CAUTION:
This amplifier produces RF voltages that can cause painful and dangerous burns. Use
caution! Connect and disconnect all RF connections with the drive power and DC power off.
DRIVE POWER:
RF power transistors, although quite rugged in most respects, are easily damage by
overdrive. Be careful not to overdrive the amplifier even momentarily (before applying any
drive signal please check table I for details). Higher-than-rated drive power may destroy the
transistors and VOID ANY WARRANTY.
SUPPLY VOLTAGE:
The maximum operating voltage is 29.8VDC. When using the DC power supply make sure
that it is not adjusted above 29.8volts. If it is possible for the voltage to go above 29.8Volts
for any reason, including failure of the power supply, install a “crowbar” circuit to prevent
damage to the amplifier in the event of excess voltage.
CASE TEMPERATURE
High power can mean high temperatures. Mount the amplifier where air can freely circulate
over it and where clothing, blankets, etc. will not accidentally be placed over it. Keep duty
cycle below limits.
TERMINATIONS
The efficiency of this amplifier will degrade if it is operates into anything but a 50 Ωload.
Lowered efficiency may mean any or all of the following: lower power output, increased
current drain, higher operating temperature, and reduced life time.
VI. INSTALLATION
The PA3-2AB-AIR amplifier installation is illustrated in figure 2. Mount the amplifier as close to the
antenna as practical. Keep coaxial cable runs short, avoiding sharp bends and pinching. Avoid loose
connectors at the ends of the coaxial cables. The antenna should be matched to an SWR better than
1.5:1 for best results. Higher SWR will degrade the performance of the amplifier.
Mount the amplifier away from the sources of heat, and where air can freely circulate around it. Avoid
mounting the amplifier in the engine compartment or near the exhaust pipe system.
It is also important to securely fasten the unit. An improperly mounted piece of equipment is subjected
to damage as it moves about and can cause serious injuries in an accident. Use bolts through the
holes in the amplifiers flange to fasten the unit to a secure mounting surface (see figure 2).
V. OPERATING PRECAUTIONS
