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PAC 10-70-B Instruction Manual
Amplifier
PAC 10-70-B
AMPLIFIER
INSTALLATION
The output of the transceiver should be connected to the input of the amplifier with a
short piece of coax with a quality of at least RG-8. If the DC power cables are extended,
be sure to use cable of the same size to avoid voltage drops across the power leads. The
unit is tuned for the center of the frequency band at the factory, unless otherwise specified
when purchasing order is received. If input SWR shows higher than 1.5:1, check the
interconnecting cables between the amplifier and the transceiver for proper length.
Attempt to use a physical length that will give you a 1/4 or 1/2 wavelength for best
efficiency.
DESCRIPTION OF UNIT
This unit uses modern solid state devices and stripline techniques to achieve a broadband,
high reliability power amplifier. When the unit is turned off, the drive input will be sent
straight through the amplifier with no measurable effect. When the unit is turned on, the
RF sensing circuit in the amplifier will key the transmit relay when it senses an input
signal and reroute the RF drive to the power transistor circuit for amplifying. An RCA
phono jack is supplied at the rear of the unit to allow the XMT relay to be hard keyed in
the event that the input signal is too weak to activate the RF sensing circuit. This external
keying jack requires a positive voltage anywhere in the range of 1 to 14 volts. Current
drawn through this hard key jack is less than 1/2 amps. Input SWR should be better than
1.5:1 for effective performance.
SPECIFICATIONS
POWER OUTPUT ............................ 70 Watts, nominal with 10 Watts of drive
POWER INPUT ................................ 5 - 15 Watts drive
FREQUENCY RANGE .................... 150 - 174 MHz
IMPEDANCE.................................... 50 Ohms
SUPPLY VOLTAGE ........................ 13.8 VDC
CONNECTORS ................................ SO-239 UHF Type
FUSE ................................................. 15 Amp
OPERATING MODES ..................... FM, CW
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