Go to Contents Precise Time and Frequency, Inc., 50L Audubon Road, Wakefield, MA 01880, USA ptf 3207A rev G
Tel: +1-781-245-9090 e-mail: info@ptfinc.com www.ptfinc.com pg. 17
Refer to Figure 4: GPS Signal Strength Requirements.The required external gain at the GPS receiver’s
ANTENNA connector is between 15 and 25 dB.
For example, the GPS antenna provides approximately 35 dB of gain. If one subtracts the
16 dB loss of a 150 foot RG-59 coax antenna cable, the external gain reaching the ANTENNA connector
is between 19 dB, which meets the requirement. Abide by the minimum input gain requirements when
using other cable types and GPS antennas.
Other factors, such as radiation, coverage, VSWR, and input impedance also affect system
performance. It is recommended to use the standard antenna and cable provided.
GNS-related Accessories
The following options can be obtained to:
• Protect against lightning and field-induced electrical surges.
• Connect multiple GPS receivers to a single antenna.
• Extend the range of the GPS antenna cable.
LKIT - Lightning Arrestor
Lightning may damage GPS system components and receiving equipment, even without a direct hit,
resulting in costly repairs and critical interruption of service. The lightning arrestor is designed to work
in conjunction with a low-resistance, low-inductance ground to protect your GPS receiver and
elements of the antenna system from lightning discharges and field-induced electrical surges. In-line
lightning arrestors are mounted between the antenna and the point where the cable enters the
building and require no additional power or wiring except the ground lead.
ptf 1231A - Antenna Distribution Amplifier
An antenna distribution amplifier may be used to drive multiple GPS receivers using a single antenna.
The ptf 1231A has built-in amplification to overcome losses.
HGAN - High Gain Antenna
High gain antennas overcome signal attenuation in by amplifying the GPS signal. The high gain antenn
has a gain of 50 db and can be mounted in place of the standard antenna.
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