Connection of computers through COM ports on two wires. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Computers
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From Borisenko A.A.: It really works for me on 80 m and 1,2 km. The transistors shown in the diagram get very hot; therefore, it is better to replace Q1 KT315 with KT626, and Q2 KT361 with KT646. Resistor R3, so that nothing suddenly burns out, set 0,5 watts. You should not replace the microcircuit with any other: UD1 and UD2V do not fit at all, and UD2A has worse characteristics, I did not try to install it, but I assume that it can burn out.
From Maxim Koryazhkin: I tried it - it works, theoretically the circuit can provide work for several kilometers (I worked for 2,5 km for a month). The operator subtracts its own signal from the general one and receives the remote one. The circuit can be optimized by selecting resistors based on the length (line resistance). Having studied Ohm's law at school, he himself will understand, the lamer will still burn the ports on the computer, so I will not explain. And keep in mind - there is no galvanic isolation here!
Publication: cxem.net
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