Jim DiMauro [EMAIL PROTECTED] made an utterence to the drakelist gang
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Hi All:
As some of you may recall, I solved my AM filter problem last week, but then
I found a bad CR1402 PIN diode (one of the two low power diodes that looks
like a two-ledgged transistor, mounted on the front HPF board). I had
tested the other PIN doides and found all of them to be OK.
The odd thing is that I had no clue that I had a bad diode. Thhe radio
played well without a clue to any probelms. I only checked the diode as a
side issue to a birdie problem at 14.340 and the AM filter thing. Well, I
replaced the diode last night, and there's been absolutely no change in
equipment performance that I can see. The birdie is still there, but that's
not enough of a problem for me to tear into the radio and chase it down.
The radio showed no sign of malfunction or degraded performance anywhere
before of after the diode change, so I wonder what was up with the diode?
Certainly a failed PIN diode would have caused something that I would
notice. The closest thing to a performance issue I found is reduced power
output on the 15 and 10 Meter bands, but that's usually the case with HF
rigs and I don't think that's a problem (I get about 100 Watts out on 15
Meters and 75 Watts or so on 10; 150 Watts everywhere else). No change in
power before or after the diode change. So, unless someone thinks there's a
problem lurking somewhere inside my TR-7, I'm going to leave it be and
continue to enjoy it.
Thanx to all for your input.
73,
Jim
WA2MER
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