Topband: common mode choke at the tuner or amplifier

[Dennis Peterson]

How many turns required and what diameter form would be required for coax style 1478 which is basically QUAD SHIELD of 2 braids and 2 foils each silver plated with a #12 silver plated center conductor?

I already have one common mode choke at the antenna (inv-L) feedpoint using the same coax and the common mode choke wound on a 4.5" diameter PVC form using 12 tunrs.  The coax length is 40 feet plus 20 feet or so in order to make up the turns on the coil.

I want to place one at either the tuner or amplifier output.  Is this necessary or is this over kill?  

If there is a chart that shows this or describes this, I'd like to obtain a copy.

Thanks in advance

de K0CKDennis






Dennis G. Peterson
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