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098-00564-000 Revision A3 – July, 2013
TimeProvider 2300/2700 User’s Guide
333
Appendix C Installing GNSS Antennas
Available GNSS Antenna Kits
Symmetricom does not recommend the use of GNSS splitters. However, if one is
used, it must provide a load of at least 10mA.
Available GNSS Antenna Kits
Each of the GNSS antenna kits are available with cable lengths of 20, 40, 70, 150
and 230 meters each providing RF gain to the GNSS receiver of between 15 and 30
dB using combinations of a GNSS 26 dB gain active antenna, a GNSS 40 dB gain
active antenna and a 25 dB gain GNSS in-line amplifier. Components are
weather-proof packaged per IP67 for exposed locations. The GNSS Input Card
provides power to the active antenna and in-line amplifier and then detects alarms
on antenna connection open conditions.
Symmetricom does not recommend the use of GNSS splitters. Splitters reduce the
reliability of the overall system, add additional delay, and may not provide a DC load
to the unit. The TimeProvider 2700 requires at least 10mA of DC current load on the
antenna port to prevent an open-circuit alarm. This alarm will prevent using GNSS
as a reference.
All GNSS antenna kits include the antenna, mounting bracket, coaxial cable,
required adapters, a lightning arrestor, and other kit components. The GNSS
antenna kits are listed in
Table C-1. GNSS Antenna Kits for TimeProvider 2700
Antenna Kit
Part Number
Cable Length
(meters)
Cable
Delay
(ns)
min
max
TP 2700 GNSS (GPS/GLONASS) Antenna Kit,
20 meter
990-13180-020 10
20
76
TP 2700 GNSS (GPS/GLONASS) Antenna Kit,
40 meter
990-13180-040 30
40
154
TP 2700 GNSS (GPS/GLONASS) Antenna Kit,
70 meter
990-13180-070
58
70
271
TP 2700 GNSS (GPS/GLONASS) Antenna Kit,
150 meter
990-13180-150
124
150
575
TP 2700 GNSS (GPS/GLONASS) Antenna Kit,
230 meter
990-13180-230
202
230
902
Note
: The cable delay values correspond to the cable kit being used
in its entirety without modification. The values assume that a splitter is
not used. Splitters are not recommended.