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Delivering confidence to confront the most challenging microwave and RF designs. Spectrum Analyzers by Tektronix

Distributor of test and measurement and calibration instruments and provider of NIST traceable ISO/IEC 17025 accredited calibration services. Texso sells insulated tools, multimeters, insulation testers, and much more.

Stuff about amateur (ham) radio, with emphasis on VHF/UHF, QRP, portable and mountaintop operating.

This project describes a DIY all band HF SDR transceiver. Built around a Softrock 6.3 kit, it boasts a 20W homebrew amplifier and ATmega168 microcontroller for USB control. An LCD displays frequency, power, and SWR. Automatic LPF selection and SWR protection enhance functionality. Compatible with Rocky and PowerSDR software, this project provides a cost-effective and powerful HF SDR transceiver for hobbyists.

DigiSkimmer is a GIT project that permits FT8/FT4/WSPR skimmer base on kiwirecorder/KiwiSDR.

Manufacturer of ferrites

Rugged docking stations and vehicle mounts

Two-way radio communications, amateur radio, cb radio shop based in Madrid Spain

Welcome to our line of Low Frequency, Natural Radio Research, Broadcast, Marine and Shortwave products. Our evolving product line is the result of our dedicated research efforts primarily in the areas of LF, VLF, MF, and HF.

Interface board was for connecting Yaesu FT-817ND transceiver to Android phone or tablet. The board was developed for experimenting with RTTY, SSTV and other digital modes using DroidRTTY, DroidSSTV and other software on an Android phone.

Dedicated to the history of radio broadcasting.

Article about tropospheric propagation and the way in which radio signals at VHF and above propagate over greater distances than strictly line of sight in the troposphere

This is a antenna tuner with wide range tuning for antennas with a Z of + 50 Ohms on all the HF bands.

Presents the official results for the _CQ World Wide 160-Meter Contest_, a premier event for Top Band enthusiasts. The resource details final scores for both CW and SSB segments, offering links to comprehensive articles, plaque winner lists, and club score breakdowns. It also includes access to score databases for individual modes and years, along with "Soapbox/QRM Comments" from participants, providing insights into operating conditions and experiences. This archive spans results from 2010 through 2025, with a forward-looking note regarding the 2026 SSB contest date adjustment due to a conflict with the _ARRL DX CW Contest_. The site provides specific links for each year, allowing operators to review detailed outcomes, including top scores, errata, and all-time records, such as the _SX5R_ 2017 SSB performance. The structured presentation facilitates easy navigation through historical contest data.

Laboratory 599 makers of the DISCOVERY HF/50 MHz SDR Ultra-compact Trasceiver.

The first DX From "The Southern Most Tip Of Mainland Asia"

Amelia Island, IOTA NA-138, Saturday 31 December 2005 until Monday 2 January 2006 Jekyll Island, IOTA NA-058, Tuesday 3 January 2005 until Saturday 7 January 2006

Manufacture and design high-quality and cost-effective VHF and UHF radio modules that cater for the wireless needs of OEMs worldwide

DataBridge wireless RF modem modules facilitate point-to-point data transmission, supporting analog, digital, and serial RS232 UART signals. These modules are engineered for robust wireless communication, offering a reliable solution for various industrial and amateur radio applications requiring secure data links. The product line includes specific models designed for different frequency ranges and power outputs, ensuring compatibility with diverse operational requirements. Each module integrates advanced RF technology to maintain signal integrity over distance, crucial for remote monitoring and control systems. The design emphasizes ease of integration, allowing users to quickly deploy wireless data links without extensive configuration. Key features encompass low power consumption and a compact form factor, making them suitable for embedded systems and portable devices.

Zplots is an Excel application that allows you to plot impedance and related data obtained from a variety of sources. You can plot on both an XY chart and a Smith chart as well as view the data in tabular format. The XY chart can be customized with your choice of trace lines. Frequency (in MHz) is always shown on the X axis.

Drake R-4 Receiver manual

If you thought you knew everything about balun performance characteristics, there is an important figure of merit you may have neglected

Amateur radio accessories, like the CT-17B ICOM CI-V hubs, IABs ICOM ACC1 Breakout boxes, GS232Dunio GS232A/B arduino based rotor controler, IMK memory keypad for ICOM Radios

An homemade 50 Ohm 140 W dummy load based on an idea and project by ON5DB Renaud.

