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I N S T A L L I N G T H E G P S A N T E N N A
GPS Antenna Kit
The RTM3205 typically ships with a GPS Antenna Kit which includes 50 feet (15 meters) of antenna
cable. This amount of cable is sufficient for the majority of GPS antenna installations. Longer cable
runs can also be accommodated. Figure 1 shows the GPS antenna rooftop mounting hardware. Be-
low is a list of the items in a typical GPS Antenna Kit, part number 0610-0009-001:
• GPS Antenna (part #0502-0013-000)
• Antenna Mounting Adaptor (part #0602-0035-000)
• PVC Mounting Pipe (part #0602-0060-018)
• Hose Clamps (part #0100-0008-000)
• 50 feet of RG-59U (Belden 9104) Cable/TNC Male (part #0600-0013-050)
• A GPS Rooftop Installation Guide (part #5050-0017-000).
** NOTE: If you will not be using the EndRun-supplied cable, then please read the section below
called
Recommended Cable
.
About Coax Cable
The GPS signal frequency is considered to be in the microwave range and is highly affected by
impedance mismatches and discontinuities in the transmission cables. All RF coax cables have a
minimum bend radius. In order to prevent damage, cable should not be bent into tight curves. It is
critically important during installation that kinks are not allowed to form in the cable. If RF coax
cable is bent beyond its minimum bend radius. then damage to the inner construction of the cable
may result. This can lead to much higher levels of loss and a non-functioning GPS receiver.
Similarly, care should be taken to ensure that the cable is not crushed, or likely to be crushed later. If
the RF coax cable does suffer this kind of damage, then the dimensions of the cable will be changed
and it will not maintain its characteristic impedance. Again, this can result in a non-functioning GPS
receiver.
IMPORTANT
Care must be taken when installing the GPS cable. Do not treat it like a power extension cord or garden
hose. Please:
Do not allow kinks to form in the cable at any time.
Ensure that the cable is not crushed at any time.
Do not bend the cable into tight curves.
Ignoring these precautions may damage the cable and cause a myriad of GPS reception problems.
Summary of Contents for RTM3205
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