[time-nuts] Need recommendation for GPS antenna for Oncore GPS module

Matthew D'Asaro medasaro at mit.edu
Sun Nov 4 12:39:54 EST 2018


For what it is worth, I got a used HP/Symmetricom 58532a antenna off of eBay for about $50. It needed a minor repair (broken internal coax) but once that was done it has worked great for me. The other one I considered was the 58504a but they were more expensive on the used market and didn't seem as weather proof (a special weather proof cap was offered as an add-on but most don't have it) so I went with the newer 58532a.

-Matthew D'Asaro

> On Nov 4, 2018, at 8:43 AM, Toby Riddell <toby.riddell at prevtec.com> wrote:
> 
> Thanks Scott - I will look into getting one of those. And noted re. the
> roofline!
> 
>> On Sun, 4 Nov 2018 at 07:26, Scott McGrath <scmcgrath at gmail.com> wrote:
>> 
>> For timing use ideally it should be above the roofline by at least several
>> feet otherwise satellites close to the horizon will be not be visible.
>> 
>> The generally preferred antenna is the Agilent/Keysight/Symmetricom.
>> 58504A antenna also any outdoor antenna made by Trimble or TrueTime as long
>> as antenna does not use a downconverter.
>> 
>> 
>> 
>> On Nov 3, 2018, at 5:26 PM, Toby Riddell <toby.riddell at prevtec.com> wrote:
>> 
>> Hi all,
>> 
>> I want to fit a GPS antenna on our house (the attic is being renovated and
>> it just occurred to me that if I move fast I can get it done before the
>> walls are closed up again!)
>> 
>> I was planning on having it mounted on a south-facing wall but below the
>> roofline - does this sound okay for picking up satellites? It can poke
>> above the roofline if needed as long as the mounts are on the wall (not the
>> top of the roof).
>> 
>> Is there a recommended antenna? I am planning on feeding it into an Oncore
>> GPS module which will then interface to a Soekris net4501 running nanoBSD
>> and ntpns.
>> 
>> Thanks!
>> 
>> Toby
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