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Motorola Timing2000 GPS “L1” Antenna

Gregory Beat

Sat, Aug 3, 2024 2:45 PM

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,

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,

Art Sepin

Sun, Aug 4, 2024 10:13 PM

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

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@lists.febo.com To unsubscribe send an email to time-nuts-leave@lists.febo.com

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@lists.febo.com> Sent: Saturday, August 3, 2024 7:46 AM To: time-nuts@lists.febo.com Cc: Gregory Beat <w9gb@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@lists.febo.com To unsubscribe send an email to time-nuts-leave@lists.febo.com