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Analog circuit simulator for Windows (not a SPICE). A great tool for students, amateurs, as well as for experienced engineers. Free Demo.

DX Finder presents a real-time DX cluster service tailored for amateur radio operators engaged in DX chasing and contesting. The platform aggregates DX spots, Reverse Beacon Network (RBN) data, and PSK Reporter information, displaying current activity across various amateur bands. It provides a centralized interface for monitoring propagation conditions and identifying rare DX entities, aiding operators in making timely contacts. The service integrates multiple data streams to offer a comprehensive view of global amateur radio activity. Users can access real-time spotting data, which includes callsigns, frequencies, modes, and signal reports, facilitating efficient station operation. The inclusion of RBN and PSK Reporter data enhances situational awareness, allowing operators to assess band openings and signal paths more effectively. DX Finder supports both web and Telnet access, catering to different operational preferences. It also features a dedicated JOTA cluster, specifically designed to support the Jamboree On The Air event.

An email list for the discussion of the Kenwood TS-120 transceiver.

A moxon anetenna plan for 144 MHz

It is a application which can be used for troubleshooting CB radio faults, by giving a graphical display of the normal operating frequencies generated by various parts of the CB radios circuits, it can help you identify if a frequency is incorrect or even missing. Another good use for this software is simulating possible frequency expansions, as it allows you to choose any frequency that the PLL is capable of generating, so you can see what the radio will allow you to get !

N6RK receive 4 square antenna with transformer coupled antennas and true hibrid combiner

World Time and Mapping software including Azimuthal Maps.

Welcome to the farm, where the primary crop is big towers and antennas.

This article will help to unravel some of the mysteries as well as giving useful operating tips to maximize your chances of working that rare station

How to build the Quickie Pneumatic Antenna Launcher

ACOM 1000 modification uses electric band switching, such that both 6m and 4m operation can be maintained.

An unused 5v supply connection allows an electret condenser microphone element to be used in place of the standard dynamic element. Modification by M0UKD

Internet comunity site in Spanish

How to check for propoer connector installation by using a common multimeter to verify conductivity and resistance.

A lightweight inverted vee antenna that can be supported by a 10 metre long fiberglass squid pole. The antenna is designed to cover 10, 15, 20, 40 and 80 m bands.

Collection of modifications for the Heathkit SB-200 RF power amplifier

Engineering Solutions for Unique Problems. Manufacturer of high Voltage, high Current, high Power Power Supply

CB radios and antennas are available online at WeAreCB.com. Everything from police scanners to ham radio antennas in one convenient location.

How to cheaply track ships using AIS and a cheap $20 software radio.

Processing a single RTTY signal from a transceiver's 3-kHz audio, GRITTY employs _Bayesian statistics_ for superior decoding accuracy compared to traditional trial-and-error methods. This approach not only decodes 5-bit Baudot codes but also calculates the probability of error for each bit, enabling features like color-highlighting unreliable characters and smart squelching based on error probability rather than signal amplitude. This allows decoding of very weak signals while suppressing strong, undecodable interference, resulting in minimal garbage text. The program intelligently analyzes decoded text, comparing similar callsigns bit by bit and merging probabilities using the Bayes formula. This often allows GRITTY to determine the correct callsign and place it on the call stack even when all received copies are corrupt. The same methodology is applied to correct errors in exchange numbers and CQ/DE keywords, and to fix incorrect shift states. GRITTY offers an open API interface, documented in its Help file, for integration with other programs, allowing them to receive decoded data and mouse click events.

Announce your callsign at least once every ten minutes. HamTime runs in the corner of the screen and gives you an audible alarm when that announcement is due.

Notes on using the Kenwood TH-D7

San Diego Repeater Association. We maintain oper ham repeaters throughout San Diego and Imperial County, California.

