I've been telling hams for years that they can do a lot with small
chokes placed strategically in DC lines, but no, they'd rather blow
hundreds of dollars on the amighty ferrite miracle stuff.
I do one better, and just wrap the line into a loop while listening to
the radio (or watching a spectrum analyzer), then secure with a
bread-tie, stray string from a sock, or some such, when the noise stops.
Seems most everyone forgot the origin, and purpose, of the word, and
device, "choke".
Here was a simple fix... RFI from an LED light on the end of a 30'
romex run. Placing my hand over the bulb eliminated the RFI.
Impractical, but interesting. Running my closed hand down the romex to
around 6" - 10" also eliminated the RFI. Solution? A piece of wire,
connected to the junction box at ground potential, wrapped around the
romex in a spiral, out to about 10". A "choke", choking.
Kurt
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