Automatic Retransmitting Makeshift Repeater


Posted on Sep 6, 2012

This circuit will be of interest to the radio amateur and anyone posessing two radios, (one of which must be able to transmit i.e. a transceiver). It is a self powered (audio derived) repeater circuit for receiving a signal and re-transmitting it via the other radio. This little circuit can turn two hand-held radios into a makeshift repeater. Any radio will work fine as Radio 1, but Radio 2 must be a Yaesu, or some other type that also goes on the air when its microphone input is shunted with 1-2 kiloohms. As soon as a radio signal opens Radio 1`s squelch circuit, a tiny amount of energy stolen from the audio signal turns on the MOSFET and it conducts as long as the audio is present. While it conducts, Radio 2 is on the air, retransmitting the content supplied by Radio 1 through C1 and P1. The BS108 has a conveniently low G-S threshold voltage.


Automatic Retransmitting Makeshift Repeater
Click here to download the full size of the above Circuit.




Leave Comment

characters left:

New Circuits

.

 


Popular Circuits

Subwoofer Filter Circuit Using Op-Amp TL072
Robot Train Cruise Control
Tesla Coils Wiring
cellular phone detector circuit schematic
battery charger circuit
Replacing Motorola Batteries
2N4401 NPN General Purpose Amplifier
X’Mas LED Decoration circuit
Three-phase asynchronous motor PTC protection circuits
Touch-type FET stepless dimmer
Three of the five band equalizer circuit transistor



Top