alex wrote:
> Usually, we do not need QSK. And the sequencing is done by the processor so
> it comes "free".
> It is easier to integrate the named relay than a vacuum one. This is not to
> say we are not using, now and then, a vacuum relay :) However, most of
> our units must be tested at 50Gs sinusoidal and we have not found
> yet a VR to survive 30Seconds in this test.
I know I'm going to get crucified by Steve for posting off-topic again, but I
can't resist. My point was that as long as you're going through all this trouble
of replacing the relay and building a sequencing circuit, you might as well
replace it with a full QSK circuit for a few more dollars and a few more minutes
of work. Saying that "we don't need a QSK' would be like saying that we don't
need a Mercedes (if it costs only $10 more than a Geo).
Also, I don't know who "we" is, and I don't understand what this "50Gs
sinusoidal" test has to do with the home made ham radio application.
And last, but not least, to make it on-topic again, I don't agree with your
philosophy of using a microprocessor circuit for the antenna switching box that
is to be mounted on top of the tower. This box should be as simple as possible
(minimum # of parts, i.e. relays, diodes, bypass caps and MOV's, nothing else)
so the failure rate is reduced to a minimum. Nobody wants to climb a tower to
reset a CPU or to replace a dead transistor. Then there's a leakage of harmonics
right below your antennas, etc. I would much rather have a good old-fashioned
analog wiring going to that tower than messing with static sensitive electronics
100 feet in the air.
73 ....... Zoran WA7AA
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