----- Original Message -----
From: "Bill, W6WRT" <dezrat1242@yahoo.com>
To: <amps@contesting.com>
Sent: Tuesday, October 26, 2010 8:42 PM
Subject: Re: [Amps] construct ferrite "line isolator"
> ORIGINAL MESSAGE:
>
> On Tue, 26 Oct 2010 17:30:49 -0400, "Carl" <km1h@jeremy.mv.com> wrote:
>
>>
>>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 informaton 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
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