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Students interested in HAM activities at Indian Institute of Technology, Bombay.

SDR software for SDRPlay RSP1, RSP1A, RSP2, RSP2PRO. SDRuno is an advanced Software Defined Radio Application platform which is optimized for use with SDRplay's range of Radio Spectrum Processors

Blog site for various home brew projects including antennas, power dividers etc

Manufactures automatic mixers, analog and DSP signal processors, room combining and matrix mixers, and audio test equipment for just about any customer application.

RF / IF Microwave components DC to 20 GHz

manufacture and distribute specialty low temperature solder pastes, butane powered torches, tools and a few other amazing products

DXpeditioning since 1993, February/March 2006 - Saint Martin & St. Maarten FS and PJ7, October 2005 - South Africa ZS1/DL7DF, April 2005 - Ghana 9G5SP, Feb/Mar 2005 - British Virgin Islands VP2V/DL7DF, October 2004 - Cameroon TJ3SP, February 2004 - Kenia 5Z4HW , October 2003 - Myanmar XZ7A, March/April 2003 - Tobago 9Y4/DL7DF, Oct/Nov 2002 - Guinea 3XY7C

DXWatch provide live spots for FT5GA Glorioso dxpedition 2009

Yahoo Group dedicated to the Amateur Radio Community, not the Commercial Sector.

An operating guide for the com IC-2720H VHF/UHF Radio, includes Turning the power On or Off, Selecting the Output Power, Activating Memory Mode, Operating in Memory Mode

Info on 2013 Icom recall for IC-7100 for touchscreen replacement and N-Connector substitution with SO-239 by PD0AC

Radios 4 you inc. where quality radios and other electronic products are blended with fair prices to produce excellent value for you. radios specializes in shortwave radios, solar rechargeable radios, am radios, and fm radios for sale.

Wide selection of quality, affordable shipping cases including stock and custom, heavy duty, pelican protector, removable top, wheeled, ATA, and more!

The CQ World Wide DX Contest records document top scores, with the Multi-Multi SSB category showing CN8WW achieving **78,170,508 points** in 2000. These records span from 1948 to 2025, categorizing results by region, operating class (e.g., Single Operator High Power, Low Power, QRP, Assisted), and specific bands like 10M, 15M, 20M, 40M, 80M, and 160M. For instance, EF8R (E77DX) holds the All-Band High Power SSB record with **25,747,775 points** in 2025. Each entry includes the callsign (with operator callsign in parentheses for guest ops), year of operation, and total score. The _CQ WW DX Contest_ also features records for the RTTY and VHF contests, alongside the main SSB and CW categories. QRP records demonstrate significant achievements, such as P40W (W2GD) with 5,097,780 points in the All-Band SSB QRP category in 2000. Multi-Two and Multi-Single categories are also detailed, providing a comprehensive overview of competitive performance.

A multiband Fan Dipole that works on 40 20 15 meters band, making a folded dipole for 7 MHz band and additional element for the 21 MHz and 14 MHz

APRS4R Digipeater configuration notes by K6DBG

Android Echolink client to connect to the echo link network

Electronic and RF components for the hobbyist

High performance Software and Devices

J49I operated from Crete Island (EU-015, KM25PH) during the 2008 _CQ WW DX CW Contest_, focusing on multi-operator category participation. The station's activity centered on maximizing contacts and multiplier acquisition across various HF bands during the competitive event. Operators aimed to achieve a high score by leveraging the island's DXCC entity status. The team, comprising Greek and Italian amateur radio operators, utilized the J49I callsign for this specific contest operation. Their efforts contributed to the overall contest results for the 2008 CW segment, with logs submitted reflecting their performance from the European continent.

This is the website for K3LP, well known DXer and DX-peditioner. Look for Dave during the main four Contests (ARRL DX CW/SSB and CQWW SSB/CW)

A nice article expleraing why during the sunset it's possible to listen to long distance radio broadcasting stations.

13cms and 23cms ATV my projects and builds. Also using wifi amps on 13cms, 13cms dish feeds using a Sky dish. GB3CZ

Official kenwood document explaining proper procedure to upgrade firmware on a Kenwood TS-590S

