2050
User Guide
GPS Antenna Connector
The connector used on the 2050 is a TNC female, labeled “GPS ANT” on the front panel of
the sensor as shown in Figure 2.
Note –
The center pin of the TNC connector carries a voltage of 4.4 VDC (nominally), which is used to power
the preamplifier in the
GPS
antenna. When the
GPS
unit is powered on, the antenna cable should not be
disconnected.
The cable length between the 2050 and the Tri-Mode antenna should not exceed more than
10dB loss at 1.5GHz. Examples are:
Cable Type Maximum Length
RG58/U 13.7m
(45ft)
LMR400 59.7m
(196ft)
A Standard coaxial cable, C&C P/N 4250001-12, provides a 3.6m (12ft) length of RG58/U
cable with a right angle male TNC connector to a straight male TNC connector. This is
suitable for connecting the 2050
GPS
sensor to the Tri-Mode antenna.
In-line L-Band RF amplifiers, C&C P/N 3250002-T, suitable for all
GPS
frequencies may be
used to increase the length of the antenna cable, but care should be exercised that tracking
performance is not degraded due to multiple connections, noise from the amplifier, and
possible ingress of moisture and dust.
Note –
The antenna cable can degrade signal quality if incorrectly installed, or the cable loss exceeds
specifications. Care should be taken not to kink, stretch or damage the antenna cable. Do not place the cable
adjacent to cables carrying electrical power or radio frequencies.
Where the
GPS
antenna is exposed to sources of electromagnetic discharge such as lightning, an
in-line electrical surge suppressor should be considered between the
GPS
sensor and antenna.
Such installations should comply with local regulatory codes and practices.
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