Realistic PRO-2021 - RF AMP Alignment; VHF LO Band RF AMP Alignment; Aircraft Band RF AMP Alignment

RF AMP ALIGNMENT
VHF LO BAND
Step 1: Connect instruments as shown below.
ANT. JACK
SWEEP
GENERATOR
30MHz — S4MHz
Step 2: Program 30 MHz (CH1), 40 MHz (CH2) and 54 MHz (CH3).
Step 3: Select Channel 2 (40 MHz) and adjust T3 and T6 as shown below RF waveform.
Step 4: Check Channels 1 through 3 for the below RF waveform. A slight deviation as shown below is
acceptable.
RESPONSE (dB)
FREQIMHz)
AIRCRAFT BAND
Step 1: Connect instruments: Same connection as VHF Lo band except Sweep Generator frequency,
change to 108 MHz to 174 MHz.
Step 2: Program 108 MHz (CH1), 127 MHz (CH2), 136 MHz (CH3)
Step 3: Select Channel 2 (127 MHz) and adjust T1 and T4 for maximum RF waveform.
Step4: Check Channels 1 through 3 for maximum RF waveform. Slight deviation as shown below is
acceptable.
NOTE: Perform AIRCRAFT BAND RF AMP ALIGNMENT before VHF-HI BAND.
If this procedure is not followed, alignment may be impossible and/or inaccurate.
RESPONSE (dB)
108 127 136
FREQ(MHz)
— 10—