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|  MIL-C-70489(AR)
b.
Communicate with DMD (AN/PSG-2B) and FIST (AN/PSG-5).
Enter fire direction center data.
c.
d.
Select mortar, location, weapon type, and ammunition.
e.
Compute firing data.
3.2
Performance.
3.2.1 General. The performance of the MBC shall be in
accordance with the following requirements.
3.2.1.1 External input power. The MBC shall be capable of
accepting power from a 20 to 32 volt vehicular power supply. With
input power applied to J2-A (Positive) and J2-B (Return) , the MBC
power consumption shall be 2.5 watts maximum.
3.2.1.2 Internal input power. The MBC shall be capable of
accepting power and operating from the batteries specified on
11785700, with the batteries suppling the input power (J2-A
positive and J2-B negative).
3.2.1.3 Local push to talk. This signal line, XMTKY (J1-F),
shall have a DC resistance less than 10 ohms with respect to
XMTKYR (J1-H) during message transmissions from the AUDIO TO AM
RADIO or AUDIO TO FM RADIO outputs. This signal line shall be 100
kilohms minimum resistance with respect to XMTKYR at other times.
3.2.1.4 FM Radio output. During transmissions, the output
levels shall be 5 plus or minus 2 millivolts rms between AUDIO TO
FM RADIO (J1-E) and RADIO COMMON (J1-D) when terminated
a 150
ohm resistive load.
3.2.1.5 AM Radio output. During message transmissions, the
output shall be 19.5 plus or minus 4 millivolts rms between AUDIO
TO AM RADIO (J1-J) and RADIO COMMON (J1-D) when terminated in a 50
ohm resistive load.
3.2.1.6 Wireline output. The WIRELINE 1 signal line is the
electrical complement of the WIRELINE 2 signal line. During
message transmission on wireline, the signal voltage between
WIRELINE 1 and WIRELINE 2 shall be 775 millivolts plus or minus
2dB when terminated in a 600 ohm resistive load. The wireline
terminals shall receive audio signals at levels between 7.75 and
775 millivolts rms.
3.2.1.7 Radio input. The MBC shall receive audio signals
between 8 millivolts and 2 volt rms with the signal applied
between either AUDIO FROM AM RADIO (J1-A) and RADIO COMMOM (J1-D)
or AUDIO FROM FM RADIO (J1-C) and RADIO COMMON (J1-D).
3
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