Another question:
Has anyone ever monitored the B+ line voltage in the R-390A with a DVM and an
o'scope? If you have, what is the B+ voltage and peak to peak ripple voltages
at the terminals of C606A and C606B? An octal test socket will come in handy!
The cost reduction report does not mention what the B+ ripple is with the
L-C-L-C filter. They were obviously more concerned with reducing the R-390A
heat load. The original R-390 report mentions the maximum voltage variation of
about a volt in the regulated power supply and a ripple of 0.1 volts over the
line voltage limits. I didn't find any mention of the R-390A's B+ voltage
value or it's ripple amplitude in the cost reduction report. One would think
that this question would have been addressed long ago in the Pearls of Wisdom.
If it has, I didn't find it.
Any help appreciated,
Jim
Logic: Method used to arrive at the wrong conclusion, with confidence. Murphy
On Wednesday, July 16, 2025 at 01:09:24 PM CDT, Jim Whartenby via
Milsurplus <milsurp...@mailman.qth.net> wrote:
Does a Change 3 to TM 11-856 actually exist? I found TM 11-856.C1.C2.C4.pdf
which skips over C3. Does anyone know the story?
Regards
Jim
Logic: Method used to arrive at the wrong conclusion, with confidence.
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