hf radio
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Antennas : Horn- What is Horn Antenna
- Horn Antenna - The energy of the beam when slowly transform into radiation, the losses are reduced and the focussing of the beam improves. A Horn antenna may be considered as a flared out wave guide, by which the directivity is improved and the diffraction is reduced. One of the first horn antennas was constructed in 1897 by Bengali-Indian radio researcher Jagadish Chandra Bose in his pioneering experiments with microwaves. The modern horn antenna was invented independently in 1938 by Wilmer Barrow and G. C. Southworth. This Horn model antenna is suitable employed in the UHF or SHF radio bands. Making this horn model antenna it will be easy for a beginner to make if it works in the 10GHz frequency, because small dimensions so it is not so difficult and also offers gain up to 25dBi.
[ Hits: 74 | Votes: 0 | Rating: 0 ]
- Build this Vertical Portable HF Antenna
- An experimental prototype of an asymmetrical hatted vertical dipole antenna that can work on HF bands 20 to 10 meters band. The AHVD Vertical dipole is an upside-down T design
[ Hits: 373 | Votes: 3 | Rating: 9.67 ]
- RX Loop antenna
- This loop antenna is intended to be connected as an antenna for receivers that do not have a built-in antenna such as an HF set or an old tube radio. This square barrel is wound on a wooden frame.
It consists of two windings that are galvanically isolated from each other, a main and a coupling winding. The diameter is about 40 cm.
[ Hits: 60 | Votes: 0 | Rating: 0 ]
- HF DXView Propagation Map
- This map shows real-time radio propagation from stations operating on 11 bands between 1.8 and 54 MHz in the amateur radio service. The display shows world-wide activity from the last 15 minutes and is automatically updated about every minute. Data for the map is gathered from several online sources: WSPRnet, Reverse Beacon Network (CW, FT4, FT8), PskReporter, and DX Cluster.
[ Hits: 299 | Votes: 5 | Rating: 7.6 ]
- 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 ]
- DK0TE Mobile version WebSDR Germany
- This is the mobile version of the DK0TE WebSDR providing HF ham radio bands coverage.
[ Hits: 176 | Votes: 2 | Rating: 5.5 ]
- Pro Audio Engineering
- High-quality products for broadcast and amateur radio. Kx33 Low-RFI AC Power Supply for HF Transceivers, Elecraft Heatsinks, Fair-Rite Mix 31 Ferrites
[ Hits: 118 | Votes: 0 | Rating: 0 ]
- Pocher Antenne
- Amateur radio antennas manufacturer. Produces HF end-fed, dipoles, and other wire antenna types, mono band and multi band antennas.
[ Hits: 113 | Votes: 1 | Rating: 2 ]
- 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 ]
- ANjo Antennen
- Amateur radio antenna manufacturer produces mainly VHF UHF beam antennas based in Germany
[ Hits: 104 | Votes: 1 | Rating: 1 ]
- Setting Up Your HF Station
- From buying an amateur radio transceiver, choosing the correct power supply, selecting the antenna and its feed line, to choosing the best microphone and accessories. A nice presentation for beginners.
[ Hits: 187 | Votes: 2 | Rating: 8.5 ]
- Aircraft Scatter ACS
- Getting started with Aircraft scatter, defined as the process of scatter radio waves of the body of a traveling aircraft in order to enhance the distance possible to bridge on VHF, UHF and microwaves. The ACS path, Equipment requirement and Operating techniques
[ Hits: 54 | Votes: 0 | Rating: 0 ]
- 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 ]
- UK Scanner Frequencies
- UK frequency list provide reference table to lister to Police scanner channels UHF VHF, Amateur Repeaters, Ambulance CB Radio CoastGuard Rescue, marine VHF, Military and more.
[ Hits: 148 | Votes: 1 | Rating: 1 ]
- 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 ]
- Proplab-Pro
- Ray-trace radio signals through a realistic three-dimensional ionosphere using Proplab-Pro. This software has been used by the military, researchers, universities and amateur radio operators around the world to assist in determining radio propagation conditions and radio signal behavior. It is one of the most respected and well established software packages for radio engineers and enthusiasts, being actively updated for over 28 years.
[ Hits: 168 | Votes: 0 | Rating: 0 ]
- 20 W HF Power Amplifier
- A HF power amplifier with a push-pull of AFT09MS015N. The (small-signal) gain of the amplifier is around 26 dB in the lower HF band and goes down to about 24 dB on the higher end and still around 21 dB at 50 MHz. Its input matching is relatively good at the lower HF and degrades above 10 MHz.
[ Hits: 169 | Votes: 0 | Rating: 0 ]
- Stop RFI from Solar PV Systems
- Stop EMI RFI Interference in Off Grid Solar PV Systems, in this article the author provides hints on tracking down the EMI or RFI source, shielding and grounding in order to eliminate interferences on the whole HF and VHF ham radio bands
[ Hits: 80 | Votes: 0 | Rating: 0 ]
- 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 ]
- 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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