ACCEPTANCE TESTING
5-1-A-7
FM SCALE SHAPE
SPECIFICATION
Range:
1 MHz max for frequencies up to 21.09375 MHz.
Up to 1% of carrier frequency for carrier frequencies above 21.09375 MHz
Resolution: 3
digits
Accuracy:
±
5% of indication
±
10 Hz at 1 kHz rate internal modulation source
TEST EQUIPMENT
Description Minimum
specification
Example
Modulation meter
Minimum frequency 20 MHz
Aeroflex COM120B
TEST PROCEDURES
(
1)
With the test equipment connected as in Fig. 5-1-A-5, set the UUT to
[Carrier
freq.]
31.64 MHz,
[RF level]
0 dBm then enter the following:
[UTIL]
[Mod'n Mode] [Comp]
[SIG GEN]
[FM2] [Select Source] [Select Internal]
[Internal F4]
[SIG GEN]
[FM1]
(2)
The deviation for FM1 can now be entered. Referring to Table 5-1-A-6, measure
the FM on the modulation meter at the deviations indicated. Check that the
measured deviation is within specification.
(3)
Set FM1 to 0 Hz deviation and select
[FM2]
.
(4)
The deviation for FM2 can now be entered. Repeat (2) above.
TABLE 5-1-A-6 DEVIATION FREQUENCIES
Deviation (kHz)
224 256 289
228 261 293
233 265 298
238 270 302
242 275 307
247 279 312
252 284 316
