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13. Demodulator Adjustment
13. Demodulator Adjustment
Assembly
Adjusted
A4 log amplifier/Cal oscillator assembly
Related
Performance
Test
There is no related performance test for this adjustment.
Description
A 5 kHz peak-deviation FM signal is applied to the INPUT
500.
The detected audio is
monitored by an oscilloscope. FM DEMOD is adjusted to peak the response displayed on the
oscilloscope.
DIGITIZING
OSCILLOSCOPE
SIGNAL GENERATOR
I
OUTPUT
ADAPTER
$
ADAPTER
B
A3
sj150e
Figure 2-2 1. Demodulator Adjustment Setup
Equipment
AM/FM signal generator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . HP 8640B
Oscilloscope . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . HP 54501A
Adapters
Type N (m) to BNC (f) (2 required) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1250-1476
Type N (f) to APC 3.5 (f) (Option 026 only) . . . . . . . . . . . . . . . . . . . . . . . .
.1250-1745
Adjustment Procedures 2-53