220
SyncServer 600 Series User’s Guide
098-00720-000 Revision B – April, 2016
Appendix C Installing GNSS Antennas
Antenna Kits Overview
Antenna Kits Overview
When deciding on which of the available antenna kits meets your needs, the key
factor is the distance between the GNSS antenna and the SyncServer S6x0. There
are several coaxial cable lengths available to assist in receiving proper gains from
the GNSS antenna. Microsemi offers eight antenna kits for the SyncServer S6x0,
plus separate GNSS antenna accessory parts including the antenna, cable,
amplifier, lightning arrestor, and splitter.
Considerations for Antenna Installation
The GNSS engine requires a net gain at the antenna connector input of the chassis
to be between 15 to 30 dB.
All antenna kits include the GNSS L1 antenna, mounting bracket and a BNC cable
adapter. The antennas, in-line amplifiers and the lightning arrestor have N
connectors.
All antenna kits supplied use a LMR-240 or LMR-400, or equivalent, low-loss
coaxial cable. The L1 signal loss of LMR-400 is 0.167 dB/meter. The L1 signal loss
of LMR-240 is 0.43 dB/meter. The L1 signal loss of a 90 V lightning arrestor is
typically less than 0.25 dB. See
GNSS Antennas with Low Noise Amplifiers
The antenna used with the SyncServer S600/S650 is a high-gain (40dB) GNSS
antenna covering the GPS L1, GLONASS L1, and SBAS (WAAS, EGNOS and
MSAS) frequency band (1575 to 1606 MHz). The antenna has a three stage
low-noise amplifier, with a mid-section SAW with a tight pre-filter to protect against
saturation by high level sub-harmonics and L-Band signals making it excellent for
timing applications. An L-bracket for pole mounting and 3-foot BNC(m) to N(f) cable
is also included.
Figure C-1. GNSS Antenna
