[time-nuts] Re: Motorola Timing2000 GPS “L1” Antenna

[Art Sepin]

Hi Greg,

The Motorola designed Timing2000 GPS antenna was manufactured for Motorola by Yokowa of Japan for use in Motorola CDMA and iDEN cell sites. Here is a complete Timing2000 datasheet with mounting backet dimensions.

There is lots of free-air volume in this design so, in spite of an O-Ring seal, it still breathes with excursions of barometric pressure. If the timing2000 is located at or near a shoreline, or in humid weather areas, it will pull in moisture that cannot escape. In servicing these antennas, we found that salt air is much worse that being near fresh water (not a surprise). We also found that a thin application of silicon grease to the O-Ring stops air transfer at some, but not all, installation sites (this "fix" was recommended but not adopted).

I have not tried this experiment with our Timing2000 engineering unit yet, but it may also receive Galileo and BeiDou signals in spite of its dual-filter design.

Art


-----Original Message-----
From: Gregory Beat via time-nuts <time-nuts at lists.febo.com>
Sent: Saturday, August 3, 2024 7:46 AM
To: time-nuts at lists.febo.com
Cc: Gregory Beat <w9gb at icloud.com>
Subject: [time-nuts] Motorola Timing2000 GPS “L1” Antenna

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

• L1 (1575.42 MHz) +/- 2 MHz Operating frequency • 25dB Active antenna • 5 Volt operation (internal pre-amp) • 26mA typical current consumption • High strength direct mount • <1.5dB typical noise figure • 40dB minimum filtering at +/-50MHz

DATA SHEET for Motorola Timing 2000 Antenna (GCNTM20A3A)
http://mpl.jp/pdf_data/timing2000.pdf

Electronic Surplus (Mentor, OH)
Pole mount for Motorola outdoor GPS antennas (circa mid-1990s to early 2000s), with 1-1/8” hole, works as mount for other GPS or vertical antennas.
https://www.electronicsurplus.com/motorola-inc-mnt62312b1-hardware-post-mounting-bracket

Motorola # MNT62312B1 : Antenna Pole/Post Mounting bracket Right-Angle 2-5/8" Wide x 4-3/8" Long 1-1/8" Diameter Hole for antenna mount Base has with four 1/2" x 1/4" slots

U-Bolts for 1 1/2" Diameter Pipe

Two 2" x 3", U-Bolts Threaded 1/4"-20 with Lock Washers and Nuts, _______________________________________________
time-nuts mailing list -- time-nuts at lists.febo.com To unsubscribe send an email to time-nuts-leave at lists.febo.com
-------------- next part --------------
A non-text attachment was scrubbed...
Name: Timing2000TechPresentation.pdf
Type: application/pdf
Size: 309136 bytes
Desc: not available
URL: <http://febo.com/pipermail/time-nuts_lists.febo.com/attachments/20240804/68545eb6/attachment.pdf>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: Timing2000Armaflex.gif
Type: image/gif
Size: 12240 bytes
Desc: not available
URL: <http://febo.com/pipermail/time-nuts_lists.febo.com/attachments/20240804/68545eb6/attachment.gif>