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Figure 3-2. Multiplexer TD-754/G.
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TM-11-5895-458-14 Low Capacity Tactical Radio Relay Frequency System Manual
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Figure 3-4. Multiplexer TD-660/G.


TM 11-5895-458-14
Input signal ............... 30 mV pp max, 10 mV
3-3 .Restorer, Pulse Form TD-206/G
min
a. Use. Restorer, Pulse Form TD-206/G (fig. 3-3) is
Output signal ............ Leading edges of puls
a two-way unattended' repeater for pcm cable systems.
swing 2 volts from zero
It is installed at 1-mile intervals in the transmission cable
peak.
to restore pcm pulse form and timing.
Pulse type...................... Binary dipulse
b. Technical Characteristics.
Pulse rate ...................... 2,304 kHz
Input or output signal:
Pulse width .................... 205 nsec
Impedance .................... 62 ohms
Power requirements ...... 38-mA constant curre]
Amplitude:
supply (from TD-204/U
TD-754/G at either end)
Operating temperature .. +126 F to -60 F
Figure 3-3. Restorer, Pulse Form TD-206/G.
Addressing ..............................2- or 4-kHz binary pattern
3-4. Multiplexers TD-660/G or TD-660A/G
with a locking time of less
a. Use. Multiplexers TD-660/G or TD-660A (fig. 3-4)
than 1/4 second (uses the
convert 6 or 12 four-wire voice-frequency (vf) channels to
last digit position of the
a tdm-pcm signal in their transmit sections and vice
last channel in each
versa in their receive sections. The TD-660/G is used in
frame).
nonsecure communication systems, and the TD-660A/G
(2) Audio channel characteristics.
is used in either nonsecure or secure communication
Modulating bandwidth .............300 to 3,500 Hz
systems.
Input for full modulation...........-4 dBm
b. Technical Characteristics.
Output for full modu-
(1)  General.
lation (nominal)...................-4 dBm (4-wire);+1 dBm
Number of audio channels .........6 or 12; 4-wire
(2-wire) (output is ad-
Compatible radio set ..................AN/GRC-103
justable from --6 to + 5
Compatible cable set ..................TD-204/U or TD-74/G
dBm).
Type of multiplexing....................Time division
Input and output impedence....600 ohms balanced
Type of modulation .....................Pulse code
Signal-to-noise ratio
Channel sampling rate ...............8 kHz
(F1A) ..................................More than 55 dB
Number of pcm digits
Signal-to-noise plus
per channel sample ................ 6
crosstalk ratio .....................More than 53 dB
Signal-to-total distortion
ratio ...................................More than 30 dB
3-4


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