on 12/2/99 9:18 AM, EDWARDS, EDDIE J at eedwards@oppd.com wrote:
> [Ed-K0iL] I disagree Jon. I have not found 77 mix to work very
> good at all across the HF bands where 43 mix almost always has worked for
> me. This is all very anecdotal, but the numbers that the Palomar guy quoted
> seem to match my experience with them.
>
> I have tried 77 mix on audio rectification problems from 14 MHz
> signals and it had absolutely no effect. (I actually thought it might've
> been a little worse!) Whereas the 43 completely eliminated it using same
> size toroid.
>
> Have you really had good results using 77?
Well, I just found some of the paperwork from my order from Amidon on
ferrite material. Type 77 is indeed what I bought and what Earl at Amidon
recommended for frequencies up to 30 MHz. I have the large cores with on my
speaker wires, TV, etc. and it does indeed work well. Could I have gotten
away with fewer cores, wraps, etc with type 43 material? I have no idea. I
was using what the engineer told me to use. Why would it benefit Amidon to
sell material 77 over 43 if it was the wrong thing?
So yes, I would have what I call is good success with Amidon's Type 77
material.
73,
Jon
KE9NA
--
-------------------------------------
Jon Ogden
KE9NA
http://www.qsl.net/ke9na
"A life lived in fear is a life half lived."
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