Tom,
That is exactly the point - 20 ms is often not enough time to change
antennas and protect the preamps located on the tower. My CW PTT
addition to the K2 does provide a 'TX-enable' function and has found
application in several VHF installations that I am aware of. It is also
used in at least one SO2R HF installation to steer the active transmitter.
Yes, the best answer is to convert the remote switching to happen in
that 20 ms or less, but that is impractical with many many VHF
installations.
QSK is NOT important for that type of VHF operation, and in fact may be
undesirable.
73,
Don W3FPR
Tom Hammond wrote:
I think the K3's present pre-keying is about 20 mS, but I may be off
there.
Does VHF operation require a significantly longer set of pre-keying
signals? And if so, how many are required to sequentially key the down-
stream devices?
And, is it the concern that one of the down-stream devices might be so
slow that it doesn't get switched in time, so there must be a sequencer
present to ensure that EVERY device HAS actually been switched before
the K3 would be allowed to generate RF? I guess QSK is NOT of any
concern when operating on these bands... right?
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