[Elecraft] Attic Antenna

[N2EY at aol.com]

In a message dated 10/27/06 4:38:23 PM Eastern Daylight Time, 
rohre at arlut.utexas.edu writes:


> The Diamond bottom tube may, (and likely) contains a broad band ferrite 
> cable choke.  

Probably - to keep RF off the outside of the coax. Such a choke would cost a 
few dollars at most.

Or there may be a combination trap/ loading coil such as used 
> 
> on some tri band beams for multibands.
> 

No, that wouldn't work.

Traps are used in the radiator itself, not at one end. 

The BB7 claims SWR of less than 2:1 over the entire range. Traps and loading 
coils won't do that.

It's resistively loaded. 

73 de Jim, N2EY