200 WATT BAND II VHF FM POWER AMPLIFIER
6
Ensure that all antenna connections are sound, this is important as poor connections
and soldered joints can cause RF burns to personnel, severe noise to the
transmission and excessive RF bandwidth.
Ideally the antenna for this power amplifier should be at least 2 dipoles stacked and
phased, a 5/8 type or other antenna with similar gain or more to the horizon. It
should be ideally mounted 20 meters high and clear of any surrounding objects to
get maximum range and more importantly to reduce risk of radio frequency radiation
to personnel. When mounted at 20 meters in height off ground and using 200 watts
of transmitter power, power flux density measurements made at ground level directly
under the antennas described above show less than 1 W/m2. Several European
countries use a value for the power flux density of 10 W/m2 as a basis for
considering whether or not an area is safe. The issue of radio frequency radiation
limits is a contentious one and work in this field is continuing worldwide.
4. INSTALLATION
4.1 Pre-Installation
The previous section, PRE-INSTALLTION is very important, check this has been
done. It is self explanatory from the rear panel where the power supply plugs in, DO
NOT plug in the power supply at this stage.
4.2 Antenna Connection
Plug the antenna cable into the amplifier large SO239 or N type connector. Make
sure this tight as poor and loose connections can cause RF burns to personnel,
severe noise to the transmission and excessive RF bandwidth.
4.3 Driver / Exciter Connection
Plug the 1W drive into the small BNC connector. DO NOT USE MORE THAN 1.4W
or it will damage the input stage.
4.4 Power Supply Connections
Plug in power supply to mains and power up driver transmitter.
