[Amps] Ferrite Core for 160M PI Output ?

[Jim Thomson]

Date: Tue, 13 Jun 2017 12:10:33 -0400
From: "JC" <n4is at comcast.net>
To: "'Peter Voelpel'" <dj7ww at t-online.de>, "'Chris Wilson'"
<chris at chriswilson.tv>, <amps at contesting.com>
Subject: Re: [Amps] Ferrite Core for 160M PI  Output ?

<Hi Peter

PI network loss is related with the Q of the inductor, you need material #2
or #6 ( better stability with temperature), #61 #77 are good for BALUN or
chokes and not good for inductors with high Q.

73
N4IS
JC 


##  He is talking about 136 khz.   Dunno what the correct powdered Iron core is at that freq. 
#2 powdered iron cores  may be as good as it gets.   

##     #61 ferrite is  UHF material and semi useless for an HF balun.    #77  ferrite is out of vogue
these days for HF baluns.....even though Hy-hain still uses it on their  BN-4000 balun. 
Both have been replaced with type 31 ferrite. 

Jim   VE7RF