Figure 3-3. Restorer, Pulse Form TD-206/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