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

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

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.

Official ICOM distributor for The Netherlands, Belgium and Luxembourg

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.

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

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.

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

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

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.

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.

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

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

IC 706 modifications collected by mods.dk

Dual band rectangular loop antenna for 15m and 10m

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.

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

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 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.

N6RK receive only loop antenna

Butterfly capacitors are hard to find, expensive but they can be home made by PY1AHD

An introduction to DIY building of a concrete base for a 45' mast.

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.

Get the most out of the shortwave listening hobby. Follow these steps to get started with your new radio.

FT-450 Operation Manual

DTMF, RF, decoders receivers and accessories icluding computer interface boards, frequency counters, tone decoders, spectrum sweeper and nearfield receivers

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.

This PDF document, authored by KT4QW in October 2004, details the construction and modeling of a dual-band, horizontally polarized hanging rectangular loop antenna for **10 and 17 meters**. The design, adapted from *The ARRL Handbook*, utilizes _NEC4WIN95_ software for scaling and optimization, targeting a 50 ohm feedpoint impedance. The resource includes a bill of materials, step-by-step construction instructions, and a discussion of the antenna's radiation characteristics. It presents NEC-generated elevation and azimuth patterns, comparing the loop's performance to a half-wave horizontal dipole at the same height and frequency. The 17-meter element is centered at 18.140 MHz for low SWR across the phone band, while the 10-meter element is centered at 28.500 MHz. Construction involves 14-gauge stranded copper wire and Schedule 40 PVC spreaders, with the total wire length calculated by the formula: Length in feet = 1005/MHz. The feedpoint impedance can be adjusted by modifying the rectangular aspect ratio. The document specifies hoisting the antenna to at least a half-wave above ground for testing. It notes that a balun was tested and found to have no measurable effect on SWR or radiation characteristics. A 2-meter scale model is presented to illustrate the physical design, and a "rotator" string is incorporated for directional adjustment up to 90 degrees.

SD sets the standard for fast, simple logging and editing in the major international contests and in dozens of others worldwide. SD by EI5DI is a free HF contest logger for windows.

Point to Point hf ionospheric communications analysis and prediction program

Morse Code ultra lite touch paddles and keyer, Touch Paddle plus built-in electronic keyer

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

Large picture of Icom IC-718 by Rigpix database

Yagis for 20 15 10 meters band by Nathan A. Miller

A list of all IOTA reference numbers and IOTA groups for the Islands On The Air award, personalised to your own QTH

Interesting review about active magnetic loop antenna Wellbrook ALA 1530 and 330S by ON4SKY

Sangean is the leading manufacturer of short wave and pocket radios around the world. Built with precision, quality and the highest technology

Simple, inexpensive and easy to erect, this antenna provides directivity, low angle radiation and a small gain on a number of HF bands.

Sundance SDR, TI software defined radio solution

Modifications for Icom IC-2100H by mods.dk

The Voice Keyer is a free Windows based voice keyer. It is very easy to use and it handles up to seven messages. By connecting your computer soundcard to your radio it's possible to just press a button and the computer will CQ for you, to spare your voice. It can also PTT your radio via the LPT port by SM3WMV

The Answer To Suburban DXing On the Low Bands - by Merv Schweigert, K9FD

Well documented Amateur Radio HF/VHF antenna projects, high power Russian GS35B RF amplifiers, mobile RFI solutions, related accessories, vintage radios, Six meter equipment, and useful techniques by K8CU are inside.

The EF0604S is a compact 4 elements yagi antenna plan for six meters band featuring 8.77 dBi gain and a front back gain of 17.89 dB. Article includes elements dimensions and spacing, along to pictures of some homebrewed examples.

Pictures of the Ameritron AL-811 modification for 10 meter band extension by km5ps

A gallery collection of funny qsl cards received by PE2PE