[Elecraft] [KAT500] Help with KeyLine Interrupt on KPA500 (Video)

[Dick Dievendorff]

I think your analysis is right, and in some cases the ATU cannot break or reconnect the key line while RF is present. We have KPA500 firmware in test that does this. It is on its way to public availability. 

73 & Merry Xmas
Dick, K6KR

Dick

On Dec 8, 2012, at 4:18, ke9uw <c-hawley at illinois.edu> wrote:

> The PTT is generated by the transceiver. The KAT500 passes it thru to the amp
> unless the KAT is tuning a high SWR. The problem is that the amp goes into
> fault before the KAT can OPEN the key line. Firmware in the KAT with some
> delay is not the answer...it's already too slow for the amp. If there is any
> programmable delay in the KAT, then a firmware change might be to speed that
> up if possible. But I doubt that it is possible since it's a relay opening
> in the KAT which requires some milliseconds.
> I'm guessing the only Elecraft solution is to delay the amp's response to
> the high SWR so it doesn't "Fault" giving the KAT time to open the key line.
> So the change in firmware we are waiting on is for the KPA amp.
> Help me if I'm missing something here.
> 
> 
> 
> -----
> Chuck, KE9UW
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