[time-nuts] Regarding GNSS antenna radomes... (Motorola Timing 2000...)

[Ulf Kylenfall]

Regarding these:
It was disovered at the Onsala Space Observatory, that when using cones as radomes, the precisionof the timing/positioning signals was impaired by the uneven refractionof signals reaching the internal antenna structure from satellites of differentaltidudes/angles. 
This when using antennas from Leica. The internal structure of the offered items may of course be different.

At the Onsala Space Observatory, the cones was replaced by spherical radomeswhich improved the performance both for Swepos (Swedens nationalgeographic positioning system) as well as the support structuresused for geodetic VLBI.
A true time-nut will of course be exploring the use of spheres for his/hersown timing and frequency standard lab set up...

:-)

Cheers
Ulf Kylenfall - SM6GXV
SR Research Engr, (Ret)Onsala, Sweden.






  1. Motorola Timing2000 GPS “L1” Antenna (Gregory Beat)


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Message: 1
Date: Sat, 3 Aug 2024 09:45:39 -0500
From: Gregory Beat <w9gb at icloud.com>
Subject: [time-nuts] Motorola Timing2000 GPS “L1” Antenna
To: time-nuts at lists.febo.com
Message-ID: <A5EFC6E2-AF19-43B7-8BA1-7A2CDBF6C870 at icloud.com>
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These Motorola brand GPS “L1” antennas (circa 2000) have appeared on the Surplus market (used, eBay, elsewhere), as Mobile/cellular sites perform upgrades.
Prices / condition range from a Used few $$ to New in Box at $100 + .

Electronic Goldmine (Scottsdale, AZ) has listed the Motorola Timing2000 GPS antenna (they don’t know model) and 
it’s matching Motorola Pole Mount at Electronics Surplus in Mentor, OH

Motorola GCNTM20A3A : Timing2000 Antenna (Outdoor), Goldmine.
https://theelectronicgoldmine.com/products/g28183
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