wrote in message
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I like to do business with fellow radio types, even if it costs a few
pennies more.

So do I, but Scotty indicated he wanted REASONABLE (his words). I
have just bought a number of them for a non ham application, and
depending on how many you need, the savings can be significant.


The absolute cheapest place to get ferrites has been the swap meets. In
Southern California, we have two that I know: Santee in San Diego and TRW
in Los Angeles. Tons of stuff -- old and new.

The problem is that the vendors often have donuts that are advertised as EMI
suppression ferrites, but they can't identify the mix. The mix determines
the frequency range, so if you try a Mix 43 donut at VHF, you may not see
the desired improvement.

I have a kit of ferrites that I bought for dirt cheap. Why so cheap?
Unlabeled, that's why. I take a shot with one donut and it does nothing, I
try another. For four bucks, I can tolerate some of this annoyance.

I just did a fix with one donut for RF getting into my computer keyboard on
PSK31. A few turns of the keyboard cord through a donut and the problem
went away. Luck and science married.

Could I set up a test jig to figure out the mixes and frequencies? Yes,
maybe. Give me some ideas for the test circuit. I have a 1GHz spec-an &
tracking generator.

"Sal"