[time-nuts] Can a Symmetricom 58532A antenna and ham radio transmitters coexist?

[Mike Feher]

My HP has been on top of the roof for about 15 years. I have a 2 meter antenna not far from it with about 200 watts and on half of a 160 meter inverted vee slightly higher above it, running full legal power. Never had an issue. 73 - Mike 

Mike B. Feher, EOZ Inc.
89 Arnold Blvd.
Howell, NJ, 07731
732-886-5960 office
908-902-3831 cell

-----Original Message-----
From: time-nuts [mailto:time-nuts-bounces+mfeher=eozinc.com at febo.com] On Behalf Of William H. Fite
Sent: Thursday, April 14, 2016 9:07 AM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Can a Symmetricom 58532A antenna and ham radio transmitters coexist?

Good morning, Pete. My 58532 antenna is about 10 meters away from a UHF/VHF vertical through which I run up to 50W and about 25 meters from an HF magnetic loop which I feed with up to 500W.

I have had no issues with the Symmetricom antenna or the T'bolt that it feeds.

Bill
KJ4SLP



On Thursday, April 14, 2016, Pete Stephenson <pete at heypete.com> 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