No subject

> On Jul 11, 2022, at 8:49 AM, skipp Isaham via time-nuts <time-nuts at lists.febo.com> wrote:
> 
> Hello to the Group, 
> 
> I'd like to get some opinions and war stories regarding GPS reliability at 
> high RF level and elevation locations. 
> 
> Background:  Three different hill-top GPS receivers, all different types, using 
> different antennas mounted on an outside fixiture, plain view of the open sky, 
> all stopped working. 
> 
> Test antennas were brought in and placed on a fixture well away from the 
> original antennas, the recevers went back in to capture and lock. 
> 
> From what I understand, the original antennas are what I would call straight 
> preamp with no pre-selection / filtering.  
> 
> The ordered and now inbound replacements are said to contain a SAW filter 
> system. It is the intent of the client to just place these "improved antennas" in 
> to service and get on with life. 
> 
> I would suspect a GPS antenna (and receiver) could be subject to RF overload 
> or blocking, however, we're assuming nothing major has changed at the site, nor 
> any nearby location.  One might think there are more GPS receivers being pushed 
> out of reliable operation by the world around them, I'm just not hearing those stories 
> from a lot of people using them (GPS receivers). 
> 
> Any new install GPS receiver antenna ordered will/should contain some pre-selection 
> to potentially avoid a problem, even some years down the road? Seems like that's 
> where things are going... no more off the shelf, wide band, (hot) preamplified GPS antennas 
> in busy locations? 
> 
> Thank you in advance for any related comments and/or opions ... 
> 
> cheers, 
> 
> skipp 
> 
> skipp025 at jah who dot calm 
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