[Elecraft] rf torroid

[John J. McDonough]

The red ones are generally used for the lower HF.  Generally for 20 meters
and up people use the yellow ones.  Of course, it depends on the
application.  A lot of people prefer the white ones in VFOs because they
have a lower temperature coefficient.  The red ones are actually good for
the whole HF range, but the yellow ones have a little lower inductance per
turn, which can make it a little easier to get the right inductance at the
higher frequencies where you usually want a lower inductance.  The yellow
ones also have better temperature stability and perhaps a little better Q.
But they don't work below 10 MHz, so for 30 meters and down, people usually
use the red ones.

72/73 de WB8RCR    http://www.qsl.net/wb8rcr
didileydadidah     QRP-L #1446 Code Warriors #35

----- Original Message -----
From: <ham_tech@juno.com>
To: <elecraft@mailman.qth.net>
Sent: Monday, June 03, 2002 2:50 PM
Subject: [Elecraft] rf torroid


> Hi,
>
> I think that the RED circular toroids, are used for the HF range of
> frequencies.   Correct me if I am wrong.
>
> Daniel
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