Search results

Mac the Scope is a professional quality signal analyzer, 1/3 octave RTA, signal generator, and more.

Review of the Kenwood TS 830

A general article on CMC, common mode choke include a description and tipical usage.

This page list schedules for the E10 Spy Number shortwave radio station, commonly believed to be run by mossad.

With the view to establish a quick and easy multi-band antenna deployment for portable and camping operations a simple long wire antenna with an earth or earth plus counterpoise arrangement with a 9:1 voltage unun including a tuner or simply with a tuner is one possible solution. With the 9:1 voltage unun and wire lengths suggested in the below tables the antenna should present non extreme impedances for all HF amateur band frequencies. This page is far from complete and represents the ongoing investigation into this type of antenna. Experiments to date seem to have raised more questions than obvious answers.

G4ILO compares popular antennas for 2 metre band handhelds so as to see how much you lose using a small inconspicuous antenna or how much you gain by using a long antenna.

If you want to build a cw decoder without using other active components than an atmel 328 - Arduino UNO , then this is sure something for you.

KE7FTE, N7QQU and W9ERT show us the "drag and drop" flexibility of the Icom D-STAR System.

Find out how much to adjust the length of a quarter wave whip or a half wave dipole rather than the outright cut-and-try method.

The broad band hexagonal beam (hexbeam) designed by G3TXQ and built by K4KIO

Small antenna, what causes loss and how to increase radiation resistance in small antennas., A description of loss and radiation resistance.

This circuit enables fair copy of strong 444 MHz signals, off a local repeater, using a 2m rig and a 1/4λ 70 cm indoor ground plane antenna.

5M2TT Log Search Liberia 2011 dx pedition

Bencher Tech Notes: Selecting your next yagi

EB5AGV / EC5AAU Boatanchor collection. Useful data on TV-testers, Collins, Drake, Hammarlund, Hallicrafters, National, Heathkit, EF Johnson.

Recordings of RF noise from personal computers, peripherals and related equipment. If you can match noise at your location to one of these files then you can be confident that you know where your noise is coming from.

An ARRL Special Service Club located in Northeast Nevada. Operates one of the largest linked repeater systems in the State of Nevada.

Antennas for Broadcasters, PSI manufactures a complete range of slot antennas for UHF television broadcasting

Compiles a detailed calendar of RTTY contests, providing essential information for digital mode enthusiasts. It lists contest dates, links to official rules, and often includes historical results and records, enabling operators to plan their contesting schedule and review past performances. The resource covers a wide array of RTTY events, from major international contests like the _ARRL RTTY Roundup_ and _CQ WW RTTY_ to smaller, regional competitions. Operators can quickly identify upcoming RTTY contests, review specific rules for each event, and access historical data to gauge competition levels. For example, the site details the _BARTG RTTY Sprint_ and the _SARTG New Years_ contest, offering a centralized hub for RTTY contesting information. This resource is particularly useful for those aiming to improve their digital contesting skills or track their progress against established **records**.

Theory of the ferrite rod antenna

Morse code trumps SMS in head-to-head speed texting combat

Some Notes on the Slim Jim Antenna by Dave Coomber M0UXB

Errante's virtual ground Balun, a state-of-the-art high power HF balun family.

Florida Alfa Tango d'Alsace.

Listen to Missouri State Highway Patrol live scanner

A personal review about the Yaesu FT-817

Noise eliminating products. Remove unwanted background noise and interference leaving only the speech. Clear communications, listen stress free. Dsp noise cancellation solutions.

Iphone App with list of nearby repeaters in the UK, along with details of input and output frequencies, a map, and a handy bearing arrow for each repeater.

Printable Quick Reference Card for Yaesu VX-7R

This project describes how one USB port can provide all of the signals necessary to operate a transceiver in digital mode from a Windows XP laptop by KG4JJH

For owners or potential owners of the Icom IC-V85 Handheld Transceiver.

