A 6 mix iron powder is good for 6-10M, I use it as the L in the input pi
>>network for amps. If it works for you for HF RFI than thats good, Id guess
>>it wasnt too severe and just a little bit of impedance did the job.
>
> REPLY:
>
> The Palomar data sheet says #6 is good for 2-30 MHz.
>
> http://www.palomar-engineers.com/Iron_Powder/iron_powder.html
>
> Where did your information come from? Perhaps different manufacturers use
> the same number for different mixes?
>
> 73, Bill W6WRT
Straight from the Micrometals spec sheets and then some testing. There is a
huge difference between using it in a SS HF VFO and with actual power with
much larger wire which limits the low frequency. The 6 and now the 7 mix is
very stable compared to the 2 mix and popular with the QRP crowd. OTOH the 2
mix is the "standard" in 1.8-30 MHz 4:1 baluns....far from perfect but
useable.
Palomar makes nothing besides CB amps and little accessories, they buy from
Micrometals the same as I do.
Carl
KM1H
## we are talking apples and oranges between ferrite + iron powder !
## sure, 2 mix iron metal will work for toroid cores for 160/80m tank coils
in a linear..and that's abt it. Wind a bunch of turns on 2 mix, and ur
lucky to
get 8-12 uh.... which is plenty of uh for a low freq tank coil..but hardly
enough
for rfi suppression. 4 x wraps of RG-393 through 4 x 2.4" OD, type 31
torroids yields aprx 132 uh. 17 x 1" diam x 1" long type 77 beads slid over
RG-393 yields 63 uh....[and 38 uh if type 43 used].
## powdered iron is abt the most useless thing there is for RFI
suppression...unless
you use a case load of it.
Jim VE7RF
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