•
Reference Oscillator
4 Initiate transmit on any channel. Measure transmitted RF carrier frequency
without modulation and, if necessary, adjust REFERENCE OSCILLATOR X701
for carrier frequency to within
±
30Hz of channel frequency.
PA MODULE ALIGNMENT
The 70 -0671 should be adjusted to have a 6 MHz channel spread (8 MHz C-Band)
at 110W. To do so :
1 Change the TX test frequency to the desired frequency.
2 Activate transmit mode and measure RF power at Antenna connector J502.
Set RF output power to 110W at J502 using the programmer.
MODULATOR ALIGNMENT
•
Modulation Limiting
1
Disconnect the hand microphone from its front panel Mic Jack J302.
Apply 3Vrms of 1000Hz signal to pin 1 of Mic Jack J302, then initiate transmit.
2
Measure total carrier deviation and, if needed adjust modulation limiting to obtain
±
5KHz (wide) or
±
2.5KHz (narrow) using the programmer.
•
Microphone Gain
3 No alignment for Microphone gain is required.
•
CTCSS/DCS
4 Remove the 1KHz audio signal from Mic Jack J302.
5 Add 250.3Hz CTCSS tone to the transmit test by testing frequency using the
programmer.
6 Adjust CTCSS deviation to
±
750 Hz
±
10 Hz (wide) or
±
375 Hz
±
10 Hz
(narrow) deviation using the programmer.
7 Change 67.0 Hz CTCSS tone to the transmit test b y testing frequency using in the
programmer.