Antennas for asset tracking, navigation and remote monitoring GPS, GSM, GPS/GSM, Satellite Radio, WLAN

Accurate frequency measurement is crucial for amateur radio operators, particularly when building or troubleshooting transceivers and test equipment. This resource details the construction of a _PIC microcontroller_-based frequency counter, providing a practical solution for precise frequency display. The design incorporates an LCD readout, offering clear visual feedback of measured frequencies. The counter can operate as a standalone unit, useful for general bench testing, or be integrated directly into a receiver. Its built-in offset functionality allows for seamless integration, enabling the display of the received signal frequency rather than the intermediate frequency. The project focuses on accessible components and construction techniques, making it suitable for homebrew enthusiasts. Key features include a measurement range up to **50 MHz** and a compact form factor.

MacOSX real-time precision signal / waveform generator. Uses native Mac sound Out capabilities.

a website by vu2fd with theory lessons, details on rules and regulations and planty of homebrew projects for radio amateurs, java calculators.

How to build a QFH (Quadrifilar Helix Antenna) to download images from weather satellites. A complete tutorial on assembling QFH antenna at home with simple and common tools

This is not a sophisticated automatic keyer but it is lot QRP to build and to have fun operatin

Mitigating RF noise in a mobile operating environment, particularly within a _Jeep TJ_ vehicle, presents unique challenges due to the vehicle's electrical system and chassis characteristics. This resource details practical methods for identifying and suppressing various forms of radio frequency interference (RFI) that can degrade receiver performance for both CB and amateur radio transceivers. It covers common noise sources such as ignition systems, alternators, fuel pumps, and computer modules, explaining how these components generate broadband or specific frequency noise that impacts radio communications. The guide offers actionable solutions, including proper grounding techniques, the strategic use of ferrite beads and toroids on power and data lines, and the installation of bypass capacitors. It discusses the effectiveness of different filtering strategies for DC power lines and antenna feedlines, illustrating how a clean power supply and shielded cabling can significantly reduce conducted and radiated noise. The information presented helps operators achieve a lower noise floor, improving signal-to-noise ratio and enabling clearer reception of weak signals, which is crucial for effective mobile DXing or local ragchewing.

Features, functions, a howto and opinions by Jason Buchanan - N1SU

Fixing the IC-7000 noisy audio that can occur when IC-7000 audio output is connected to Hi-Fi earphones or external speaker.

The Premier MidWest DX Convention, Illinois.

The AB2RA bowtie 80 meter antenna includes also a 40 meter dipole

HSCW/WSJT meteorscatter/path simulator a first attempt at trying to model meteorscatter events and simulate their transmission characteristics

The resource details the construction of a multiband trap-style Inverted-V antenna designed for operation on 3.5 MHz, 7 MHz, 14 MHz, 21 MHz, and 28 MHz. It presents specific winding data for the traps, including the number of turns, wire gauge, and coil former dimensions, crucial for achieving resonance on the target bands. The document provides a parts list and a diagram illustrating the antenna's physical layout and trap placement. It outlines the process for building the traps using PVC pipe formers and specifies the required capacitor values for each trap. The design emphasizes a practical approach to achieving multiband operation with a single feedline, a common goal for HF operators with limited space. The document includes a table with antenna segment lengths for each band, allowing for precise replication of the design. It also offers insights into tuning and adjustment, ensuring the antenna performs optimally across the designated amateur radio bands.

Lithium Lead NiMH NiCad Ion batteries

A home made 4:1 Ferrite QRO Bal-un with a FB 241-61 Type K

Hose Company 1 East Rockaway Fire Department Official Page. Scanning FDNY & East Rockaway Fire

Guide to soldering an desoldering

Yaesu transceiver vx-170 water proof test

A family of small size QRP SSB transceivers for the 15 MHz. Includes a cigarette pocket size QRP transceiver and a larger shirt-pocket transceiver.