vhf radio

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vhf radio

249 links - and 6 categories

Antennas : J-Pole
  • Exploring The J-Pole Antenna - The J-Pole antenna is a common omnidirectional antenna used in amateur radio, particularly on the VHF and UHF bands. This article is an attempt to explore how the J-pole antenna transforms feed-line impedance to free-space impedance, all the while providing gain found only in the more expensive commercial products.
    [ Hits: 142 | Votes: 0 | Rating: 0 ]
Antennas : Portable
  • An automatically tuned 7 to 30 MHz mobile antenna - For every radio amateur who loves to travel by car, a mobile installation soon becomes a necessity. While in inhabited areas there is usually some coverage of VHF repeaters, in many other places VHF radios are useless. In these very places, HF can provide reliable contacts, and a lot of fun, from anywhere.
    [ Hits: 258 | Votes: 1 | Rating: 10 ]
Antennas : VHF UHF
  • IAT Interactive Antenna Table - IAT is an excel sheet table evaluate parameters of VHF UHF antennas edited by Vladimir UR5EAZ. The difference between this tool and the existing VE7BQH Antenna Table is the use of G / T and C / N instead of the G / Ta parameter. In this table, Vladimir applies the ITU recommendations to assess the noise properties of a radio receiving system and shows the advantage of the G / T concept over the G / Ta concept when choosing an antenna.
    [ Hits: 104 | Votes: 4 | Rating: 9.5 ]
  • Double Quad Antenna for VHF UHF - The structure of this dual band VHF UHF antenna is very simple. It consists of two identical square loops, whose sides measure a quarter wave, connected together at the ends. A project by I5NZR
    [ Hits: 247 | Votes: 6 | Rating: 6.33 ]
DX Resources : Contest : Contest Stations
  • Building a VHF Contest Station - Building an amateur station for competitive radiosport involves a number of critical steps, regardless of the band or bands you focus on. These include, but are certainly not limited to: Station layout, Equipment interconnection and switching, Inter-station interference, Antenna selection. Radio interface with the logging program, CW and voice keyer integration, Rotator control
    [ Hits: 327 | Votes: 1 | Rating: 4 ]
Ham Radio : Clubs : North America : USA : Missouri
  • Central States VHF Society - The Central States VHF Society, Inc. (CSVHFS) is a not-for-profit organization chartered in the state of Missouri. It was begun in the mid-1960s to foster amateur radio operation on the bands above 50 MHz.
    [ Hits: 55 | Votes: 0 | Rating: 0 ]
Ham Radio : Clubs : North America : USA : Utah
  • Bridgerland Amateur Radio Club - We are a group of amateur radio operators located in Northern Utah who enjoy exploring many aspects of the hobby from HF to VHF and beyond. We are active in many public service events, Field Day, APRS, packet, Winlink, contesting and more
    [ Hits: 82 | Votes: 3 | Rating: 10 ]
Internet and Radio : WebSDR
  • SR4DON Web Radio Receiver - OpenWebRX online radio receiver from Olsztyn Poland 10-15 meters bands, 50 MHz VHF UHF bands.
    [ Hits: 183 | Votes: 1 | Rating: 10 ]
Manufacturers : Antennas : HF
  • EPS Antennas - Amateur radio antenna manufacturer, HF VHF UHF antennas, and amateur radio accessories dealer based in Lingen Germany
    [ Hits: 133 | Votes: 2 | Rating: 8 ]
Manufacturers : Antennas : VHF UHF Microwave
  • ANjo Antennen - Amateur radio antenna manufacturer produces mainly VHF UHF beam antennas based in Germany
    [ Hits: 104 | Votes: 1 | Rating: 1 ]
Operating Aids : Grid Squares
  • History of The Amateur radio LOCATOR System  updated - This article taken from the IARU Region 1 VHF handbook, is about the history of the original Locator System named QRA-Locator consisted of just five-character code, two capital letters, a two-digit number and a lower-case letter, like inf example CM72j
    [ Hits: 191 | Votes: 1 | Rating: 1 ]
Operating Modes : Repeaters
  • Ham Radio: Using Repeaters - 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.
    [ Hits: 92 | Votes: 1 | Rating: 8 ]
Propagation : Propagation Forecast
  • Tropospheric Ducting Forecast Europe - The areas noted in the forecast have the necessary atmospheric conditions to produce tropospheric bending of VHF, UHF and/or microwave radio waves. Tropospheric bending extends the range of radio & TV stations well beyond their normal limit and thus increases interference amongst stations as well.
    [ Hits: 152 | Votes: 1 | Rating: 10 ]
Propagation : Resources
  • VHF APRS Propagation Map - VHF – Based on realtime APRS reports. This map shows real-time radio propagation from stations operated near 144 MHz. It uses data gathered by Automatic Packet Reporting System-Internet Service (APRS-IS) from packet stations in the amateur radio service. The map shows activity from the past hour. Paths are smoothed to create a color-coded footprint indicating the distance VHF signals are likely to be traveling.
    [ Hits: 308 | Votes: 0 | Rating: 0 ]
Radio Equipment : HF Transceivers : Icom IC-705
  • ICOM IC-705 and Raspberry Pi - A portable setup of the ICOM IC-705 with portable VHF UHF and and HF Alex Loop antenna, managed with a portable Raspberry PI 3 setup.
    [ Hits: 254 | Votes: 2 | Rating: 10 ]
Radio Scanning : Scanner Frequencies
  • Scanning frequencies - HF digital mode transmissions, voice transmissions in HF and VHF Bands collected in several XLS files by Relic Radio communications
    [ Hits: 136 | Votes: 0 | Rating: 0 ]
Software : DX Cluster
  • DXSPOTS - DXSPOTS is a Telnet connection program. It allows radio amateurs with a lot of DX traffic to know instantly the status of the bands and to know which DX are currently on the air. Following the Packet-Clusters where data was transmitted on VHF/UHF via dedicated relays and sometimes on HF at a very low speed (300Bds on HF), the Internet has taken over and is now transmitting DX information via the computers in most shacks. Translated with www.DeepL.com/Translator (free version)
    [ Hits: 146 | Votes: 0 | Rating: 0 ]
Software : Log Analysis
  • ARTIC Contest Log Checker - Artic is a program dedicated to amateur radio contest log checkers, mainly in Italian offers log checking function for VHF contests like IAC in Italy and SWAC in Switzerland
    [ Hits: 122 | Votes: 1 | Rating: 10 ]
Technical Reference : Software Defined Radio : RTLSDR
  • How RTL-SDR dongles work - Since 2012, the RTL-SDR is the simple and cheap way to give Software-Defined Radio a try. For about 25 euro you get a receiver covering much of the VHF and UHF range, and by either adding an upconverter, or using the direct sampling option, also the HF bands. They are so cheap because they are mass-produced as DVB-T receivers.
    [ Hits: 128 | Votes: 1 | Rating: 10 ]
Technical Reference : Transverters
  • 2m to 70cm Transverter Circuit - A 70cm / 432 MHz Transverter Project transverter circuit is an electronic device that converts a radio signal from the 2 meter to the 70 centimeter band and vice versa, allowing a single transmitter/receiver to be used for both bands. It consists of an IF stage, local oscillator, frequency multiplier, and amplifier. The circuit must be designed for minimal signal loss, noise and intermodulation distortion.
    [ Hits: 77 | Votes: 0 | Rating: 0 ]

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