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 ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
