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RF Technology PA70 Page 6
3 ALIGNMENT PROCEDURE
This causes the TEMP LED to come on and also reduces the dc reference
voltage to the output power error amplifier U2d. The input power will then be
reduced by the transmitter ALC circuits and the output transistors are kept
within safe operating limits.
3
Alignment Procedure
The following procedure may be used to align the amplifier for optimum
performance.
3.1
Standard Test Conditions
RF Input Source
T70 series transmitter set for 10 Watts maximum output.
The ALC output from the PA70 must be connected to the T70 ALC input.
Power Supply
13.8 Vdc at 15A with a load current meter or a test meter connected to measure
the voltage between pins 2 and 5 of the PA70 test connector (0.1 Vdc = 1A)
RF Power Meter and Load
50O 0-70 Watts
VSWR <1.2:1
Directional RF Power Meter
50O 0-10 Watts
Forward and Reverse
OR
A dc test meter connected to measure the forward and reverse voltage at the
T70 test connector.
