[Milsurplus] Radio suppression on WWII radio jeep

[aGEnuine ham]

Mark:

This forum is not the place to try to cram a full measure of 1940's
automobile electrical information into, but that is what you need to
fully understand all the aspects of the problem.  For example, the
WO-A-8883 filter you mention which connects to the field terminal of the
regulator has a resistor in series with the capacitor, and even then it
tends to shorten the life of the regulator.  Using a 0.5 mf capacitor
there will destroy the regulator (weld the contacts) and subsequently
quickly wipe out all the remainder of the electrical system.  See if you
can turn up a CQ Mobile Radio Handbook from the 50s, which, IIRC, covered
what you are asking pretty completely.  The capacitors used were sized to
provide maximum supression in each location, which is dependent on the
wiring size and length, and characteristics of the noise source, and were
coaxial where the current went in one end and came out the other and the
outer metal shell is grounded so there was no inductance in the bypassing
at all.  I don't know where you buy them anymore, since the American
electronics industry has self-destructed, but Sprague used to be a major
supplier.

73,
George
W5VPQ

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