I have multiple GPS antennas, an HF ground plane and a long wire. I typically run no more than 100W on HF, but am capable of pushing to 500. All the antennas are within 30-40 feet of each other.
Personally, I've never had an interference problem between any of them. I use LMR240DB (Direct Burial) for the GPS runs, and LMR400DB for the HF's. Yes, the filling goo can be a hassle, but at least it is easily removed with the citrusy-smelling solvent (darned if I can remember the name of the stuff at the moment). The extra water protection and UV resistance are well worth it, at least to me. If you're really paranoid, rdr-electronics on Ebay has lots of NIB High-Rejection rated GPS timing antennas, made by PCTel/MaxRad for Lucent. They are expressly designed for use in high-RF environments and contain extra filtering. The item number would be 231898765036, going for $30 + shipping last I looked. The manufacturer part number is GPS-TMG-HR-26NCM, Lucent P/N KS24019-L112D, ComCode 849143987. The collar takes a 1.5 inch mast. No connection with rdr on my part, other than being a very happy customer of theirs for the last several years. Keep the peace(es). On 14-Apr-16 02:01, Pete Stephenson 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 > -- --- Bruce Lane, ARS KC7GR http://www.bluefeathertech.com kyrrin (at) bluefeathertech dot com "Quando Omni Flunkus Moritati" (Red Green) _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.