Operating instructions

ACCEPTANCE TESTING
5-22
Modulation analyzer - AM
Specification
Frequency range:
400 kHz to 1.05 GHz
Modulation frequency range:
10 Hz to 15 kHz
AM depth range:
0 to 99% (manually tuned)
Resolution:
1% AM
Accuracy (see Note 1)
±5% ±1 digit at 1 kHz
±8.5% ±1 digit, 50 Hz to 10 kHz
Residual AM:
Less than 1% (0.3 to 3.4 kHz)
Note:
(1) At low modulation levels, the residual AM/FM may become significant.
Test equipment
Description Minimum specification Example
RF signal generator 500 kHz to 1 GHz. AM depth 0 to 95%. Modulation
rate 30 Hz to 15 kHz.
IFR 2041
Modulation meter RF I/P 500 kHz to 1 GHz. AM measurement accuracy
±1% of reading ±1 least significant digit at 1 kHz mod
rate for depths up to 95%.
IFR 2305
Power splitter
6 dB 50 Ω 500 kHz to 1 GHz.
WEINSCHEL
1870A
Splitter
Signal generator
C2592
RF INPUT
ANTENNA
INPUT
RF OUTPUT
Modulation meter
UUT
Fig. 5-14 Modulation analyzer - AM
(1) Refer to Results table 5-25 on page 5-39. C
onnect the equipment as shown in Fig. 5-14,
connect
ing the incoming signal to the antenna input socket of the UUT.