[Elecraft] KX3 Computer Interface for digital modes

[Jim Brown]

On 7/29/2012 12:20 PM, Igor Sokolov wrote:

> I had to build small circuit that makes use of inhibit signal in  my 
> K3 to extend rigid 8 ms built into K3 although it would be more 
> logical to have programmable TX delay built into the transceiver.

Hi Igor,

First, I suspect we may have a language problem. The 8msec delay is only 
a STARTING point, and is ADJUSTABLE from a menu. You can set it to be 
much longer.

Second, in MOST SO2R applications,, relays controlling bandpass filters, 
selecting antennas, selecting amps, are switched when the operator 
CHANGES BANDS, not when he goes from TX to RX.  Certainly special 
lockout circuits of the sort you're talking about CAN require a bit more 
delay and will require PTT.  But I would bet a case of your favorite 
beverage (the drink, not the antenna) that for every station doing 
things like that there are at least 100 who are simply turning on and 
off the TX that either runs barefoot of feeds a power amp that feeds 
antennas that are switched when the operator changes bands.

If YOU want to use PTT to control your switching please do. But do not 
insist that the other 99% of operators who don't use it. For them, VOX 
works just fine.

73, Jim K9YC