[Elecraft] KAT500 Antenna Selection?

[Jim Brown]

On 10/10/2012 7:59 AM, Joe Subich, W4TV wrote:
> Most relays have significantly higher "carry" ratings than "switch"
> ratings and will not survive repeated switching at full power.
> While the KAT500 may be fast enough to switch during the "ramp up"
> time at the start of a transmission, that is still pushing the
> envelope - particularly if one is using it with a "legal limit
> amplifier".

This is prevented by the requirement that PTT be "looped through" the 
KAT500. When the KAT500 is tuning (or switching), PTT to the amp is 
interrupted. The only condition under which this does not work well is 
with an amp like the Titan, whose 30 year old logic won't allow 
interrupting PTT to stop TX because that would hot-switch the T/R relay. 
When using that amp, I transmit a dit or two (or tap the mic) to let the 
KAT detect frequency so that it can switch bands before I transmit "for 
real."

73, Jim K9YC