Differences Between Subsystem

TM 11-5895-833-12/NAVELEX 0967-LP-550-1010/TO 31R5-2TSC54-91

1-10. Tabulated Data

0-16568/ C-46().Each Electrical Frequency Synthesizer 0-

a. Frequency Conversion Subsystem.

1658/MSC-46(V) (frequency synthesizer) generates the

Operating conditions:

standard and variable frequency signals which provide precise

Input power requirements 115 vac, 50 to 400 Hz

frequency control over the local oscillators in the associated

+45F to + 1000F (+ 7.2ƒC to

Temperature

up- or down-converter.

+37.8C)

(9) Equalizer, Group Delay CN-1425/MSC-46(V).

Elevation

Up to 10, 000 feet above

The Group Delay Equalizer CN-1426/MSC-46(V) (not shown)

sea level.

provides the 50- to 90-MHz linear and parabolic delays

Relative humidity

Tropical conditions including

required to compensate for nonlinearities in equipment

fungus-laden air.

external to the frequency conversion subsystem. The group

Nonoperating conditions:

delay equalizer is mounted external to the frequency

-65ƒF to +155ƒF (-54ƒC

Temperature

conversion subsystem cabinets for optional use when

to +68.40C)

required.

Relative humidity

5% at + 120F (+ 48.9C) or as

(10) Amplifier, Radio Frequency AM-6631- M.C-

high as 100% from -25F to

46(V.Radio Frequency Amplifier AM-66311 MSC-46(V)

+85F(-31.70C

(distribution amplifier), mounted in the up-converter cabinet,

to +29, 40C) with condensation

receives the 1- and 5-MHz standard frequency outputs of the

at all temperatures lower than

terminal frequency standard and provides four 1-MHz and

+85F (+29, 4C).

twenty-six 5-MHz isolated outputs for distribution to the various

Elevation

Up to 40, 000 feet above sea

frequency conversion subsystem components.

level.

(11) Time base patch panel. The time base patch

Salt atmosphere

As encountered during coastal

panel, mounted in the up-converter cabinet, provides the

service,

`patching facilities required for connecting the 1- and 5-MHz

Transportation

Military transportation methods on

outputs of the terminal frequency standard to the input of the

rail

hydrocushion),

distribution amplifier ((10) above), and the 5-MHz outputs of

highways and

unimproved

the distribution amplifier to the various frequency conversion

roads, and C-130E aircraft.

subsystem components.

b. Down-Conversion Equipment.

(12) If. interface facilities. The if. interface facilities

Input:

located at the top of the frequency conversion subsystem

Frequency band

7.25 to 7.75 GHz.

cabinet, provides the facilities required for connecting the 70-

Bandwidth

500 MHz at 0.5 decibels.

MHz inputs and outputs of the ANPrSC-54 modulation and

regference

demodulation equipment to the converters.

Level

43 to - 103 decibels reference

(13) Access panels. A single access panel is

to 1 mw (dbm).

mounted at the top of each up- and down-converter cabinet.

Vswr

Less than 1.2:1 over band.

Impedance

60 ohms.

1-9. Differences Between Subsystem

Configurations

Output:

The main difference between the three configurations of the

Frequency output

70 MHz

frequency conversion subsystem is in the quantity of up-

(Electronic Frequency

converters, down-converters, frequency synthesizers and

Converter CV-1085/

associated blank panels.

The converter and frequency

MSC:46(V))

synthesizer quantities for each configuration are as follows:

Frequency output

70 and 700 MHz

Electronic Frequency

Unit quantities

Converter CV-3085A/

Configu-

Figure

Up-

Down

Frequency

MSC-46(V))

ration

reference

converter

synthesizers

Bandwidth (Electronic

40 MHz

1-1(sh1)

Frequency Converter

1-1(sh 2)

CV-3086/MSC-46(V))

1-1(sh3)

Bandwidth (Electronic

125MHz

Frequency Converter

CV-3085/MSC-46(V))

Level (Electronic

0 dBm 0.5 db for 70 MHZ

Frequency Converter

input signal of.

put signal of - 43 dbm.

CV-3085MSC-46(V))

Level (Electronic

0 dBm + 2.5 db for 700

Frequency Converter

MHz input signal

CV-30856AMSC-46(V)) of - 43 dbm.

Vswr

Less than 1.15:1 from 50 to 90

MHz.

Compression

Less than 0.5 dB at + 10 dbm output.

Impedance

50 ohms.

If.

700 MHz (special application

with Electronic Frequency

Converter CV-3085/MSC-46V)

Noise figure

16.5 db maximum

1-3