On 10/18/2020 5:51 PM, Steve Sykes wrote:
> You should also set a TX delay of at least 10 ms in the K3S, so of
the solid state amps require more, maybe 20 ms
That depends a LOT on the amp. I'd RTFM for the amp before setting that
much delay, which is usually limited by antenna TR switching. TenTec
made one (maybe the first) solid state ham amp, and all of their amps
used vacuum relays for antenna switching. They switched in less than 8
msec. K4XU, designer of TenTec's tube amps later worked for Alpha. The
86 and 87A were the last he did for them. They used diode switching,
which is very fast. And in bar conversation, he made a point of saying
that he designed the RF section, not the control circuitry.
I operated two of his TenTec Titan 425, bought used (their first legal
limit tube amp) in my station for about 12 years of heavy contesting,
until my purse got heavy enough to replace them with a pair of used
87As, and this past summer, one of the 87As became a spare for a KPA1500
(so I could get legal limit on 6M). Elecraft amps also use diode
switching for antennas.
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
Message delivered to arch...@mail-archive.com
