[TowerTalk] K9YC Choke Cookbook Question

[Wes Stewart]

At the time I made the original measurements my instrumentation (HP-8510) had a 
low frequency limit of 45 MHz and I had a space limitation.  Consequently, I 
couldn't measure at the frequencies where ladderine is commonly used.  Because 
of the remarkable march of technology, I now have both N2PK and DG8SAQ Vector 
Network Analyzers that can measure at lower frequencies with commensurate 
accuracy.  I also discovered that I have a spool of ladderline I acquired years 
ago at a swap meet when I still thought using it was a good idea.

So, when I get around to it and have a balun, or two, useful at a MHz or so, I 
will measure this stuff.  I have determined that it uses 18 AWG Copperweld but 
don't (and maybe never will) know how thick the copper is.

Wes, N7WS

   On 2/5/2017 11:32 PM, Dan Maguire via TowerTalk wrote:
> 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
> _______________________________________________
>