I have GPS antennas 500 feet directly under my HF antenna running full legal limit. And GPS OCXO's in the shack just feet away from the legal limit amplifier. Never ever a problem.
Now my 35-year-old garage door opener... it went bonkers when I got my big boy amp and used it in a big RTTY contest! My wife came to me shortly after the contest started and wondered if maybe I had something to do with the fact the door was going up and down continuously for the past hour. After the motor and starter cap blew up, I got a brand new garage door opener, and it does a lot better when I'm transmitting :-). Tim N3QE On Thu, Apr 14, 2016 at 5:01 AM, Pete Stephenson <[email protected]> wrote: > Hi all, > > I recently acquired a pair of Symmetricom 58532A antennas and so far > they work great with my setup (antenna --> Symmetricom 58535A splitter > --> [1] Thunderbolt and [2] other receivers that I swap out > occasionally). > > I'm also an amateur radio operator and am looking to mount the 58532A > on a roof-mounted mast to get better coverage (right now it's outside > a window). Would the presence of nearby (either on the mast or within > 20m of the mast) HF (3.5-30MHz) , VHF (~145MHz), and UHF (~430MHz) > transmitters cause any issues? My transmit power is typically around > 5-20W on HF with peaks up to 100W and 1-5W on VHF/UHF. The HF antenna > is a simple wire dipole, not a high-gain directional antenna. > > Naturally, I'd like to avoid damaging my GPS antenna or any of the > downstream devices. > > Since the 58532A is currently mounted relatively close to the > splitter, I'm using LMR100A coax (it's lossy, but the short lengths > mean it's not an issue; the window mount makes the thinness of the > cable important) but for the longer run from the mast I'd used LMR240 > or LMR400 as needed. I use the same type of cable for the HF radio. > Those cables are well-shielded (braid-on-foil) with >90dB shielding > attenuation, so I don't think signal leakage from or ingress into the > cables will be a big deal. > > The datasheet for the 58532A specifies the out-of-band signal > attenuation is around 60dB at +/- 50MHz. > > Many thanks in advance for the help. > > Cheers! > -Pete > > -- > Pete Stephenson > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
