The short answer is that coax should be fine inside conduit, provided that the source and load are actually unbalanced.
All the fields should be inside the coax, between the inner side of the outer shield and the inner conductor. However, if you, for example, connect a coax to a balanced antenna such as a dipole without a BALUN, or if the antenna is not tuned to the operating frequency, then RF may appear on the outside of the coax. If there is any, then nearby metal like the conduit can screw up the SWR, and in addition, the coax can pick up nearby interference. Of course the above is likely only really true if the coax shield is 100% coverage, perhaps with a foil wrap plus copper. Electrostatic coupling should show up on the outside of the shielf, and not find its way to the receiver. Magnetic coupling will mostly show up as currents on the outside of the shield, but in the absense of full coverage, it may also excite some currents on the inner conductor. I run coax through PVC conduit, to a remote antenna tuner mounted outside the house. It seems to work OK. -Larry K4EO > On Jun 12, 2024, at 11:45 AM, Jerry Moore <je...@carolinaheli.com> wrote: > > I have 30' run through my basement and want to eliminate potential > interaction between the coax and power wires in the same area (don't ask). Is > there any problem running coax for HF through metal coax? > Thanks in advance. > Yes, I decided to keep my K3S. > > AE4PB > Jerry Moore > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:Elecraft@mailman.qth.net > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > Message delivered to l.elecr...@stewart.org ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
