[time-nuts] Re: GPS Elevation Mask Values.

[Dan Kemppainen]

Hi,

Still trying to sort out the cause of that 'finger' of signal.

Hooked up two more different GPS modules. A ZED-F9P, and a Jackson Labs 
LTE-LITE eval board.

The F9P sees the same finger in the north as the other Ublox GPS module. 
The Venus receiver in the LTE Lite does not report signal above the 
north pole. See attached images.

The data for these images was all recorded concurrently. All three GPS 
Modules are attached to a splitter on the same antenna, with nearly the 
same length jumper cables running from the splitter to each module.

Currently running the same test again with the Ublox Timing module, the 
LTE Lite, and an adifruit "Ultimate GPS Breakout board V3" (MediaTek 
MT3339).

Dan



On 11/11/2021 3:30 AM, time-nuts-request at lists.febo.com wrote:
> Message: 1
> Date: Wed, 10 Nov 2021 09:54:09 -0500
> From: Dan Kemppainen<dan at irtelemetrics.com>
> Subject: [time-nuts] Re: GPS Elevation Mask Values.
> To:time-nuts at lists.febo.com
> Message-ID:<aa2e648c-79b5-f680-e573-53da374e5957 at irtelemetrics.com>
> Content-Type: text/plain; charset=utf-8; format=flowed
> 
> Hi,
> 
> So, that finger of signal appearing above the north pole shows up even
> after the GPS survey is done. Any ideas on how to figure out what's
> causing that?
> 
> My first thought is to try look at it with a different model of GPS unit.
> 
> Is it possible it could be a signal reflection in the cable or something
> weird going on in the feed???
> 
> Another thought would be to log the GPS data, to sort out which birds
> the GPS thinks is up there. Comparing to where they actually are would
> help sort out what the signal might be bouncing off of.
> 
> Dan
> 
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