Spectracom 8225 Installation Manual

Model 8225 GPS Outdoor Antenna Installation Guide
/
Rev D, June 2012 PN 8225-5000-0050
Spectracom provides one of two different standard GPS antennas with certain GPS-equipped products, including the
Model 8225 (1) antenna and the TSAT dome antenna (2) (the product number
of which varies depending on the board-level timing product with which it
ships). Each antenna is shipped with a mast and clamps for affixing the
antenna to an appropriate structure. The antenna components themselves are
simply screwed together (the appropriate components are threaded). Refer to
the installation instructions herein for proper positioning of your GPS antenna.
NOTE: A free-standing base is sold separately. Contact Spectracom to
order a Model base for your antenna mast.
The Model 8225 is an active GPS antenna tuned to receive 1575.42 MHz L1 band satellite transmissions. The received
signals are passed through a narrow bandpass filter and a preamplifier within the antenna. The active antenna circuitry
provides 30dB of gain and requires +5 VDC at 27 milliamps (provided by a Spectracom GPS receiver over the antenna
cable).
The TSAT dome antenna/receiver is is an active GPS antenna/receiver
operating on the 1575.42 MHz L1 band. It provides continuous tracking with
an update rate of 1 Hz and generates a pulse-per-second (PPS) output
synchronized to UTC within 15 nanoseconds. It also outputs a serial protocol
at RS-422 levels. The receiver requires +5 VDC at 50 milliamps (provided by a
Spectracom board-level product over multi-conductor cable).

Specifications

8225 Antenna
Type
Active
Frequency 1575.42+/- 15 MHz (L1)
Temp Range -30 to 85 C
Gain 30dB
Connector N type, female
Diameter
3.50 in. (8.9 cm)
Weight 6.8 oz. (191 g)

Installing the Antenna

The GPS antenna must be installed outdoors with an unobstructed view of the
sky (to 20° elevation from the horizon). An unobstructed line of sight to the sky
allows the antenna to locate and track the maximum number of satellites
throughout the day. Installations with obstructed views may still prove
functional, but the equipment may experience reduced reception quality or be
unable to track simultaneously the maximum number of satellites. Make sure
the antenna is installed somewhere that it will not be buried in loose or drifting
snow, or obstructed by growing foliage. Whenever possible, avoid placing the
GPS antenna in close proximity to broadcast antennas.
To connect the antenna, run the antenna cable through the mast if desired or
feasible (4, 8), into the antenna slot up through the end of the mast if not
feasible (5), or simply to the antenna dome (9). The 8225 antenna connection
is made inside the housing and the collar screwed down to secure it (3-6). The
TSAT dome antenna is screwed in (7-9).
USA www.spectracomcorp.com | techsupport@spectracomcorp.com | 1565 Jefferson Road STE 460 | Rochester, NY 14623 | +1.585.321.5800
FRANCE www.spectracom.fr | techsupport@spectracom.fr | 3 Avenue du Canada | 91974 Les Ulis, Cedex | +33 (0)1 64 53 39 80
UK www.spectracom.co.uk | techsupport@spectracom.co.uk | 6A Beechwood | Chineham Park | Basingstoke, Hampshire, RG24 8WA | +44 (0)1256 303630
TSAT Dome Antenna
Active
1575.42+/- 15 MHz (L1)
-40 to 85 C
N/A
12-pin round
3.74 in. (9.5 cm)
5.4 oz. (154 g)
1 1
3
4
5
2 2