Welcome to scannewbedford.com. This site was built for people who would like to hear a live broadcast of New Bedford Massachusetts public services. There are also a few frequencies from other local towns such as Dartmouth, and Fairhaven being broadcasted on our live audio feed. The web site is free for everyone to use and pass along to another friend. Thank you and enjoy the Scan New Bedford Live Scanner Audio Broadcast of New Bedford`s Police, Fire, and EMS.

A Working analysis of the gamma match problem that gives useful practical results in a article dated April 1969.

A schematic antenna for a 40-80 Morgain dipole antenna with diagram and pictures, article partially in german

An interesting home made project of an L Network Antenna Tuner Project with pictures and schematics by K7SFN

Quick reference guides for yaesu radios

Beautiful Colorado mountain cabin with ham radio access at the foot of Mt. Princeton

Basic information on the folded dipole antenna

Despite the title referencing the callsigns 3C5J and MW0BRO, the content of this resource focuses entirely on the _Cleddau Computer Clinic_, an IT services company operating in Pembrokeshire since 1999. The site outlines a broad range of computer-related services, including custom-built new PCs starting from £399, sales of used systems, and comprehensive repair and upgrade options for existing units. Services extend to anti-virus and spyware removal, system installation, and broadband connection setup. The clinic also provides tuition for hardware and software applications, website design, and video to DVD transfer. They specialize in both fixed and wireless network solutions, enabling clients to share files and broadband connections efficiently. Repairs can be conducted either in their workshop or at the client's home or office, offering flexibility. For situations where on-site repair is not feasible, the Cleddau Computer Clinic offers a temporary replacement computer service. This includes transferring essential data to minimize disruption, a practical approach for local businesses and individuals in areas like Pembroke, Milford Haven, and Haverfordwest.

Knobs, slicers and antique radio parts for heathkit Johnson Kenwood Hallicrafters Hammarlund and many more

RADIOING eEngineer RFI EMI information

General purpose image display and analysis program with special features for analyzing satellite images

Manufacturer of small portable telegraph keys, keyer paddles, and electronic keyer products.

Optimizing DX chasing efforts, this software provides a refined approach to monitoring the DXCluster. It allows operators to configure specific filtering criteria, ensuring that only relevant DX spots are displayed, thereby reducing clutter and focusing attention on desired entities or bands. The application integrates alarm functionalities, notifying the user when a spot matching their predefined parameters appears on the cluster, which is particularly useful for working rare DX or specific band slots. Spot supports both macOS and Windows operating systems, offering a cross-platform solution for a broad user base. Its design emphasizes user control over the displayed information, moving beyond a simple stream of cluster data to an actionable intelligence system for DXers. This client aims to streamline the process of identifying and pursuing DX opportunities. While the software was previously a commercial product, the developer, K3NC, has retired and made registration files for DXBase 2007 available for free, along with a utility to generate registration keys for that specific version. This allows continued use of the DXBase 2007 logging software, though it's important to note the 64-bit OS compatibility modification required for generated registration files.

NetTime is a simple and free software to sync your computer clock via internet. Very useful tool for FT8 FT4 operating modes.

RCKLog is a windows freeware program for logging and administration of SSB and CW-Contest with simultaneous control of transceiver and real-time operation of Packet-Radio.

Information and digital audio samples of various modem modulation types

Big picture and detailed feature of the yaesu VR-5000 receiver

A self-contained and portable SDR Transceiver using a Softrock front end and embedded Digital Signal Processing ... No PC required!

Communications products, communication systems products, fiber optic cables, global messaging service, gyroscope and navigation systems

Choosing a vertical antenna. Buying guide to amateur radio HF vertical antennas by Bencher inc

Radio mods for GE Phoenix radios to use in APRS applications

AA7EE QRP DSB transceiver homebrew project

An old post by John Doty about effects of noise in longwire antenna.

Address and links of many broadcasting stations

A remote control box for the SG-237 that allow to turn on and off, check status the SGC tuner remotely by AA5TB

Meimaris Communication Equipment based in Greece

Cheap Antennas for the AMSAT LEO Kent Britain WA5VJB