Roy Lewallen wrote:
SNIP
2. Put a common mode choke in the power cable to the rig.
Because the wires are pretty large, it's probably not
practical to wrap multiple turns around a single ferrite
core. So get some large clamp-on cores you can clamp over
both conductors at the same time. It's likely to take a
dozen or so, or more depending on the type of ferrite.
I recommend type 43, or 70-series if you can find it in clamp-on cores.
3. Apply the same kind of choke to the inverter power leads from the
battery.
A source of supply of 'big'! toroids for this kind of
suppression is the deflection coil toroid from old
TV sets. Some of them are enormous! And cheap. (read - free)
I use them round the shack liberally. There is enough
ferrite in there to equal 10 small toroids. (by weight)
Cheers.
Murray vk4aok
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