Hello to the group.
My friend and I have a 75 Micor station on UHF that I was trying to
resurrect to donate to a young local ham that has a UHF machine that
needs to be replaced. The station in question was already in the ham
bands, 444.xxx tx, 449.xxx rx. The previous owner had trouble with the
PA dying all of the time, so he said, "get rid of it, I've had it with
this thing".
Well, I began to check this thing out and confirmed that the output was
non-existent. I threw another PA in and still no output. So, I checked
and tuned the circulator, checked and replaced the tripler/LLA, and now
I have a clean and healthy 2 watts out of the LLA to the PA. The
problem is, out of 5 different spares I have here, I get nothing, no
go, no outty putty. I have checked the power control logic wire and the
voltage seems to swing as it should during adjustment of the pot and
changes during tx. Voltage to the main PA feed is a solid 14.3 volts on
tx.
My question is: How much power will the Micor PA take for input if I
want to bench test these things? Can I just ground the PA control wire
during testing? What is the reccomended bench test arrangement.
I am having a bit of trouble believing that out of 5 spares, all are
bad. I know that one was soft, one other was intermittent, but I
thought that I had three solid spares.
Maybe Not! Maybe my coffee hasn't kicked in and made the brain get
going yet.
Thanks in advance. John
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