Togo DXpedition 5V7TT 10th-23rd October 2010

The TX & RX DX Group is a group that was created inside the TX & RX Forum. Several colleagues reported in TX & RX Forum were participating in a thread about the DX on 11 meters and so it happened

These pages containing informations about contesting on 144MHz and higher bands. All informations are only in Czech language.

Ham amateur radio club experimenters repeater vhf contest indianapolis, carmel indiana, irlp ice D-Star

Sound clips and notes on sporadic E on four meter band

9M0L 9M0 Spratly Is Layang-Layang DX Pedition 10-24 April 2012

This module is an analogue and digital SWR and power meter/monitor, designed to replace analogue SWR and power metering in an AM Transmitter project.

The Michigan Radio Amateur Youth Network (MRAYN) aims to centralize resources for young operators across Michigan, fostering engagement in amateur radio. This initiative brings together various youth-related clubs and activities, providing a dedicated platform for information exchange and participation. The network supports educational efforts and promotes the hobby among younger generations, ensuring continuity and growth within the amateur radio community. Corey Bulock, KD8BOQ, is listed as a key contact for MRAYN, indicating active leadership in coordinating these youth-centric endeavors. The network's focus includes organizing events and sharing relevant content to keep young hams informed and active. By consolidating information, MRAYN simplifies access to opportunities for youth interested in two-way radio communication, from basic licensing to advanced operating techniques.

PI4COM is a small group of enthusiastic radio amateurs who like HF contesting

Programming the FT-8800R via the front panel and microphone keypad is not extremely difficult. Already having a list of local repeaters in CHIRP, the addition of a USB cable would allow you to coordinate the memory layout across multiple radios with ease.

Transverter for 13 cm 23 cmd and 33 cmd band. 23 cm RF power amplifier, RF power amplifier for 2.4 GHz for the QO-100 satellite. Popular for the 1296 MHz transverter

Article on operating aids and band usage during solar minimun periods. Author tries to explain what can we expect on the HF bands during a solar minimum period and which approach to be used to understand band openings.

Realtime online log search for 5X3C DXpedition to Uganda 2019

The Windom antenna, one of the oldest antennas developed for amateur use, has had a complicated history, one as interesting as the theory of the antenna itself.

This EXCEL Program Worksheet calculates the safe operating conditons for a toroidal transformer operating between 1 and 50 MHz. Manufacturer data for complex permeability, magnetic dimensions, and saturation flux density must be available. Some core types which are commonly used in amateur transmission are included. The program produces limiting winding voltages for linear operation and temperature rise over the range of frequencies and power specified.

A portable operation experience with a SpiderBeam pole during a contest, testing wire antennas, like dipole and delta loops configurations on 20 40 and 80 meters band.

VHF/UHF FM Mobile Transceiver with APRS and EchoLink Functionality official Kenwood UK site

The ARI Tuscany Regional Committee sponsor a special Award during the 2013 UCI Road World Championships held in Tuscany from 22nd to 29th September 2013

A page devoted to my amateur radio station: KQ4Y

Antuino is an accurate instrument that can be used in the field to measure SWR, field strength, modulation, etc. In the lab, it can be used to sweep filters, measure gain, distortion, frequency response, etc. It works upto 150 Mhz. On the third harmonic, it is usable on 435 Mhz band as well (with reduced sensitivity).

East river amateur radio club - Bluefield, WV

Contesting Resources for Amateur Radio - A long list of amateur radio contesting resources collected by K8ZT

Longwave refers to all frequencies below the lower end of the AM broadcasting band at 540 kHz

Ulaanbaatar DX Club facebook fan page

AN-SOF is a professional comprehensive software tool for the modeling and simulation of antenna systems. AS-SOF allows to describe antenna geometry, Choose construction materials, Describe the environment and ground conditions, Describe the antenna height above ground, Analize radiation pattern and front-to-back ratio, Plot directivity and gain, Analize input impedance and VSWR,Predict antenna bandwidth