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Audio Kit is a collection of four iphone applications which are essential for those working in audio and sound. A real time Spectrum Analyser, a Scope to display waveforms, an SPL Meter, and a sine wave Signal Generator.

AGWTracker APRS program with lot's of features, map display, and more

This free PDF file contains two Worldwide grid square maps. The first map displays the fields (first two letters of a maidenhead locator) while the second includes also squares (third and fourth digit) and it can be useful to determine what is your ham radio grid square. PDF file can be enlarged and scaled to A3 and higher dimensions.

eQSLMaster is a HAM radio program, that allow to perform various functions using the Electronic QSL Card Centre (eQSL.cc). With eQSLMaster users of the eQSL.cc system have the ability to upload an entire ADIF format log file (or single QSO) and have it deposited into eQSL central database using LogServices.

3 MHz to 30 MHz, the shortwave bands offer a vast array of international broadcast stations, maritime communications, and amateur radio signals, often heard far beyond the typical range of AM/FM. This resource introduces shortwave listening (SWLing) by explaining what shortwave radio is, how signals propagate via the **ionosphere**, and the general characteristics of different shortwave bands. It details how international broadcasters like Radio Australia and Deutsche Welle transmit in multiple languages, including English, and discusses the real-time nature of these over-the-air transmissions compared to internet streams. The guide provides practical tips for better reception, such as tuning between 9 MHz and 12 MHz during daylight hours and below 9 MHz at night, and notes the presence of amateur radio operators on the 75/80 meter band (3.5 MHz to 4.0 MHz) using **LSB** mode. It reviews popular portable shortwave receivers, specifically highlighting the Sangean ATS-505 and the Sony ICF SW 7600GR, comparing their features like synchronous detection and filter choices. The article also suggests audio enhancement methods, such as external amplified speakers or quality headphones, and briefly mentions high-end receivers like the AOR AR8600MKIIB for advanced monitoring.

Dual band J pole operational over the entire 6Mtr band (50 - 54MHz) and the entire 2Mtr band (144 - 148MHz), slightly favouring the upper half of both bands by VK6YSF

This is a collection of articles, generally from QRP-L, about QRP operations and portable antennas. However, anything that looks interesting to me might end up here. These articles are posted here primarily for my own use; however, all are free to browse.

A program to decode Morse code via sound input of PDA to text. No additional hardware required - your need only receiver and PDA with sound input. Built-in microphone of device can be used also.

A worldwide map, dated 2002, visually presents aeronautical service frequency allocations across the **HF bands**. This resource details specific frequencies and their designated uses within the aviation sector, providing a geographical context for air traffic control, air-to-air, and air-to-ground communications. It serves as a reference for understanding the structured use of the radio spectrum by aircraft and ground stations globally, particularly for those interested in **radio scanning** or monitoring aviation communications. The map's utility extends to identifying regions and specific frequency ranges where aeronautical activity is concentrated, offering insights into international aviation communication protocols. While dated 2002, it provides a historical snapshot of spectrum management, allowing for comparisons with current allocations and practices. This visual aid assists in pinpointing potential listening targets for scanner operators and those studying spectrum utilization.

Buildin a VHF Jpole antenna with detailed pictures

Tucson Police and EMS live scanner audio feed on radioreference.com

Icom, Yaesu, Alinco, Cte, Comet, Jrc, Standard, Uniden, Kenwood italian dealer

Designing quagi and yagi antennas on 2 Meters, some preliminary notes by Cebik, W4RNL

Broadband active loop antennas for radio amateurs and hobbyists

The Ohio/Penn DX Bulletin is freely distributed on the Internet and packet clusters around the world, by Tedd Mirgliotta, KB8NW. Published almost on weehly basis the OPDX is one of the oldest DX news list on the internet.

An interesting rotator interface that interfaces a pc to a rotor or rotator controller, emulating a Yaesu GS-232A/B and Easycom protocols, made with Arduino

Great first time J-pole project. Covers most of the basics. This small and thin design also makes it good for several stealth applications.

A Primer for the new Packet Radio operator

Fatpigdog's Real Time FFT Audio Spectrum Analyzer. User interface has the look and Feel of an HP Spectrum Analyzer. But, in addition to the regular Spectrum Plot, it also produces detailed Waterfall plots. The user can optimize the color map, chosing from a wide assortment of color themes. This analyzer supports multiple traces, trace arithmetic and normalization.

A new method of feeding a dipole with toroids.

Live scanner feed and police and fire feeds

A 3.42-meter (11-foot 2-inch) extended-length mobile antenna project is presented, detailing its evolution from an initial 1.65-meter design. W5JGV shares his journey in optimizing mobile HF performance, noting that increasing the top whip length significantly improved radiation efficiency by reducing coil losses and allowing for larger wire gauges. The article includes a comparative table illustrating substantial gain increases, with the 3.42-meter version showing up to 40.6% efficiency on 21.2 MHz compared to a half-wave dipole. Construction details are thoroughly documented, from the use of hard-wall copper pipe for mast sections to the fabrication of custom loading coils. The author explains the necessity of an insulating brace for self-supporting coils and details a unique rotational alignment mechanism for off-center mounted coils to prevent snagging on overhead obstructions. He also describes a "Z" winding technique for 75-meter and 160-meter coils, which minimizes copper losses and manages dielectric losses. The resource provides specific loading coil data, including wire gauge, number of turns, coil length, and inductance values for bands from 18 MHz down to 2 MHz. It emphasizes that these coils may require fine-tuning based on individual vehicle and whip configurations, suggesting an antenna tuner for optimal mobile station operation across multiple HF bands.

