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Radio propagation prediction and simulation tool for VHF-UHF, based on the Irregular Terrain Model, also known as Longley-Rice. Can be used as a repeater site planing tool and radio coverage analysis. Currently it works on Linux and Windows. -
Antenna support engineering, manufacturer of antenna masts, supports, towers, self-supporting towers, telescopic masts, rooftops and wall supports -
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The page provides detailed instructions on how to build a double bazooka antenna for the 40 meters band. It includes information on materials needed, measurements, and assembly steps. The antenna can be configured as an extended dipole or an inverted V, offering low noise, wide bandwidth, and a 1:1 standing wave ratio. The content also offers calculations for other bands and includes photos of the antenna fabrication process. -
WA2UGT X-beam antenna for 17 meters band -
HF Antennas, magnetic loop antenna, based in Italy -
HA2NON W3DZZ antenna project with pictures and construction details -
A full featured Receiver Controller for TenTec Rx320 with Audio Processor, digital modes decoder, ILG DataBase Manager and much more. Support for Drake R8A/B,ICOM PCR-1000, ICOM R756Pro and ICOM R756 Pro I ICOM IC-R75, JRC NRD-535, Kenwood R5000, TenTec RX320(D) and TenTec RX350D receivers -
Free Windows ADS-B decoder for RTL-SDR dongles included in SDR#. It allow to broadcast data locally or to radar software sever such as Planeplotter, Virtual Radar Server, adsbSCOPE. -
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You will find on these pages my experiences and results on antennas and local/non-local QRM/noise reduction. Using a broadband vertical active magnetic loop and a home made / designed broadband amplifier. Two vertical magnetic Alford loops are used in an array. Analog and Digital Signal Processing and a dual phase coherent Software Defined Radio (SDR) are used. By PA0SIM -
adsbScope is a freeware Windows application designed for processing _ADS-B_ (Automatic Dependent Surveillance-Broadcast) frames received from a compatible decoder. It identifies aircraft, calculates their real-time positions, and presents flight parameters in both alphanumeric tables and a graphical display. The software interfaces via a virtual COM port, receiving raw frames to provide detailed situational awareness, including a global coordinate grid, continental coastlines, over 4,000 **airport** locations, and major cities. Users can overlay OpenStreetMap tiles and view world state boundaries, with each tracked aircraft rendered with labels showing altitude, speed, heading, squawk code, and flight identifiers. When paired with the adsbPIC-decoder, adsbScope enables advanced hardware control, allowing users to toggle data filters for specific frames like DF17/18/19, adjust analog signal thresholds for reception fine-tuning, and manage system resets or bootloader activation directly from the PC. This functionality provides a customizable toolkit for hobbyist radar listeners, offering a robust alternative to commercial tools for processing aircraft data. The software displays up to **1090 MHz** transponder data and can track aircraft up to 250 nautical miles. -
HF Digital Voice for Radio Amateurs. FreeDV is a free application for Windows, Linux and MacOS that allows any SSB radio to be used for low bit rate digital voice. -
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Presents G0GSF Brian's ZS6BKW antenna, a refined iteration of the classic G5RV, offering improved performance across multiple HF bands. The design emphasizes specific radiator and ladder line lengths to achieve lower SWR on 40m, 20m, 17m, 12m, and 10m, making it a practical choice for operators seeking a single wire antenna solution. The document includes critical dimensions for the flat-top and the 450-ohm ladder line section, which are key to its multiband resonance characteristics. Unlike the original G5RV, the ZS6BKW aims for direct 50-ohm feedpoint impedance on several bands, reducing the need for an external antenna tuner. My field experience with similar optimized dipoles confirms that precise construction, particularly the ladder line length, is paramount for realizing the intended SWR benefits. This design offers a compelling alternative for hams with limited space or those preferring a less complex antenna system. -
Listen to the DSTAR Repeater from Florida USA currently connected to Reflector 1c -
WinPSKse is a logical outgrowth of WinPSK as designed and written by AE4JY. The look and feel is intentionally similar, but some significant changes have been made, not the least of which is the ability toreceive two PSK31 signals simultaneously. -
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Mobile Antennas, mini magnet antennas, handheld antennas, by Reuex industrial -
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Dedicated to Yaesu FT847 with mods infos and links... by F1MDT -
Monitoring Times, SWL, BCL, montly reports, Broadcast band, satellite television, long-wave coverage, Reviews of new products and radio-related software. -
