Don,
I use an external vacuum relay for compatibility with my old tube
amplifiers. The whole system long predates the KPA1500, and I still
sometimes use the tube amplifier. The system also includes small relays
for switching receiving antennas and protecting the receiver. However,
even without relays, in QSK there's sound from the receiver between
characters, of course, which I sometimes prefer not to listen to. This
works fine with the K3, as in QSK/VOX mode closing the PTT circuit
simply keeps it in transmit mode. My old FT-1000D doesn't work that way,
and it's a pain: if you close the PTT circuit in QSK mode, you get a
carrier. I'm glad the K3 doesn't work that way.
73,
Scott K9MA
On 4/24/2019 09:12, Don Wilhelm wrote:
Scott,
What do you mean by "if I get tired of all the racket"?
The Elecraft gear is all electronic switching for T/R, so no relay
clacking racket. That is true for ALL Elecraft gear, even the oldest K2.
That may not be true for your old tube amplifiers, but the original
question was about a K3 and a KPA1500, so no relay clacking could be
present.
73,
Don W3FPR
On 4/24/2019 9:52 AM, K9MA wrote:
I know this will seem incredible to the software purists, but I have
an actual mechanical "switch" in series with the PTT line. The K3 is
always in QSK mode, but if I get tired of all the racket, I can just
turn on the PTT. That seems to work flawlessly with the KPA1500, as
well as my old tube amplifiers. (There's another switch in the keying
line, just in case the computer goes nuts. Of course, that could
NEVER happen.)
73,
Scott K9MA
--
Scott K9MA
k...@sdellington.us
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