A Center-Fed Half-Wave Dipole is probably the simplest of antennas to construct and use. It is usually suspended between two supports, from it's end insulators, and has the feedline hanging from the center.

The mirror-image J-Pole is very easy to construct and requires only two T-Fittings plus a length of copper pipe.

A really simple receiving antenna for 80 and 160 meter dxing by WA2WVL

Comprehesive page on TS-940 TS-940 reference maintained by ZL4AI Jeff

Official ICOM distributor for The Netherlands, Belgium and Luxembourg

Eighteen-part tutorial on packet radio in HTML and ASCII format from Larry Kenney, WB9LOZ

Over 75 years of engineering expertise underpins Bird Electronic's offerings in RF power measurement, critical for maintaining peak performance in amateur radio stations and professional communication systems. The company specializes in a range of test equipment, including wattmeters, SWR meters, and antenna analyzers, essential for optimizing antenna systems and ensuring efficient power transfer. Their product line extends to various RF components such as filters, cables, and connectors, all designed to meet stringent technical specifications for reliability and accuracy across diverse frequency bands. Bird Electronic's instruments, like the _Bird 43_ Thruline Wattmeter, are widely recognized for their robust construction and precise measurement capabilities, providing hams with confidence in their station's operational parameters. These tools enable accurate assessment of forward and reflected power, SWR, and modulation characteristics, which are vital for troubleshooting and maximizing radiated power. The company's commitment to innovation ensures that its products remain relevant for modern RF challenges, from HF through microwave applications, supporting both traditional analog and advanced digital modes.

Experience of band filters, for a contest multi operator enviroenment

PC power supply conversion for ham radio use. Slide show overview showing how convert PC Power supplies to ham radio use presented at the August 2007 FSARC meeting.

A web site offering a QRZ.com integrated mapping service. Allows creating a google map of your QSOs adding a list of QSOs manually or importing an ADIF log file. Registration and a QRZ.com account is required.

homebrew satellite antenna

Sells leading-edge voice and digital communications products to the world-wide military, government, industrial, and amateur radio marketplaces. Bluetooth Remote Audio/PTT, Rig Controller with Audio & PTT , HamLinkUSB Rig Control, Noise filtersm antenna analyzers, Multimode Data Controller, TNC, Packet Radio Terminal Node Controller. USB2RS232

The function of the calculator is to give all of the needed sizing to construct a good 5 element quad antenna for amateur radio use.

When one operates at low power on SSB, speech processing becomes almost essential to get through the QRM. The circuit is a low cost speech processor that will perform well with a minimum of construction effort.

IC 706 modifications collected by mods.dk

Map of USA Districts

Portable Vertical Antenna for 75m and 40m featuring Low radiation angle for DX, easy to install and to match 50 ohms

Dual band rectangular loop antenna for 15m and 10m

BesserNet Reflectometer is a fun SWR calculator and simulator Java applet

Active digital mode frequency list compiled by Jason Buchanan - N1SU

Repeaters, transmitters, receivers, small power Amps and Controllers

N6RK receive only loop antenna

HotPaw MorseDecoder, an iOS application, provides real-time translation of Morse Code audio signals into plain text, leveraging the device's microphone or headset input. It incorporates a DSP narrow-band audio filter, adjustable from 300 to 2400 Hz, to mitigate background noise and QRM, enhancing signal clarity for decoding. The application offers both an automatic decoding mode and manual controls for fine-tuning parameters such as audio filter frequency, WPM dot/dash speed, noise threshold, and Farnsworth timing. The WPM detection automatically adapts from 8 to 40 WPM, with a QRQ High Speed mode extending this range to 30-80 WPM for faster code. A built-in spectrogram aids in identifying the precise audio frequency of the CW tones. User feedback indicates effective performance with various transceivers like the Yaesu FT-857 and Icom IC-R8600, particularly when manual settings are optimized. The app's ability to visually tune stations within the passband and decode speeds beyond an operator's manual capability has proven beneficial during contests and general QRP operation.

The "Tenna Dipper" is a low power antenna analyzer and ATU tuning aid. With this handy accessory, you can determine the 50 Ohm resonance frequency of antennas or you can adjust your antenna tuner for a 50 Ohm match without generating QRM

The Packet Terminal Driver program is a general purpose communications package for communicating with a packet TNC attached to your IBM-PC/clone. The program was written to work with the Kantronics range of TNC's but should work with any TNC that is connected to a serial port on your computer.

G8OFZ multi-band antenna for 80-10m, this antenna appears to be a derivative of the Doublet and the Classic G5RV

This is an antenna that author just built. Was intend for receiving the AO-27 downlink (at 436.800 +/- doppler). It is built with right hand circular polarization, and the gain is supposed to be in the neighborhood of 3 DB.

A web site dedicated to the K3LR contest station, a Multi Multi Station with 9 towers located in Western Pennsylvania. It provides information about the station components, antenna construction company, radio equipment used, and upcoming events like the Top Band Dinner at Dayton. The site also includes links to related resources like Contest University, Dayton Contest Dinner, and World Wide Radio Operators Foundation. The intended audience is amateur radio operators interested in contesting and DXing. The content is focused on promoting the K3LR station and sharing news and updates related to its activities.