TX DLY distortion

[Lee Trout]

 With the talk on using older amps, it seems I recall there was distortion
introduced on CW if the delay was set to the higher end?  Has that problem
been solved via firmware?

Sorry if this has already been answered, but I could not find anything on
it.

73, Lee
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[Bob Wilson, N6TV]

If you are using the internal keyer of the K3 (or KY commands), with CW QRQ
OFF, there is no timing distortion of transmitted CW elements for any value
of CONFIG:TX DLY, as long as VOX is used, and the PTT line is not closed
with a footswitch.  The internal keyer compensates for the increased TX
delay.   This works with both full break-in (QSK) and semi break-in.

CW speeds above 37 WPM are badly distorted by jitter for both internal and
external keying if you do not have a K3S or K3 with KSYN3A upgrade and CW
QRQ mode is OFF.

As noted previously, if you want a true TX DLY of 10 ms, set CONFIG:TX DLY
to 13 (not 10).

If you are using external keying from a WinKey or via serial port with
CONFIG:PTT-KEY = OFF-DTR, with VOX ON, QSK OFF (semi break-in) and no PTT
line closure, the first transmitted element will be truncated by the TX DLY
setting (minus 2 or 3 ms assuming you have a K3S or K3 with KSYN3A
upgrade).  If using full break-in (QSK), *all* trnasmitted elements will be
truncated for any value of TX DLY above 008 with external keying.

Tcompensate for that, as mentioned previously, increase the length of every
externally-keyed element by a fixed amount, using the WinKey "Keying
Compensation" and/or "1st dit extension" setting.  In the microHAM MK2R+
Router, it is now called "R/T delay", located on the Router's PTT tab (not
the WinKey tab).

None of this applies if you set CW QRQ ON.  The TX DLY drops to about 4.5
ms,  and CONFIG:TX DLY is ignored.  None of this applies if your keyer or
software holds the PTT line closed for the duration of a CW message.

I have not made any measurements on an older unmodified K3 yet.

73,
Bob, N6TV

On Mon, Jun 11, 2018 at 12:36 PM, Lee Trout <[hidden email]> wrote:

>  With the talk on using older amps, it seems I recall there was distortion
> introduced on CW if the delay was set to the higher end?  Has that problem
> been solved via firmware?
>
> Sorry if this has already been answered, but I could not find anything on
> it.
>
> 73, Lee
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
> Message delivered to [hidden email]
>

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