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Download this color US ham radio band-plan in PDF format edited by ARRL

Comprehensive listing of all known current HF beacons from IARU Region 1 HF beacon coordinator

py2ohh homebrewing of receivers, transmiters and Test Equipment for ham and swl, using cheap, easy to find or surplus components

FlexRadio Systems delivers the first truly open source Software Defined Radio transceiver for Amateur Radio use. Receive Only versions are also available for non Amateur Radio applications. Read the SDR Articles and the SDR-1000 Product Information.

Scan*Star Spectrum Commander is the software of choice for radio enthusiasts who desire advanced computer control, comprehensive database management features and support for a wide range of radios and decoders.

We often think of the Moxon rectangle as strictly an HF antenna. However, its small size and special far field pattern lend themselves to some VHF applications. So let's see how to adapt the design to 2 meters (as a popular band choice) and also see a few of the uses to which we may effectively put the design.

Building a moxon antenna with aluminium tubes

An inverted U wire antenna for 200 meters and down

The Walnut Tower antenna project

Connect your FT-100 or FT-817 to your pc with this CAT interface cable

Make your own dummy load with two 100-ohm 5W resistors

Dedicated to the collection and preservation of old radios, both tube and transistor.

This shows an unsuccesful attempt to build a push pull 2 m amplifier, with the tubes in grounded screen.

A suitable high gain 70cms antenna for SOTA operation by Richard Price GW0VMW

RufzXP is an excellent free training software for improving code speed and CW practice, particularly (ultra) high speed memory copying of true amateur radio calls.

A free computer aided design program to help users without special expertise in filter design to create filters using Linear Technology's monolithic filter ICs. With FilterCAD, you can design lowpass, highpass, bandpass and notch filters

Live Police Fire Rescue scanner for Jefferson County, New York.

APRSdroid - Android APRS reporting tool

A 3 Element Mono-band Yagi for 20 meters by Kees Wiegers, PA5CW (ex-PA3BHS)

Launch the StarNet radio scanner to listen to Tucson-area police, fire and other agencies radio transmissions.

Interesting project to remotely control, using a servo control circuit, a common commercial antenna tuner by N30X

Two Wire Beverage by Jeff Parke, describes a two-wire Beverage antenna design for improved reception with switchable direction (forward/backward) and lower noise level. It includes details on building the antenna, matching transformers, and a control box for selecting direction and connecting to the receiver.

Repair and sale of icom kenwood and yaesu products

Build the PAC-12 Antenna a multi-band portable vertical designed by KA5DVS, here's an award-winning, easy-to-homebrew, multi-band portable vertical antenna designed by long-time antenna aficionado James Bennett, KA5DVS. He's documented the design and construction plans for a portable antenna

a guide to help install arrays

Offer PC based virtual instrument for electronics enthusiasts, students and professionals, including full-fledged sound card real time Oscilloscope, Spectrum Analyzer and Signal Generator.

Ham radio pictures, qsl and sounds archive by K8CX

This is a combination center and top loaded multiband antenna by Mark D. Lowell, N1LO PDF File

The 80-meter loop antenna, measuring 86 meters (282 feet) of wire, effectively operates across 8 HF bands from 80 through 10 meters, despite its length being a compromise for specific bands. This design prioritizes a "low enough" SWR across multiple bands, aiming for lower SWR values on higher frequencies due to increased feedline losses. A 200-ohm feedpoint impedance provides a workable SWR on every band, with feedpoint impedances ranging from 100 ohms for lower bands to 300 ohms for higher bands. Radiation patterns for the 80-meter loop, mounted at 15 meters high, show a maximum gain of 7.6 dBi at a 90-degree takeoff angle on 80 meters, and up to 12.9 dBi at a 10-degree takeoff angle on 12 meters. This configuration supports regional contacts on 80 meters and provides good DX performance on higher bands. Practical construction notes emphasize using robust supports like trees, ensuring wire slack with _egg insulators_ for wind resilience, and employing an oversized 2 kW 4:1 _balun_ to safely handle higher SWR conditions, even with 100W transceivers. Feedline losses are minimized using _LMR-400_ coax or ladder line, with power transfer efficiency between 80% and 95%. Antenna simulations were performed using _xnec2c_, and the provided NEC file is compatible with other NEC2 derivatives. The antenna is tunable on 6 of 8 bands with an internal ATU and all 8 bands with an external autotuner like the LDG AT-200 Pro.

Pictures of 2.4 Ghz antennas, JN1GKZ S-band homemade antennas

HF multiband mini delta compact and easy assembling antenna that cover from 20 to 10 meters by GM3VLB

This homebrew legal-limit antenna tuner is based on the famous "Ultimate Transmatch" introduced by the late Lew McCoy, W1ICP. The Ultimate Transmatch was described in the "Beginner and Novice" section of the July 1970 QST (Page 24).

Calculates resonant frequency of a loop antenna, correcting for distributed capacitance.

A dual-bander for 80M and 40m. An Extended Double Zepp (EDZ) is a 5/4 wavelength center-fed dipole. This article will introduce the Half-Extended Double Zepp (HEDZ) which has characteristics that a lot of amateur radio operators should find quite interesting

Your source for coax, connectors, wire, baluns, and other certified quality wireman products.

Complete real time signal analysis software with wide range of powerful FFT spectral analysis tools, statistics functions and comprehensive visualization system.

Article with detailed pictures of an endfeed antennna for 20 and 30 meter band

This article describes a 10 watt linear amplifier that is capable of delivering over 15 watts into 50 ohms and uses cheap plastic transistors that are used in CB equipment. by Harry Lythall - SM0VPO

Inductance and Capacitance meter using``Frequency Shifted Oscillator

Now over 10,000 manuals for amateur, audio, and radio-related equipment available

mods collected by mods.dk

A portable antenna for mode B and J satellites

Ham radio dealer based in germany offer RF power amplifiers, from Alpin and SPE, antennas, RFI suppression products and GSM GPRS products

Police, fire, transport, ambulance and many more frequencies

Multitasking data analyzer demodulator and decoder for Windows.

Ham Station description of HB9ABX and CE3CWF, magnetic loop antenna details, Free Energy devices, Pictures from Switzerland and Chile.

U6YRN 6 element yagi antenna for 430-450 Mhz

DIY Basic Electronic Theory, Basic Antenna Theory with Antennas built from common materials. What does SWR really mean. Baluns from transmission line.

SOFT990 is a freeware designed for the transceiver YAESU FT-990. Running also with FT-840 FT-890 FT-900 FT-920 FT1000MP FT-1000D

Manufacturer of self supporting towers. 10 to 200 feet. Residential, commercial, Wi-Fi, safety and communication.