Re: [TenTec] Omni VII: RF in TX Audio

["Gary Hoffman" <ghoffman@spacetech.com>]

Jerry,

Can you suggest an appropriate compound ?  Perhaps a source of same ?  I 
suppose the big suppliers have most of this stuff available.
Its not so easy to find any more - guess cause the Ham market has gotten so 
small.
73 de Gary, AA2IZ


----- Original Message ----- 
From: "Dr. Gerald N. Johnson" <geraldj@weather.net>
To: <tentec@contesting.com>
Sent: Sunday, October 25, 2009 11:13 AM
Subject: Re: [TenTec] Omni VII: RF in TX Audio


> On Sat, 2009-10-24 at 19:59 -0600, Stephen Cannon wrote:
> > Alan,
> > I was wondering about the ferrite materials.  My initial thought was to 
> > use
> > 31 Material (because Material 31 is designed for HF); however, I further
> > thought that noise in other frequency ranges (other than HF) may affect
> > signals within some of the electronics.  Should I just stick with 31
> > Material on HF receivers or do you have additional suggestions?
> You want a lossy material at the subject frequency, not one used for
> transformers at the frequency to be filtered. Typically that means a
> considerably higher permeability for the noise filter toroid than a
> transformer toroid.
>
> 73, Jerry, K0CQ
> > Stephen AD7TD
>
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