How to Make Simplest COR

How to Make Simplest COR.

Simplest COR - SIMPLE In this post I accidentally Generate a COR that is very simple and easy to make. This design can hopefully meet the expectations of some friends who ask, and ask a simple repeater COR schematic. COR consists of only one type IC CD40106 (Hex Schmitt Trigger) then 1 IC Optocoupler 4N33 or similar type as the PTT switch, or can also be replaced with NPN transistors such as the 2N3904 or the like, and a few other components including 2 pcs 1N4148 diodes, resistors , Electrolytic Capacitor and Resistor as a regulator Variable delay PTT (Hang Time) this circuit can work at 5V Voltage s / d 15V. see the following schematic drawings If Delay PTT (Hang Time) perceived lack of enough ... too fast then try to replace the capacitor with a higher value such as 4.7 uF or 10uF

usage the right antenna to retransmit radio

usage the right antenna to retransmit radio 

The selection depends on the purpose of a repeater antenna itself. In general, two omni antennas are used respectively as the receiver (Rx) and transmitter (tx). For the RX antenna, it is advisable to use an antenna with sensitive characteristics of acceptance, while the TX recommended using this type of antenna to the characteristics of the wave beam elevation angle is low, thus reducing the skip.

There is a repeater that use directional antennas and omni antennas for RX to TX, there are repeaters that use the opposite configuration, depending on the purpose of the use of repeaters.

Duplexer RF VHF UHF

Duplexer RF VHF UHF
duplexer:
A set of cavity filters are tuned such that each frequency mereject tx and rx, so that the antenna can be used for tx and rx at the same time.
RECEIVER CAVITIES        Pass 144.77 MHz     Reject 145.37
TRANSMITTER CAVITIES     Pass 145.37 mHz     Reject 144.77

What is Cavity filter ?

Cavity filter is a tool that serves to hold the unwanted frequencies, and pass a certain frequency. Known as type filter cavity is very sharp (cavity = small hole), is like a very fine filter to filter out unwanted frequencies.

IC Control COR from Motorola

IC Control COR carrier operated relay from Motorola with Pictures. cor is a circuit that serves to connect the two radios, so that when the received radio signal, it automatically re-second radio will transmit the signal.

All About Repeater Radio

Today we will share for you all about repeater.where sharing any info about Radio Deconvolution repeat (RPU) / Repater, COR, Cavity Filter, Duplexer, Antenna and the like ...