26
GNSS Antenna and Cable Information
Part No.
Description
Delay, ns
Loss
CA0021315
15-m (50-ft) cable, RG-6
60 ns
-5 dB
CA0021330
30-m (100-ft) cable, RG-6
119 ns
-9 dB
CA0021345
45-m (150-ft) cable, RG-6
177 ns
-13 dB
CA0021360
60-m (200-ft) cable, RG-6
236 ns
-17 dB
CA0021375
75-m (250-ft) cable, RG-6
295 ns
-21 dB
WC0004900
305-m (1000-ft) roll RG-11
3.92 ns/m
-17.5 dB/100 m
AS0044600
Kit, crimp tool and 25 connectors, RG-11
N/A
N/A
AS0044700
21-dB in-line amplifier
1 ns
+21 dB
Table 4.2: GNSS Cable Data and Accessory Information
Physical Protection
When routing the antenna cable, protect it from physical damage, which may result from closing
doors, falling objects, foot traffic, etc. Also, when routing around corners, allow for sufficient bend
radius to prevent kinks. Extra length should be allowed at both ends of the cable to prevent tension
on the connectors, which could cause damage or failure. Extra length is useful as a service loop, in
the event that a connector needs replacement.
Do not stretch the cable mid-air over any appreciable distance without support.
Cable
degradation or failure could result. Always leave a drip loop wherever the cable enters a structure,
to prevent water from entering the structure via the cable jacket. The maximum temperature
rating for the type of cable provided with the 1133A is 75
o
C (167
o
F). Exercise care when routing
the cable near sources of heat to avoid cable damage.
Adjacent Signals
Although the standard RG-6 style cable is triple-shielded and has excellent shielding properties, be
cautious when routing near high power RF sources or alongside cables carrying high power RF, such
as transmitter cables. In these applications, consider using RG-11 style cable (P/N WC0004900).
Its quad-shielded design provides even more isolation.
Antenna Power
The RF preamplifier within the antenna requires 5 Vdc at 30 mA maximum for operation. A power
supply within the Model 1133A generates this voltage, which is applied to the antenna via the two
conductors of the coaxial antenna cable. Avoid shorting the center conductor to the shield of the
coaxial cable as it may damage the preamplifier. Conversely, a high-resistance connection or open
circuit would deprive the preamplifier of power. Either a short- or open-circuit condition in the
antenna cable will render the 1133A inoperable.
Prior to initial operation or if problems are suspected, perform the Antenna/Cable Operational
Test described above in Section 4.2.
