[Elecraft] K3 TX delay choices

[Joe Subich, W4TV]

> Years ago, using QSK with a 1kmp (adjustable TX delay) with an
> Ameritron AL1200 (not a QSK amp), in a contest I would often get
> "UE7XF?". Using 'break-in' + 'VOX' would get "VE7XF".

That was typical with Yaesu FT-1000MP and MKV.  If the PTT did not
close more than the "TX Delay" time before the key closed the first
element would be dropped entirely (not just clipped).  Using break-in
+ VOX allowed the rig to switch before the PTT.  Yaesu never did
"delay" the CW ...

> I'm never sure whether to use the TX Delay available in the microHAM
> software or in the K3 (or both). (Any hints, Joe?)

If you're using PTT switching or semi-break in (VOX), I'd set the
PTT Lead in microHAM Router to 25 ms (long enough for even the slow
relay in the AL-1200) and use the microHAM PA PTT output to key the
amplifier *before* the K3 and leave the K3 set for its normal 8 ms
TX Delay.

This probably means switching the PA PTT line when switching amplifiers
or adding diodes so the lines can be safely connected in parallel.

73,

    ... Joe, W4TV


On 2/15/2012 3:25 PM, Ralph Parker wrote:
> I don't use QSK - I don't like the noise between characters.
> In casual DXing, I (almost) always use a footswitch to ensure the amp has
> settled before any RF hits it. I always use an external keyer.
> While contesting, I use N1MM to microHAM (Winkey) to K3.
> I'm never sure whether to use the TX Delay available in the microHAM
> software or in the K3 (or both). (Any hints, Joe?)
>
> Years ago, using QSK with a 1kmp (adjustable TX delay) with an Ameritron
> AL1200 (not a QSK amp), in a contest I would often get "UE7XF?".
> Using 'break-in' + 'VOX' would get "VE7XF".
>
> When I switched to a true QSK amp (Acom 1000), lead element elimination in
> QSK was no longer a problem. I still didn't use it because of the noise,
> but I was confident that the amp was happy.
>
> Now, I mostly use the K3, and I have a choice of 3 amps (the above plus
> KPA500), so solving the 'Where do I put the TX Delay' question would be a
> help to put my mind at ease.
>
> Ralph, VE7XF
>
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