You are mistaken. 25' of ladderline is only about a tenth of a wavelength and
does not invert impedance. I suggest you download Dan's TLDetails program:
http://ac6la.com/tldetails1.html and play with it. Put in what you think, or
have measured, the feedpoint Z is then select one of the Wireman ladderlines and
see what happens as you change the length.
You may find some data on zip cord as feeders, but I would avoid them like the
plague, particularly as you are trying to solve a problem that doesn't exist.
Wes N7WS
On 11/7/2017 7:08 AM, Michael Blake wrote:
My 80M antenna is a low, loaded dipole fed with balanced window line. As the
center impedance is low the high impedance window line tries to invert the
impedance to a much higher value. The feedline is only 25' long and
terminates in a 1:1 balun which is then connected to a remote autotuner via 24
inches of 9913F.
The question is:
Has anyone run any RF loss tests on the commonly available 12 gauge clear PVC
insulated "speaker" wire. The impedance would be quite low, probably in the
90 ohm range, and world certainly handle the applied power (500 watts) but I
have not been able find any information regarding RF loss.
Michael Blake
[email protected]
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