Figure 11. Facsimile installation, private line antisidetone station connectors.

Facsimile installation, private line antisidetone station connectors.

when using Facsimile Transceiver TT-1/TXC-1,

the magnetic coupling connector on the UC

external telephones must be used at each end of

coupling coil, connect the telephone line directly

the circuit. Facsimile operation is also possible

to the 1V connector on the coupling coil. If the

over blind circuits, on prearranged schedules,

circuit loss is exceptionally high, the connector

without voice communication.

marked 6V on the coupling coil may be used,

provided, the line loss is at least 18 dbm before

17. Radio Circuit Considerations

reaching the first telephone exchange or repeater.

a. Subcarrier Amplitude Modulation (SCAM).

Warning: Do not use the coupling coil outputs

The average amplitude variations of the facsimile

marked 1V or 6V with any commercial or com-

signal change in proportion to the average densi-

mon battery circuits, or any circuit that uses sig-

ties of the picture being scanned. Slight ampli-

naling or ringing.

tude variations in the received signal, other than

16. Talking Circuits

those caused by the components of the facsimile

signal, also will cause objectionable distortion in

Facsimile Transceivers TT-1A/TXC-1 through

the received copy. This is especially noticeable

TT-1F/TXC-1 have built-in talk-back circuit

when receiving photographic material. When

facilities and permit communication between

transmitting black and white copy only, consider-

transmitting and receiving operators over the

able changes in amplitude can be tolerated, al-

same circuit used for facsimile signals. This

though distortion, caused by amplitude varia-

facility is controlled by the STANDBY-MON-

TALK switch (S5) on the front panel. However,

tions in the received signal, will appear in the