[Elecraft] [KAT500] Tuning

[Igor Sokolov]

> The simple solution is to put the amp in standby, or push tune on the KAT 
> first, and then tune on the K3. I take it if you push tune first on the 
> KAT, then it will open the key line first so that the subsequent pushing 
> of tune on the K3 won't key the amp.
>
> Chuck, KE9UW
> Lionel Trains, TCA, LCCA, LRRC
> aka Jack, BMW Motorcycles BMWMOA #224

This simple solution may work for tune but what about the following 
situation:
Band 160m.
1810 kHz SWR = 1.5
1870kHz SWR = 6
KAT 500 was previously trained and remembers settings for both frequencies.
set up - K3+ KPA500 or any othrer combo capable of full break in
S&P in the contest, assisted. Click on 1810 spot and work station. Then 
click on 1870 and start to send in full break in mode. TXD on the radio is 8 
ms. T/R switching time of KPA500 is about the same or less. So far no 
problems. But now KAT500 needs to switch to 1870 setting. M/B timing of the 
relays used in KAT500 is 15 ms at best. So we have at least 7 ms of hot 
switching relays in KAT500 and possibly KPA500 switching to fault (or both).

73, Igor UA9CDC