[TowerTalk] 220v trench proximity to 7/8" feedline trench?

[john at kk9a.com]

I have also not experienced noise issues on HF with A/C lines near 250' to
350' underground runs of Heliax. Heliax shield is corrugated copper tubing.

John KK9A


Steve Maki wrote:

I have some some 120V AC lines in the same conduit as my rotator and 
relay control lines, with direct buried Heliax just above and below the 
conduit (up to to 500' runs), and have not noticed any issues. Normally 
I only energize the AC when I need to do some soldering or run a capstan 
winch out there, but sometimes forget to flip the breakers off for 
extended periods.

-Steve K8LX