Page 11 of 23
DWG ID: 181-0101-01
Date: 2003-08-12
Press the “5” key for the RECEIVER GAIN ADJUST.
Adjust this to get a 1 V pp signal at MX919B IC terminal 23 (A2U3-23).
Go back and check the RECEIVER DC OFFSET ADJUST, because the RECEIVER
GAIN ADJUST interacts with it due to a dc offset in the radio transceiver.
5.2.6
TRANSMITTER RF POWER OUTPUT ADJUST
Set service monitor to measure transmitter power.
Press the “6” key for TRANSMITTER POWER ADJUST. Then press the “+” or “-” key
once to activate.
Adjust the RF power output level by pressing the “+” or “-” key, up to 6 W, in
accordance with your license.
Note: The transmitter is not rated for 100 % duty cycle (continuous operation) at the
higher power levels. Work quickly to set the power.
For operational use with an RF power amplifier, adjust the output power of the TALON
UDC unit for the minimum power required to drive the power amplifier to the licensed
power output. Final power output is set with the Talon UDC connected to the RF power
amplifier following the manufacturer’s instructions.
5.2.7
TRANSMITTER BALANCE
For proper modulation and bandwidth occupancy, check and set this adjustment at the
transmit frequency.
•
Turn UUT off
•
Remove A2P2 from A2J7
•
Connect a square wave generator at a frequency of 500 Hz, 50 % duty factor,
approximately 0.2 V pp, and 2.5 V dc offset to A2J7-2 (adjacent to A2P1-7) and
GND (A2D1-A)
•
Turn UUT on
Press the “7” key for TRANSMITTER BALANCE.
Monitor the demodulated signal:
•
Press a key to transmit
•
Adjust the amplitude of the 500-Hz square wave to obtain 2.3 kHz deviation on the
service monitor. (The deviation will change with balance). Amplitude will be about
0.4 V pp.