Converting the Jabra A210 Bluetooth Interface for Ham Radio

Low Country Amateur Radio Club Summerville, South Carolina 147.060+ / 147.030

An interesting article on pedestrian portable HF DXing

The "Shortish Guide to Using an Oscilloscope" elucidates the fundamental operation of oscilloscopes, detailing the purpose and function of vertical, horizontal, and triggering controls. It explains how vertical gain in Volts/cm and horizontal scale in sec/cm enable measurement of signal amplitude and timing, respectively. The resource differentiates between analog and digital scopes, noting that digital scopes often feature "soft" controls and are inherently storage scopes capable of capturing non-repetitive events. The guide dedicates a significant section to the critical role of oscilloscope probes, emphasizing their design to transmit waveforms without distortion or added noise. It explains the concept of a 10x passive scope probe, which reduces circuit loading by a factor of ten and eliminates waveform distortion through probe compensation, typically adjusted using a 1kHz square wave reference output. The document also provides practical advice on probe care and compensation procedures. Further sections address grounding considerations, explaining how a scope measures voltage relative to its chassis ground, which is tied to the protective earth. It offers troubleshooting steps for a blank screen and outlines essential good practices, such as checking input gain and probe attenuation, while explicitly warning against misusing probes or connecting the ground clip to mains voltage.

The Radio Amateur Megacycle Society

In this article, K8CU describes his custom design that uses an embedded controller and touch screen LCD panel.

This article is about a home made project of a whip antenna for 2 meters band. Includes lenght of whip for all frequencies from 140 MHz to 151 MHz both in mm and inches

News/Projects for Amateur Radio

A quad turnstile consists of two cubical quad loops oriented in a diamond configuration and angled 90 degrees apart from one another with both diamonds sharing the same top and bottom points

A 144 to 148 MHz J-pole antenna, optimized for base station use, is presented with detailed construction plans. This slim, omnidirectional, half-wave antenna is fed at the end through a quarter-wave shorted transmission line, drawing inspiration from the classic _Zepp antenna_. The design emphasizes achieving a 1:1 VSWR and good efficiency on the 2m band, noting that even a one-percent error in calculation can significantly impact performance. The article provides specific dimensions in inches for the radiator, quarter-wave section, and feed point, along with a parts list for construction from inexpensive materials, estimated at approximately **$10** total cost. The resource offers practical construction tips covering copper pipe selection, L and T joint variations, and detailed soldering instructions using a propane torch. It addresses feedline attachment, the critical role of a four-turn, _5-inch diameter_ choke to prevent coax radiation, and proper antenna fastening techniques, including grounding for lightning protection. The author explicitly advises against scaling the design for other bands due to potential efficiency loss and offers guidance on corrosion protection. The antenna design has been released into the public domain for private amateur use.

PS8RF beacon tx in 7.035 Mhz with 3 W

Multi-op contest station of Joe Rudi, NK7U of Baker City, Oregon, USA

Review of the X1M HF QRP trasceiver by VE3FAL

Dealer of ECG Consumer and MTE electronic components

International supplier of radio astronomy products

An homebew microphone boom by W2DTC

This EXCEL Program Worksheet calculates the common-mode impedance of a 1:1 Guanella (current) balun which is placed at the feed point of a balanced antenna system fed via coax.

Helps you study for the Ham Radio & FCC GROL exams. Often times, test questions are worded in ways; that fool you. RadioTelephone Tutor drills on missed questions, till you know the answers backwards and forwards. Can take entire question pools in straight, or random order. Creates a practice test; which represents what you would be given in a real exam.

The SARK-110 is a completely new design concept for an Antenna Analyzer. This is a truly pocket size device, so you can take it anywhere. It offers a gorgeous 3" high-resolution, active-matrix color display that allows information-rich diagrams, works from 0.1 to 230MHz

Have wondered why a Smith chart has such strange grid lines. Believe it or not, there is a logical progression from Speedometers to Smith charts that will make the Smith grid crystal clear.

On March 27, 2017, the FCC adopted final rules for the USA 630-meter band, detailed in Report and Order FCC 17-33, which required PLC coordination with the Utilities Telecom Council before amateur operations could commence. This resource documents the WD2XSH experimental group's activities, including authorized stations, band plans, and frequency assignments within the 465-515 KHz range, with many stations operating between 495-499 KHz and 501-510 KHz. The site also highlights the WRC-12 decision on February 14, 2012, which granted a new **7-kilohertz-wide** secondary allocation between _472-479 kHz_ for the Amateur Radio Service worldwide. The group's efforts included operating with a maximum ERP of **20 Watts** across 45 stations in the continental USA, Alaska, and Hawaii, using emission modes such as CW, PSK-31, FSK-31, and MSK-31. The site provides links to download FCC 17-33 in PDF and DOCx formats, and offers a station location map, a list of stations by callsign and frequency, and an archive of news updates. Reception reports for any 600-meter station are encouraged to help the amateur radio community understand propagation and repeatability on this challenging band.

Modifications to an Ameritron ALS 600 power amplifier by AF6SA

One of the classic arguments in amateur radio is whether a dipole or vertical is the best antenna

Electrical and electronics online calculators by Calculatoredge.com

TM-241E Picture and specifications