TM 11-7440-232-12/NAVELEX 0967-LP-275-5010
1-10. DIFFERENCES BETWEEN MODELS
a. The differences between models are tabulated below.
b. The major difference is the modem shelf used for each digital data modem.
MD-701/UY uses unshielded modem shelf with rear termination panel and RF oscillator.
MD-701A/UY uses modified unshielded modem shelf with rear termination panel and RF oscillator and is
modified for use of a data carrier alarm module.
MD-701B/UY uses RF shielded modem shelf (which includes a rear termination panel) with RF oscillator and
includes a data carrier alarm module.
c. The minor differences are the unmodified modules used in the MD-701/UY and the modified modules used in the
MD-701A/UY and MD-701B/UY. Refer to the specific modules listed below in table 1-1.
d. Also, refer to paragraph 1-12, Equipment Configuration, for an illustration of each digital data modem, including
the differences.
TABLE 1-1. DIFFERENCES
DIGITAL DATA MODEM MD-701(*)/UY
COMPONENT/ASSEMBLY
701/UY
701A/UY
701B/UY
DIGITAL DATA MODEM
MD-701/UY (26C1-30006-2A)
*
MD-701A/UY (26C1-30006-03AC)
*
MD-701B/UY (26C1-30006-04AC)
*
POWER SUPPLY ASSEMBLY, A1
900-44751-01
*
900-44571-01 modified by MK2-44571-01
*
*
DIGITAL DATA TRANSMITTER, A2
900-44572-01
*
900-44572-01 modified by MK1-44572-01
*
*
1-14
