Topband: Phasing lines

[Jim Brown]

On 3/3/2020 7:30 AM, clive at gm3poi.com wrote:
> Hi all,
> 
> I wonder whether anyone has used LDF4-50A for phasing lines and verified the
> VF as being 88%. If not have you an idea of any spread on the VF.

This is a huge waste of money if your only concern is loss, which for 
any coax is quite low on 160M.
> 
> I want to use some where it could make the difference to cable length.
> However nothing will be assumed it will be measured. I note from the spec
> that
> 
> they give a tolerance of 5% but I doubt some how that the VF varies that
> much.  73 Clive GM3POI

Note that VF varies as a function of frequency. The published value is 
at VHF, where it converges. At 2 MHz, it is 1-2% less than the published 
value. This is an inherent characteristic of ALL transmission lines, 
predicted by the wave equations.

73, Jim K9YC