Topband: Feedline BOG effect

[Bill Tippett]

KV4FZ:

 > With 10 Beverages I am running out of good large Ferrite Rings and 
resorted even to large solenoid spools of RG-6 which according to 
W8JI's comparisons really is not as perfered as other methods. .....I 
wonder if there is a simple solution that some one has the equipment to test.

         A simpler and much less expensive solution is a 1:1 
transformer which breaks the coax shield (i.e. the common mode 
path).  DXE sells their RFCC-1 for $64.95 but you can make one 
yourself with one 43 cent mix 73 binocular core.  DXE's is more 
complex because it allows sending DC control signals over coax 
through it.  If you don't need that capability, simply wind 2 turns 
per side, ground the shield of the longer coax run to a ground rod 
and leave the other side floating.  ON4UN calls this approach a 
"braid breaker".

                                         73,  Bill  W4ZV