MIL-PRF-49185B(CR)
c. Running the transmitter for 30 minutes without drive.
3.5.1.4 Frequency setability. It shall be possible to set the transmitter to any desired
frequency at 0.5 MHz intervals in the frequency range of 695 to 1000 MHz, with an accuracy of
better than 0.002% corresponding to 20 Hz per MHz.
3.5.1.5 Transmitter frequency response. The overall frequency response of the transmitter
when a modulation signal to produce 100 kHz peak deviation is applied to the video input shall
conform to Table I.
TABLE I. Frequency response (transmitter).
Relative attenuation (dB) ref 10 kHz
Frequency
Optimum
Minimum
Maximum
000.125
01.0
0.5
01.5
000.200
00.5
0
01.0
000.250
00.2
0
00.4
001.000
0
-0.2
00.2
010.00
0 (Ref)
---
---
030.00
0
-0.2
00.2
060.00
0.1
0
00.3
120.00
0.15
0
00.5
240.00
0.7
0.5
01.3
360.00
1.5
0.6
02.3
480.00
2.7
1.9
04.2
600.00
4.2
3.4
06.2
720.00
6.0
5.3
08.8
840.00
8.2
7.5
11.5
960.00
10.7
8.5
15.0
3.5.1.6 Spurious outputs. When measured with duplexer, the power output of any
harmonic shall be at least 80 dB below that of the fundamental and the power output of any non-
harmonic extraneous emission of a band outside 15 MHz of the carrier shall be at least 80 dB
below that of the fundamental. All spurious outputs over the frequency range of ± 15 MHz shall
be suppressed at least 60 dB, except for the range occupied by the modulation, where the
spurious outputs shall not exceed the level of the modulation envelope.
3.5.1.7 FDM modulation requirements. With a 1 kHz sinusoidal signal of 191 mV applied
to the transmitter video input, and the input control adjusted to give a reading of 50% on the
panel meter, the transmitter peak deviation shall be between 65 kHz and 97 kHz. This
requirement shall be met with the meter switch in the FDM position.
3.5.2 Receiver section.
8
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