Topband: Fw: Re: Coax Choke Balun

[mstangelo at comcast.net]

All,

I purchase my Fair Rite 31 cores from Mouser. They stock clamp on as well as solid cores:

http://www.mouser.com/catalog/catalogUSD/640/937.pdf

Unfortunately, the only 2.4 OD core woth a large 1.4 ID is a 43 mix.

They also stock 61 mix which is good for baluns,

Since I only run 100 watts I use a teflon version of the thin RG174 coax ( I don't have the designation at hand) for my chokes.

Mike N2MS

----- Original Message -----

From: Russ Tobolic 

To: topband at contesting.com

Sent: Thu, 12 Nov 2009 13:49:13 +0000 (UTC)

Subject: Topband: Fw: Re:  Coax Choke Balun



Bill;

 

K4SAV mentioned that obtaining ferrite cores is sometimes a problem. Are you running high power thus the need for RG213?  I only run 100w and am using a clamp-on ferrite (mix 31) per K9YC's paper.  I use a Fair Rite P/N 0431173551 which allows me to loop 6 turns of RG8X through the internal 0.75" opening.  These are available from Newark as their P/N 96B5352 The cost is $5.28 each and there is no min order with Newark.

 

Russ, N3CO