Further reading...
Looking at Fair-Rite catalog of toroids, mix 61 which seems to be very
popular and recommended for HF baluns, has a mu of 125, and Al (nH/T2) of
170 for a 2.4" dia core. The Arnold MPP core, which is Nickel-Iron-Moly has
same 125u and Al of 155 for a 2" core. I'm not sure what else would make
one better than the other...there must be more to it though.
Help
Paul
-----Original Message-----
From: Richard (Rick) Karlquist [mailto:richard@karlquist.com]
Sent: Tuesday, October 28, 2014 10:22 AM
To: Paul; towertalk@contesting.com
Subject: Re: [TowerTalk] 4:1 balun questions KT-34XA
Your choice of MPP is very unorthodox.
MPP = moly permalloy powder.
Generally, ferrite is used for baluns.
It is also used for some tuned circuits but powered iron has some advantages
for tuned circuits and is often used in that application. I've never seen
MPP used for RF. Can you tell us why you chose MPP? How is it different or
similar to "powdered iron"?
73
Rick N6RK
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