The cable supplied with the ROGER GPS Repeater kit is the standard RG58 type. The cable can be used to make a connection over a maximum distance of 20 metres. Longer connections using this type of cable cause considerable signal attenuation.
For trouble-free operation, the ROGER GPS repeater needs a signal strength of ~ 15 dB. The antenna provided with the kit has an output of 35 dB. A 20-metre connection with an RG-58/RG-223 cable attenuates the signal by an average of -15db because a typical loss through a RG-58 cable is approx. ~ 0.65 dB/m at 1,575 MHz.
If the length of the cable from the external antenna to the repeater is over 20 metres, there are two options:
a) A better cable
RG214/RG213 cable permits cable lengths of up to 45 to 50 metres because the average loss through this type of cable is only ~ 0.3 dB/m at 1,575 MHz.
b) Use a line amplifier
A line amplifier installed between the antenna and repeater/signal splitter amplifies the signal by +18dB, allowing cable lengths of up to 50 metres with the RG-58/RG-223 cable or up to 100 metres with the RG214/RG213 cable to be used.
The ROGER GPS Line Amplifier should be placed as close as possible to the external antenna and in a dry area. No separate power supply unit is required for the amplifier because the ROGER GPS repeater supplies the amplifier via the antenna cable.
Amplifiers can also be connected in series. By using two amplifiers, the maximum length can be increased to 160 metres with the RG-214/RG-213 cables and approximately to 80 metres with the RG-58/RG-223 cable.
RG58/20m |
TNC male/SMA male TNC male/SMA male TNC male/SMA male TNC male/SMA male TNC male/SMA male TNC male/SMA male TNC male/SMA male TNC male/SMA male |
No amplifier required For connecting amplifier/splitter Amplifier required! Between antenna/amplifier units For connecting splitter/amplifier No amplifier required Amplifier required! Amplifier required! |
