MIL-PRF-49118B(CR)
165W
165W
160W
FSK & CW
(Continuous Key
Down)
FM & AM (Single
165W
165W
160w
Tone Modulation)
SSB (Two Tone
127W
120W
115W
Modulation)
In the low power transmit mode the input power shall not exceed 50 watts in any mode (see
4.5.26).
3.5.27 Input voltage. For input voltages in the range of 20 to 32 VDC, the Radio Set shall
meet the following requirements (see 4.5.27):
Performance
Paragraph
Measurement
3.5.1
Sensitivity
Full specification performance
3.5.10
Intermodulation
Full specification performance
3.5.13
Transmitter power output
As specified in 3.5.13
3.5.16.3
Transmitter intermodulation
As specified in 3.5.16.
3.5.24.2
Stability vs service conditions
Full specification performance
3.5.28 Retransmission operation. Two (2) separate Radio Sets shall operate satisfactorily
when they are interconnected using a retransmission cable kit, MK-456/GRC and tested as
above. The overall distortion, as measured at the end of the link radio, shall be 8% maximum.
The receiver, in the retransmission configuration only, shall remain unsquelched for 3.5 seconds
maximum following receipt of a signal when in the SSB mode.
3.5.29 Antenna matching network. The antenna matching network shall match the
transmitter output stage and receiver input stage to the following antennas, in the indicated
frequency ranges, such that the VSWR between these stages and the matching network is 1.5 to 1
or less.
Antenna
Frequency range
AS-2974/PRC-70
6 ft whip
4-76 MHz
9 ft whip
3-76 MHz
AS-2975/PRC-70
2-30 MHz
The maximum time required to tune shall be 10 seconds, except for the AS-2974 in the
3 Mhz and 4 MHz range the maximum tune time shall be 18 seconds. During tuning, an audio
tone shall be present in the handset or headset which automatically turns off at the end of the
tuning cycle. A low duty cycle tone shall be superimposed on the sidetone audio to alert the
operator that the RT unit should be retuned. This tone shall be enabled before the VSWR
10
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