[TowerTalk] Need help to select ferrites for UHF "baluns"

[Dan Hearn]

Rob, you do not seem to be getting any help so I will give you some
suggestions.
1. Get the Fair Rite catalog at
http://www.fair-rite.com/cgibin/catalog.pgm#select:freq1
2. Select suppression, then cables, then round cables.
3. At the top select 200-1000mhz, type 61.
  When you select a core size and click on its type number you will get a
page which shows a graph with R , Z, and X versus frequency. You need
several thousand ohms resistance for legal limit power. You can series
enough cores to get this value. You can get split cores if you wish or
solid ones. This should get you started to designing the chokes you need.
Mouser and others sell Fair Rite cores.
73, Dan, N5AR

On Mon, Jul 16, 2012 at 4:51 PM, Rob Martin <rgmrob at yahoo.com> wrote:

> I need to make "baluns" for 70cm and 23cm, something to thread over the
> coax to stop RF currents on the outside of the shield.
>
> I need something to go over a Type N male (ferrite ID >= 23.8mm) and
> directly over the coax (ferrite ID >= 13.8mm).
>
> I'm sure someone here has taken lots of care to choose the best ferrite
> for the job. I would appreciate some suggestions, components to use and
> components to avoid.
>
> Thank you.
>
> Rob
> AE7EG
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-- 
Dan Hearn
N5AR