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Constructing a **2-meter** J-pole antenna from readily available copper plumbing components offers a robust and cost-effective solution for VHF operation. This design, dubbed the "Plumber's Delight," functions essentially as a half-wave dipole fed by 50-ohm coax via a **gamma match**. It incorporates a quarter-wave copper tubing support, which, when affixed to a metal mast or tower, enhances forward power in the direction of the radiating elements. The original configuration utilized a small ceramic trimmer capacitor for the gamma match, suitable for up to 10 watts. A subsequent modification replaced this with a 50 pF variable capacitor housed in a plastic enclosure, accommodating higher RF power and improving weather resistance. The antenna elements are secured using a copper "T" fitting, and an SO-239 connector mounts directly to this fitting. Performance includes gain away from the support mast, and tuning is straightforward by adjusting the gamma match capacitor for a 1:1 SWR. The total cost for materials, excluding the capacitor and coax, can be under $10. -
On the Satellitenprogram of DJ0SX Peter one can provide time schedules for over 500 satellites or count 23 satellites real-time imTextmode. The large advantage exists in thought out and of long observation practice which are due flexibility in the selection and the requirements to a satellite program. The program runs under Windows 95/98, NT, XP, 2000 -
Modification to the Bearcat 210 scanner for reception of 137 Mhz FM is a fairly simple process. -
A large collection of amateur radio maps, including CQ and ITU Zones, a complete set of ham radio Prefix Maps, grid locators and time zones map. An excellent ham radio mapping service. -
Signals Analyzer it's a a program, which is designed for the very qualitative analysis of different signals. The one of main fields of SA application is the analysis of unknown or unclear, strange signals. This programm will be very usefull to everyone from professional analysts to amateurs. -
Based on a W4TWW project and modified by KN4LF -
These omnidirectional antennas offer Horizontal polarization, and about 2.1 dbd of gain. They are much quieter than a dipole or a vertical, have a broader bandwidth and will usually out perform a dipole antenna. -
V26B Superstation available for rent. Click the link "information about renting the V26B station" for more information. -
1500 Watt HF power amplifier -
CAT control and logging software project especially developed for the YAESU FT-100 transceiver. The program is based on the design of FT847-SuperControl. -
Program to demodulate NOAA, Okean, Meteor 3-5 and Resurs signals without the bent verticals resulting from WXSat. -
Morse Tutor Gold by GGTE Quality Software for Amateur Radio. -
This project describes an ARDUINO based automatic antenna tuner, for an end-fed half wave (EFHW) antenna, working on 20 & 40 meter bands -
If you have ever tried transmitting on HF from a tall block of apartments, where it's just not possible to erect a substantial aerial system, then this article is for you -
Collectible,antique, Radio Tubes, special purpose and audio electron tubes and literature. -
An excellent all-around 40 meter antenna for those who don't have room for a multi element yagi antenna -
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RTTY SSTV PSK31 MFSK MT63 PACKET APRS and more... -
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Unified Microsystems presents a range of amateur radio products, notably the **XT-4 MK2 CW Memory Keyer**, a battery-powered iambic keyer designed for portable operations like Field Day, POTA, SOTA, and DXpeditions. It features four non-volatile memories, each storing approximately 240 Morse characters, and operates at speeds from 8-45 WPM. The XT-4 MK2 also includes an auto power save function and paddle reverse, making it adaptable for multi-operator setups. Beyond the XT-4 MK2, the site details the **W9XT Contest Card**, a PC plug-in board offering DVK and CW interface capabilities, allowing operators to record and playback CQs and contest exchanges. Other offerings include the BevFlex-4X RX Antenna System, RAS-4 RX Antenna Switch, VK-64 Voice CW Keyer, and various USB interfaces. Additional products cover electronic development, such as the ATS-1 Terminal Shield for Arduino™ and VR-X Power Supply Voltage Regulators, demonstrating a broader scope beyond just operating accessories. The XT-4Beacon MK2 / CW IDer is also highlighted for beacon projects, capable of storing messages up to 5 minutes at 25 WPM. -
A Bencher antenna divsion, manufacturer of HF YAGI and Vertical antennas -
Italian page including pictures schematics diagrams of an home made linear amplifier using four EL509 in parallel. Output power is about 700W. -
A 3 element yagi beam for 40 meters band -
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These pages provide general propagation advice for HF communicators. Information available includes inferred global propagation conditions, real time HF fadeout coverage charts, regional ionospheric vertical MUF maps and Hourly Area Prediction charts for Astralia and Asia, Europe and North America -
This project is about a cheap way of building a colinear antenna for VHF 145MHz, and having about 10dB more gain than that little 1/4-wave magmount