[TowerTalk] Feedline (choke) question

[Brian Beezley]

Here's another offbeat idea. If you have an effective grounding point 
nearby, you may be able to shunt unwanted residual shield current to 
ground. The coax need not be severed. However, I would not trust my 
skill at making a watertight connection to the shield after slitting the 
outer cover to get at it. And what if the spot is not near a good 
ground? An alternative would be to install two quarterwave wires 
perpendicular to the coax. Lay them on the ground. To avoid a direct 
connection that exposes the coax to the weather, wrap the center of a 
halfwave wire around it to capacitively couple the two arms. The wire 
would need to be lengthened to maintain resonance. This is a single-band 
system. I don't think I'd want this up in the air, but if it was on the 
ground in a spot without foot traffic it might be OK. I'd model it and 
as much of the RF environment as I could using realistic ground 
constants to see how well it might be expected to work in a particular 
situation. On the other hand, if the coax was on the ground it might be 
worth the trouble to install connectors and a choke.

Realistic ground constants:

https://k6sti.neocities.org/hfgc

Brian