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Presents the official download hub for the _Fldigi_ suite of amateur radio software, detailing its core components and associated utilities. The resource provides direct access to executables and source code for Linux, FreeBSD, macOS, and Windows operating systems, alongside comprehensive documentation in PDF format for each application. Specific version numbers and release dates are listed for _Fldigi_, _Flrig_, _Flmsg_, _Fllog_, _Flnet_, _Flaa_, and other tools, indicating active development and maintenance. It outlines the distinct functions of each program, such as _Fldigi_ for digital modem operations, _Flrig_ for transceiver control, and _Flmsg_ for NBEMS messaging. The site also references support communities on groups.io for Linux, NBEMS, and Windows users, fostering a collaborative environment for troubleshooting and usage guidance. Furthermore, it links to third-party repositories and mirrors, including SourceForge, for alternative download options and distribution-specific packages like RPMs for OpenSUSE and COPR for Fedora. The resource also includes links to _RigCat_ XML files for transceiver control configurations and a dedicated Wiki for _Fldigi_, offering additional technical insights and build instructions. This centralized repository serves as the primary distribution point for the W1HKJ software ecosystem, ensuring users can access current versions and support materials. -
CHIRP is a free, open-source, cross-platform radio programming tool that supports a large number of transceivers from manufacturers such as Icom, Kenwood, Yaesu, Alinco, Wouxun, Puxing, and Baofeng. Chirp radio software run on Windows, Linux, and macOS, enabling users to exchange data between different radio models and interface with multiple data sources and formats. The program streamlines the configuration of memory channels, frequencies, and various settings for amateur radio handhelds. Specific models supported include the _Icom IC-7300_, _Kenwood TH-D74_, and _Yaesu FT-818_, among many others. CHIRP provides compatibility with various file formats, including Generic CSV, RT Systems CSV, ARRL Travel Plus (.tpe), and manufacturer-specific formats like Kenwood KPG-44D (.dat) and Icom Data Files (.icf). Additionally, it integrates with the DMR-MARC Database for enhanced programming capabilities. Users can download CHIRP for their platform and access extensive documentation, including a FAQ and a mailing list for support. The project encourages users to consult existing documentation and open/closed tickets before submitting new bug reports or feature requests. -
Manual for R7, 10 12 15 16 20 30 40 meters band antenna -
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A guide for users of Ubuntu amateur radio software General support of Amateur Radio using Ubuntu /Linux. -
Wikipedia page about collinear antenna arrays -
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APRSISCE/32 is an Automatic Packet Reporting System (APRS) program, primarily intended for Windows and Windows Mobile (CE), although it will run on Linux and Mac OS under wine. Offer enhanced messaging, announcement support via ANSRVR, and QRU for object query support, can run as a highly configurable Digipeater -
The RTL-SDR software by Osmocom, allow DVB-T dongles based on the Realtek RTL2832U to be used as a cheap SDR. -
HFUnderground.com is dedicated to documenting longwave, mediumwave, and shortwave stations, including broadcasters, utility/military stations, pirate radio and spy numbers stations. -
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Info about Yaesu VX-8R by APRS Wiki -
The rhombic antenna is a diamond-shaped antenna, suspended between 4 masts. -
Notes on using the Kenwood TH-D7 -
TAHO.EXE, an open-source software, facilitates the creation of APRS maps for _UI-View_ by converting free data from _OpenStreetMap_ into the required *.JPG and *.INF file formats. This utility, developed by Dimitri Junker with specific UI-View format support added at the request of HB9DTX, streamlines the process of integrating detailed geographical information into the _UI-View_ platform. It operates on Windows, generating map files with border coordinates in just a few clicks, eliminating the tedious manual creation of *.INF files for custom maps. This converter allows UI-View users to leverage the continuously updated and community-contributed data of OpenStreetMap, which often surpasses commercial map quality in specific regions. The process is straightforward, with a detailed step-by-step guide available on the OpenStreetMap wiki, translated into French and German. TAHO.EXE significantly enhances the utility of UI-View by providing a readily accessible and continuously improving source of detailed, current geographical maps for displaying APRS station positions and objects. -
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Wikipedia page about regenerative circuits in designing receivers. -
Wikipedia page dedicated to the popular Yaesu VX-2R transceiver, include informations on modification. -
VSP Manager is a software program that creates serial port pairs which allows software programs to talk to each other using Cat commands. This virtual com port emulator is offered FREE to Ham Radio Operators. -
The people listed here have volunteered to issue IP addresses for their areas -
An Arduino TNC modem project based on KI4MCW source code with pictures and schematics -
