[TowerTalk] K9YC Choke Cookbook Question

[Dan Maguire]

As a follow-up to what Wes said, his measurement results were used to derive the Zo, VF, and loss data for Wireman ladder line as contained in TLDetails/Zplots/AutoEZ/SimSmith and a few other places.

Wireman #551 (18awg  solid   CCS):  Nom Zo=400, nom VF=0.902
Wireman #552 (16awg stranded CCS):  Nom Zo=380, nom VF=0.918
Wireman #553 (18awg stranded CCS):  Nom Zo=395, nom VF=0.902
Wireman #554 (14awg stranded CCS):  Nom Zo=360, nom VF=0.930

Values are not *exactly* what Wes reported due to some additional data analysis.

All of the above software packages adjust Zo and VF for frequency.  As frequency gets lower |Zo| goes up and VF goes down.  This applies to all transmission lines and Jim Brown has verified that with various measurements.

Dan, AC6LA