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SIMPLEX is a free windows program which transforms any transceiver into an audio repeater. It works on HF, VHF, UHF etc with SSB, CW, FM, packet, SSTV and every modulation mode.

A full line of single-channel synthesized and crystal controlled vhf and uhf fm receivers. Great for repeaters, telemetry, and control applications.

Largest general-purpose ham radio club in Twin Cities. Three repeaters, fully equipped two position HF club station, contesting, field day, and more.

A copper pipe Hentenna for 144 MHz. The Hentenna, a compact, high-gain loop antenna developed in Japan in the 1970s, offers approximately 5.1 dBd gain, comparable to a three-element Yagi. Adapted for 2 meters, it is crafted from copper pipe for simplicity, affordability, and broadband performance. Requiring no feed-point tuning, its construction involves soldering standard copper fittings. Installation demands non-conductive materials to minimize signal disruption. Versatile for vertical or horizontal polarization, it is ideal for FM, repeater, SSB, or CW applications. This design emphasizes practicality and performance for amateur radio enthusiasts

SFFMA 147.000 Repeater audio By KG4LXH

Amateur television Repeater PI6ATS in the middle of the Netherlands. Output in 23 cm band, inputs in 13 cm and 6 cm band. All home made.

This website explains coverage and construction for our repeaters. Includes useful links and an insight into the Ham community in Rhode Island

Running 10 and 6 meters beacons, 6 m and 70 cm fm repeater from Melbourne, Australia

Via this interface you have access to one of the biggest databases on amateur radio voice repeaters.

Dedicated to providing superior FM repeater service to Amateurs in the Washington, D.C. Metropolitan area.

The Central Scotland FM Group has provided and is responsible for maintaining many of the repeaters now operating in West, South-West, Central and East Scotland.

The Anglo Scottish Repeater Group is a voluntary organisation which owns, operates and maintains four amateur radio FM repeaters in North Cumbria.

Small company based in Santa Maria, California, designing and manufacturing electronic products for amateur radio, education, and commercial users. Product line includes APRS devices for real-time vehicle tracking, weather monitoring, and remote telemetry, as well as the ADS-SR1 Simplex Repeater, the ADS-WS1 Weather Station, the SSTVCAM slow-scan TV camera, and GTRANS protocol translator for Garmin FMI.

Creating a 2m Fm Repeater with a Raspberry Pi (B) and a RTL dongle.

Responsible for the operation of amateur radio repeaters GB3FM, GB3FN and GB3FX which are located near Farnham, Surrey in Southern England

The most basic form of repeater receives communication on one frequency and re-transmits at a different frequency. This is known as duplex communication. Repeaters are generally set up to operate with FM modulation on the amateur bands within the VHF (30 MHZ – 300 MHZ) and UHF frequencies (300 MHZ – 3 GHz). These are generally the frequencies used by handheld and mobile devices.

Building a radio repeater enhances communication by extending signal range and overcoming obstacles like mountains or buildings. This guide explains the fundamentals of radio repeaters, their function, and a step-by-step DIY approach. Key steps include conducting a site survey, selecting an optimal installation location, and configuring the system with suitable equipment such as the Retevis RT97 series. Proper placement, antenna setup, and testing ensure effective operation, making this process accessible for enthusiasts aiming to improve communication reliability and range

Ham radio communication in the VHF and UHF bands, which was previously dominated by analog Frequency Modulation (FM), is increasingly incorporating Digital Voice (DV) modes. DV transceivers digitize audio and offer benefits like as signal integrity, encoded caller ID, and bandwidth savings. Today D-STAR, DMR and Yaesu System Fusion (YSF) are popular DV formats, each with its own set of features but mainly incompatible with the others. Internet access with Voice Over Internet Protocol (VoIP) expands DV communication worldwide. Repeaters and personal hotspots expand DV capabilities, enabling seamless worldwide connections. However, implementing DV frequently necessitates learning new technologies and negotiating network complexity.

The PAPA System is a member-supported amateur radio network in Southern California with inter-linked FM, D-STAR, DMR, and P25 repeaters. It provides extensive coverage from Mexico to north of Santa Barbara and from the Arizona border to the Pacific Ocean. Known for its reliability and motto "no call goes unanswered," the network supports casual conversations and emergency operations. Members enjoy using the system, attending events, and building friendships. Monthly meetings in Los Angeles, Orange County, and San Diego feature technology presentations, license testing, and door prizes.