TELCOSAT RPT 900
Document use is restricted to that described on cover
11
If you require any additional installation guidelines then please consult your supplier or consult with
an RF Systems Engineer.
3.2 TOOLS REQUIRED
Spectrum analyzer with a tracking generator, frequency ranges 1 Gigahertz.
Optional Signal Generator for onsite testing of the repeater, frequency range of 1 Gigahertz minimum.
Antenna analyzer.
Computer with all necessary cables.
Multi-meter.
Hand tools.
Water proofing tape.
Coax cable straps for support.
Cellular Phone.
3.3 ANTENNA REQUIREMENTS
ANTENNAS: please read your manufacturers antenna specifications before installation. Your antenna
will require a type “N” connection. The antenna, coax, and fittings must be 50 ohms impedance.
The cellular repeater requires antennas that operate in the desired frequency range of the cellular
repeater. The RBB850 Repeater has a frequency operating range of 824 to 849 Megahertz for the up-
link, and 869 to894 Megahertz for the downlink. Your antennas must operate within these frequencies.
Failure to select the proper antennas will degrade the performance of your repeater.
NOTE:
“UP-LINK” is the radio link from your hand held cellular phone to the cellular tower in the frequency
range of 824/ 849 Megahertz
“DOWN-LINK” is the radio link from the cellular tower to your cellular phone in the frequency range of
869 /894 Megahertz.
3.4 ANTENNA ISOLATION & COAX CABLES
All repeaters require antenna isolation to prevent oscillation. The usable gain level of your repeater is
directly linked to the antenna isolation values. The maximum gain of your repeater must be adjusted to
a minimum of 10 dB lower than your antenna isolation values. For example, if your antenna isolation
value is 75dB then your maximum usable repeater gain is 65dB.
Due to the variations of system layouts and requirements it is not possible to have one procedure that
will suffice every installation. You are strongly advised to acquire the services of an RF system designer
to calculate your antenna isolation requirements.
Ensure that your antennas are at the maximum possible distance apart. Do not place antennas in close
proximity to each other; otherwise you will activate the oscillation detection process.
Coax cables should be low loss 50 ohm, and suitable for 800 Mhz band frequency.
Antenna connections should be clean and moisture free. Do not spray lubricant into the connectors as
this prevents the signal traveling through the coax. Use a cleaning solvent that has no oil and does not
leave any residue. High quality oil-less contact cleaner is suitable.