MIL-PRF-49118B(CR)
3.5.13 Power Output (Transmitter).
3.5.13.1 High power mode. The RF power delivered to a 50 ohm load connected to the
appropriate output terminals shall be as follows:
FM
30 watts average (30.0000 to 75.9999 MHz)
CW
30 watts average
FSK
30 watts average
SSB
30 watts PEP
AM
30 watts PEP
The above values shall be maintained within +2dB and -1.5dB over the complete tuning
range of the transmitter; except at 75.9999 where the value shall be maintained within ±2dB.
Over the ambient temperature range -50 degrees F to + 160 degrees F (including the effect of
unload) and over an input voltage range of 20 to 32 volts DC, the transmitter power variation
shall not exceed +2.0 dB, -3.0 dB. For continuous key-down operation in excess of 3 minutes
but less than 10 minutes under the same conditions, the output power shall be within 2 dB of the
nominal value. For continuous key down operation in excess of 10 minutes, under the same
conditions, the output power may be considerably less than the nominal value, however, no
permanent degradation in performance shall result (see 4.6.3).
3.5.13.2 Low power mode. On low power, the output of the transmitter shall be
3 Watts + 2dB, -2.5dB below the high power output in all modes.
3.5.14 FM deviation. When operating in the FM mode, the deviation level of the carrier
shall be between ±11 KHz and ±12 KHz with levels corresponding to normal speech into the
handset H-250 ( )/GR. The 150 Hz, ±2 Hz tone oscillator shall frequency modulate the
transmitter in the FM mode to a deviation of 3KHz, ± 0.5 KHz (see 4.5.14).
3.5.15 Burst transmission modes. The delay between initial keying at the transmitter input
and producing 90 percent full power output shall be less than 30 milliseconds. The transmitter
shall remain in the transmit mode during pauses in code transmission for a period of 1.2 seconds,
± 0.2 seconds. During transmission at rates up to 300 words per minute, the rise time of the
keyed envelope (10% to 80%) shall be 200 microseconds or less. The fall time (100 to 20%)
shall be 175 microseconds or less (see 4.5.15).
3.5.15.1 Frequency shift keying. The mark signal shall be 1575 Hz, ± 25 Hz and the space
signal shall be 2425 Hz, ± 25 Hz.
3.5.15.2 CW keying. The CW signal shall be 2000 Hz, ± 25 Hz.
3.5.16 Transmitter spurious. The level of antenna radiated or antenna terminal conducted
emissions, other than the desired output frequencies at high or low power when loaded into one
of the antennas or into a 50 ohm resistive load, shall conform to the following (see 4.5.16):
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