It's clear from the original description of the TM-D700 problem that
it's *not* alternator whine.
However, with respect to alternator whine:
I agree with the earlier comment that most of the easily available
filters and chokes (such as from Radio Shack) are not going to do the
job -- especially with the high current drains when a 50-watt rig is
transmitting. What I've found really simple to implement for my
various (Kenwood) 2-meter mobile rigs over the years has been to use
the inductance of the filament winding of an ordinary 10- or 20-amp
6.3-volt filament transformer in series with the positive lead from
the engine compartment. I then shunt the rig side of the filament
transformer winding with an old-fashioned 100uf 50VDC paper
electrolytic to the negative lead. Of course, the leads for the
primary winding of the transformer go nowhere -- they just get taped
up. The whole assembly has fit very neatly up under the heat ducts of
my dashboard in every car I've installed a 2-meter rig in. And it's
all been from junque-box parts -- I didn't spend a penny!
Bud, W2RU
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