Topband: Feedpoint of short RX vertical

[luc kerkhofs via Topband]

Jim,

I made a braid breaker by using a binocular core 73-202 with 2 turns  primairy and 2 turns on
secondary . The term braid breaker comes from John s latest edition of low band DX ing

I found that it is difficult to get signal levels identical on both elements when using it, so maybe better to use a good common mode choke at the feedpoint .

Luc
ON4IA


On Sunday, June 8, 2014 5:24 AM, Jim Brown <jim at audiosystemsgroup.com> wrote:
 


On 6/7/2014 12:13 PM, luc kerkhofs via Topband wrote:

> does it make sense to decouple the feedline
> at the feedpoint with a braid breaker ?

It DOES make sense to decouple the feedline. I've never heard of a 
"braid breaker." Under NO conditions should you open the shield == that 
prevents the shield from being a shield. The good ways to decouple the 
feedline are 1) a good transformer, a good common mode choke, and 
radials. See Chapter 8 of http://k9yc.com/RFI-Ham.pdf for winding 
guidelines for the choke.

73, Jim K9YC
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