MANUAL P/N 900000108 REV D
14
RF Loss
The most important cause of signal loss is the RF signal attenuation experienced in the cable. The
amount of attenuation is related to the type (quality) of coaxial cable and cable length. The antenna
provides about 30 dB of gain to the received GPS signal. The purpose of this gain is to offset the loss
that is experienced in the cable between the GPS antenna and ENTA. It is recommended that the
overall antenna system gain (antenna gain - cable loss) be between 10 to 33 dB. Thus, using an
antenna with 30 dB of gain allows about 20 dB of cable loss.
The ENTA is shipped with 100’ of high quality antenna cable, which has a loss of approximately 13 dB.
Refer to
Table 2
for additional cable configurations. For distances beyond 330’ an in-line amplifier is
required.
PART NUMBER
CABLE LENGTH
CABLE TYPE
002-0037
100 ft
RG 58 (supplied)
002-0039
330 ft
RG 8
002-0040
150 ft
RG 8
051000001
In-line amplifier 20 dB
TNC/TNC connectors
Table 2 Antenna Cables
3.3.3
Network Connection
Connect one end of the network cable to the RJ-45 10/100 BaseT Network port (J2/J17) and connect
the other end of the network cable to your network. The ENTA configuration process is described in
Section 4 and Section 5 .
3.3.4
Other Connections
Connect the output signals as required. For additional help connecting the output signals please refer
to Section 1.10.
