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

[Bruce Lane]

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.

Re: [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@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 <p...@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

___
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.

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

[Artek Manuals]

Pete

The reality is there are almost two many variables to predict the outcome

1) Proximity of the ham antennas vs the GPS antennas (obviously farther 
away is better)

2) Polarization of the ham antennas may or may not play a role
3) Direction the ham antennas is pointing. Pointing away from the GPS 
antenna is typically better.

4) Power levels , which in your case are modest
5) How "clean" the ham transmitters are (harmonics, spurs etc)
6) a direct harmonic at a  particular VHF/UHF freq  which appears in the 
pass band of the GPS receiver I haven't done the math  but you might 
find you have a problem at 145.60 but not at 146.90 as an example



My guess is your unlikely to have much problem with at least 10' of 
separation between the ham antennas and the GPS. In my prior location  I 
was running a KW on HF and 20-50 watts on VHF/ UHF and 10W on 1296. My 
GPS antenna was on the same tower about 20' below the ham stuff . I had 
two GPS antennas the 58532A and a Motorola ( cant remember the number) 
and I never had a problem YMMV


Dave


On 4/14/2016 5:01 AM, 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




--
Dave
manu...@artekmanuals.com
www.ArtekManuals.com

---
This email has been checked for viruses by Avast antivirus software.
https://www.avast.com/antivirus

___
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.

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

[Tim Shoppa]

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  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 -- time-nuts@febo.com
> To unsubscribe, go to
> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
> and follow the instructions there.
>
___
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.

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

[William H. Fite]

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  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 -- time-nuts@febo.com 
> To unsubscribe, go to
> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
> and follow the instructions there.
>


-- 
Sent from Gmail Mobile
___
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.

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

[Pete Stephenson]

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 -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.