Radio connection of two fax machines. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Telephony
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In 1995, I experimented with connecting two office fax machines over the air. For this, two VHF radio stations were used on the 145 MHz band. Faxes connected at 2400 bps.
The interface diagram is shown in the figure.
Since the fax works in half-duplex mode, the task of the interface is to switch the radio from receiving to transmitting, i.e. Connecting a speaker or microphone to a device.
A transformer from a modem was used as a transformer (you can try to use a transformer from a telephone set). All transistors type KT315, diodes - KD522. LED (LED) - AL307.
Author: PA3DJM
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