Amateur 2-meter repeaters have a separation of only 0.4 percent, or 600 kHz. A decrease in frequency separation makes the job of providing good isolation even more difficult. A duplexer must meet some basic requirements. It must attenuate the transmitter carrier, this prevents receiver overloading, which in turn would reduce receiver sensitivity.

Jan 19, 2025 · In this post I have explained the complete building procedure of a 2-meter amateur ham radio transmitter circuit, using ordinary electronic components and

Jan 4, 2024 · In this post I have explained a simple radio repeater circuit which can be built by any new hobbyist or a radio amateur for communicating over long distances using ordinary transmitters and radio receivers. In this article we are going to see what radio repeater is, how it works and how to build one in a hobby lab.

Aug 2, 2018 · Looking for ideas to make a backyard repeater by using 2 mobile radios or one mobile and a handheld with an actual controller. Can anyone give me some...

Feb 13, 2023 · The old one had lost its radials and I wasn’t able to hit the various amateur radio repeaters around. So being one who likes to build antennas, here is what I came up with. The Image below shows the materials you will need to build a 2 meter vertical antenna for the 146 mHz. amateur radio band.

Title: A Homemade Duplexer for 2-Meter Repeaters Author: epb Created Date: 3/2/2001 8:35:26 AM

Aug 15, 2014 · The solution to the repeater problems is in using very selective band-pass and/or notch filters, which is what cavity resonators do. For a 2m repeater, the TX and RX signals are 600 kHz apart, very close at VHF, there expensive.

Sep 19, 2015 · This is a fun, almost novice-level construction project for anyone who has a 2-meter ham radio walkie talkie (e.g., the $26 BaoFeng UV5R) and would like more effective range without having to buy an amplifier. If you are currently using a short rubber-duckie antenna, this high-gain yagi antenna may well make your radio appear to have 6-10 times ...

On a typical two-way hilltop, cavity duplexers are as common as the forest of antennas that bristle from the towers. Most repeaters have one. They’re well known to repeater owners and builders. Or are they? Don’t be so sure. If you are like many hams and two-way radio professionals, you likely have more questions about duplexers then answers.

We’ll look at what a radio repeater is, how it works, and how to make one DIY repeater in this post. Finally, using the proposed full-duplex communicator architecture in this article, you will be able to construct a mini repeater station.