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[TowerTalk] HyGain AV640 Toroid core mix, or Beefing up an AV640

To: TowerTalk <>
Subject: [TowerTalk] HyGain AV640 Toroid core mix, or Beefing up an AV640
From: "Roger (K8RI)" <>
Reply-to: "Tower and HF antenna construction topics." <>
Date: Sun, 04 Apr 2010 21:51:41 -0400
List-post: <">>
Any one have any idea as to the core mix used in the AV640 baluns?  It 
has two in the matching network. One is a current balun and the other a 
4:1.  Then they use a series cap to tune out the reactance of the 
slightly long antenna.
The is designed for all ham bands from 40 through 6 meters. Power is 
limited to 1.5KW PEP 40 through 10 and only 200 or 300 watts on six.

I'm assuming that either the core material and/or the series cap is what 
limits the power on six.
As the power is also limited for RTTY/Digitl 40-10 I'd assume it needs 
some larger (or more cores) to handle the heat in the 4:1 balun and 
probably the current balun as well.

I'd like to beef this thing up so it'll take 1.5KW for any mode, 
although I don't know of any mix that will let me do it over the entire 
range of 40 through 6 meters. I'd also feel a bit more comfortable 
running it the legal limit contest style although it's a back-up antenna.


Roger (K8RI)


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