If possible run the coax perpendicular to the house wiring to keep any coupling to a minimum. This was my configuration in the drop ceiling of my former house. I ran legal-limit with no issue whatsoever. YMMV of course…
73, Mark NB1U On Wed, Jun 12, 2024 at 1:28 PM Fred Jensen <k6dg...@gmail.com> wrote: > OK. Lived for 38 years in a house started in 1925. Knob-tube wiring. > You can run coax in metal conduit but NOT with power wiring. If the > load on the coax is unbalanced, RF current will likely flow on the outer > surface of the shield and metal conduit will probably change the SWR. > [Because of the "skin effect" that confines alternating current to the > outer surface of conductors, coax really has three "conductors" ... > center, inner surface of shield, and outer surface]. I'd be surprised > if you saw any interactions with or without conduit but it would make a > run of multiple coax cables a lot neater. > > 73, > > Fred ["Skip"] K6DGW > Sparks NV DM09dn > Washoe County > > Jerry Moore wrote on 6/12/2024 10:05 AM: > > > > HIHI, the house was built in 1960 and the feeds are a huge bundle of > > wires loosely run across the ceiling of the basement INCLUDING a > > copper water pipe (cringe). I’m in the process of re-routing the water > > pipe and looking for a safer way to support the wires. Just a ton of > > work. My intent with the conduit is to keep HF/UHF/VHF around the coax > > from getting into the electricals or vice versa. > > > > *From:*Fred Jensen <k6dg...@gmail.com> > > *Sent:* Wednesday, June 12, 2024 12:16 PM > > *To:* Jerry Moore <je...@carolinaheli.com> > > *Cc:* Elecraft@mailman.qth.net > > *Subject:* Re: [Elecraft] Other: Can you run coax inside metal conduit? > > > > Yes. You said "don't ask," but what interactions are you attempting > > to avoid? > > > > 73, > > > > Fred ["Skip"] K6DGW > > Sparks NV DM09dn > > Washoe County > > > > Jerry Moore wrote on 6/12/2024 8:45 AM: > > > > 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 tok6dg...@gmail.com <mailto:k6dg...@gmail.com> > > > > ______________________________________________________________ > 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 mark.n...@gmail.com ______________________________________________________________ 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