Hamlib is a library aid for software developers wishing to incorporate control of amateur radio hardware into their programs. Hamlib will allow ham radio software authors to concentrate on the user interface and the basic function of the program rather than radio control. -
Yet another wiki page about the yaesu VX-2 hand-held transceiver. -
MUlti mode digital signal decoder software capable or C4FM D-Star decoding, a guide to compile and install DSD -
According to wikipedia a software-defined radio is a radio communication system which uses software for modulation/demodulation of signals -
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Wiki Site dedicated to radio scanning info in New Zealand -
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This wiki is intended to help identify radio signals through example sounds and waterfall images. Most signals are received and recorded using a software defined radio -
The Kenwood TS-2000 page at wikipedia -
Details the construction of an **HF converter** designed by M1GEO, George Smart, specifically to extend the frequency range of the FunCube Dongle Pro (FCD) for amateur radio reception. The FCD natively covers 64 to 1,700 MHz, but this project enables reception from 0 Hz to 64 MHz by up-converting signals to the FCD's operational range. It employs a **double-balanced mixer** with a 100 MHz local oscillator (LO) to translate incoming HF signals; for instance, a 1 MHz signal appears at 101 MHz within the FCD's passband. The design incorporates a 7th-order Chebyshev low-pass filter with a 62 MHz cutoff frequency at the input to mitigate image frequencies, ensuring cleaner spectral presentation. George provides the schematic, PCB masks, and Gerber files for replication, noting that Far Circuits also offers PCBs. The resource includes test results for the low-pass filter and measurements of LO leakage, identifying -36.8 dBm at 100 MHz as a potential sensitivity concern. M1GEO discusses potential improvements, such as adjusting the mixer's LO drive, adding a balance pot, or incorporating a post-mixer high-pass filter to reduce LO breakthrough. Audio recordings from 40m and 17m demonstrate the converter's performance with WRplus SDR software. -
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Wikipedia page about amateur radio spectrum assigned to the amateur radio service -
Instructions on how programming a regency scanner model R1060 -
CASPERARC amateur radio club in Casper Wyoming -
The complete Bozo's guide to JT65A by K3UK, learn how to install and operate WSJT software and start making QSO in weak signals operating modes -
The 160-meter amateur radio band, spanning 1.8 to 2 MHz, was historically the lowest frequency amateur allocation until the introduction of the 630-meter and 2200-meter bands. ITU Region 1 allocates 1.81–2 MHz, while other regions use 1.8–2 MHz. This band, often called "Top Band" or "Gentleman's Band," was established by the International Radiotelegraph Conference in Washington, D.C., on October 4, 1927, with an initial allocation of 1.715–2 MHz. Effective operation on 160 meters presents significant challenges due to the large antenna sizes required; a quarter-wavelength monopole is over 130 feet, and horizontal dipoles need similar heights. Propagation is typically local during the day, but long-distance contacts are common at night, especially around sunrise and sunset, and during solar minimums. The band experienced a resurgence after the LORAN-A system was phased out in North America in December 1980, leading to the removal of power restrictions. -
What Are Pirate Radio Stations and Why Listen to Pirate Radio Stations, How to Listen To Pirate Radio Stations -
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How to compile and configure WSPR on a Raspberry Pi -
How to build a Bluetooth Radio Interface for Yaesu CAT standard or Icom CI-V system -
Commonly used abbreviations in morse code operations -
Contesting (also known as radiosport) is a competitive activity pursued by amateur radio operators, read more about contesting at wikipedia -
A cavity filter, often a critical component in _duplexer_ designs, functions as a sharply tuned resonant circuit, allowing only specific frequencies to pass while attenuating others. These filters are essential for maintaining signal integrity in environments where multiple transmitters and receivers operate simultaneously on closely spaced frequencies, such as in repeater stations. The article details how these filters, sometimes referred to as _notch filters_, achieve high Q factors, which are crucial for their performance. Understanding the principles of cavity filters is fundamental for any amateur radio operator involved in repeater operation or designing custom RF front-ends. The discussion covers the basic circuitry and operational characteristics that enable these devices to provide significant isolation, often achieving **-80 dB** or more between transmit and receive paths. This level of isolation is vital for preventing receiver desensitization and intermodulation distortion. Properly tuned cavity filters ensure that a repeater can transmit and receive simultaneously on different frequencies without self-interference, a common challenge in VHF/UHF operations. -
Wikipedia page on Notch filter, a narrow stopband - high Q factor filter -
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