guess I can just turn on the PTT when I do.  (I have an actual switch for that purpose. Remember those?) Firmware is up to date.

It doesn't sound like the KSYN3A will solve this problem, though, whatever its other merits.  I've never found the phase noise of the original to be an issue, so it's hard to justify the expense.

73,

Scott K9MA


On 9/6/2017 01:51, Bob Wilson, N6TV wrote:
> The 37 WPM jitter issue is actually related to VOX timing (with either 
> QSK or semi-breakin).  If you hold the PTT line closed while 
> transmitting, via a foot switch, software-controlled  PTT, or an 
> external keyer like a WinKey with a PTT output, you can send as fast 
> as you like, no CW jitter, but you give up QSK and semi-breakin.  This 
> works whether you have VOX ON or OFF.
>
> For more details, see this post from about 4 years ago:
>
> http://lists.f5mzn.org/pipermail/support/2013-November/083384.html
>
> The new KSYN3A synthesizer is highly recommended though, especially 
> for QRQ CW.
>
> Also, what firmware version are you running?
>
> 73,
> Bob, N6TV
>
> On Tue, Sep 5, 2017 at 8:19 PM, K9MA <k9ma at sdellington.us 
> <mailto:k9ma at sdellington.us>> wrote:
>
>     I just learned of the "37 wpm" problem with the original K3
>     (non-S), which I have.  I just verified that, indeed, above 37 wpm
>     the cw gets all messed up.  This seems to occur whether in QSK
>     (Break-in) or PTT mode.  The problem seems to go away, at least up
>     to 50 wpm, in the QRQ mode.
>
>     A possibly related issue is the slow QSK recovery.  In the normal
>     QSK mode, one can just hear between the dits at 16 wpm.  In QRQ
>     mode, that goes all the way up to 18 wpm.
>
>     Does the new synthesizer ala K3S solve either of these problems?
>     If not, is there another solution?
>
>     73,
>
>     Scott K9MA
>
>     -- 
>     Scott  K9MA
>
>     k9ma at sdellington.us <mailto:k9ma at sdellington.us>
>
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--
Scott  K9MA

k9ma at sdellington.us

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