I use the evaluation version of Circad at http://www.holophase.com/. The owners of Circad are ham radio operators and there is a discount for Amateur Radio Operators who want their product.

To publish a schematic, go to "Print Out", check "BMP to disk", Color Depth - 1-bit B/W, with a Scaling Factor of 100 to 200. The scaling factor will determine how large the schematic will be. The .bmp image is then converted to a one color .gif file. Most image/picture programs will convert .bmp to .gif. If you need help with a conversion program, send me an email.

Manhattan Style Construction - Glued Copper Traces on Printed Circuit Board. Chuck Adams has a Lab Notebook that covers almost all the techniques of homebrewing circuits including Manhattan Style Construction.

A Beginner's Guide to Making CW Contacts

Morse Code has a mystique to it, it is an extremely cool method with which to communicate. In this Beginner's Guide to Making CW Contacts I am going to try and give those hams new to CW a better idea of how to start. How to find someone to talk with, what to talk about, how to deal with QRM, how to end a CW contact, how to get lots and lots of QSL cards, and much more useful and practical information.

The Art and Skill of Radio-Telegraphy

Very good tutorial on how to solder. If you are a beginner, you must go to these sites and learn how to solder correctly.

Neil passed away and his site has been taken down. But I have information and building information on my site. Check out DFD1 information and DFD2 information on this site.

The nearly 11,000 members of QRP ARCI, a non-profit organization, are dedicated to the increasing enjoyment of QRP operation and experimentation, and to the promotion of local and regional QRP Clubs throughout the world.

QRP ARCI publishes the QRP Quarterly, considered by many to be equal in quality to the ARRL organ, QST. Humor, technical articles by the best authors in the ham community, and contest results in a very attractive package.

The NorCal site has kits for sale and a lot of very interesting articles for the QRP crowd.

The North American QRP Club is for builders, experimenters, ham radio operators, and low power enthusiasts.

DataSheet4U is a free electronic engineering tool that enables you to locate product datasheets from hundreds of electronic component manufacturers worldwide.

Amateur Radio and Emergency Communications

Selected History Receiver Inovations Over Last 100 Years Part 1

Selected History Receiver Inovations Over Last 100 Years Part 2

Amateur Radio and Emergency Communications
Disasters in remote places have historically involved amateur radio operators. These “hams” have stepped in to provide assistance when other forms of communication fail. Read more about this on this link. Cool site.

Small-Signal RF Design with Dual-Gate MOSFETs Motorola Semiconductor application note AN-478, prepared by Brent Trout, Applications Engineering. A .pdf file.

Who Really Invented the Transistor at the Bell Labs Memorial website. Did we actually get the transistor from the Roswell alien spacecraft? Very interesting information on early crystal detectors using two cat whiskers and a battery with 3dB gain.

Hans Summers' web site has the most complete collection of "Huff and Puff" frequency stabilizer articles on the internet. Check out his HF Receiver, a polyphase direct conversion receiver. The receiver uses an FST3253 Tayloe switching mixer, a Franklin VFO using a 74HCT04 with a magnetically coupled Huff & Puff stabilizer, and a lossless 8-column polyphase audio network.

AADE Filter Design and Analysis V 4.03 AADE Filter Design is sensibly priced at only FREE. This program will blow the socks off many commercial programs costing hundreds of dollars. This is the last known release of AADE's filter design application for Windows.

Custom Meter Faces - A Pictorial Instruction: An excellent tutorial on using Paint Shop Pro for making custom meter faces. Process can be used with other picture programs.

Plato products is a recognized world leader in the manufacture of high quality, long life replacement soldering tips and desoldering tips. They have tips for the Weller, Ungar, and a whole bunch more.

Class E AM Transmitter Descriptions, Circuits, Etc. - One of the major goals of the class E project is to facilitate the construction, by Amateurs with only a modest background in construction, of a high power, good sounding AM transmitter using modern, readily available components and at a reasonable cost.

The Accukeyer - "...circuit outlined here was updated from a QST article by James Garrett, WB4VVF, published in August 1973, and dubbed the "Accukeyer". K5ESE has done an excellent job of showing how to build this keyer plus updating the chips (HC) and output circuits with MOSFETs. I built mine many years ago with the old 7400 TTL chips and outputs with 300 V MOSFETs. It works fine and will key any rig. Has features that have been lost with the PIC keyers that help send perfect code.
A good copy of the article is here: Good Quality Accu-Keyer article.

An Experimenter’s Project for Incorporating the AD9850 Complete-DDS Device as a Digital LO Function in an Amateur Radio Transceiver, an Analog Devices Data Sheet, AN-557 APPLICATION NOTE

Jim, WA6OTP, has recently released a new PTO VFO kit. Very reasonably priced. I highly recommend any of his kits. Also, check out his other kits and crystal radio book.

"Stable Transistor VFO's", a classic article written by Jim Fisk in Ham Radio Magazine on June 1968. Gives the history of the Seiler and Vackar circuits and a few circuit diagrams that will work even today very well. Uses both PNP and NPN transistors and a lot of very useful information on using both the Seiler and Vackar VFOs.

Phil's Old Radios - Antique radios and memorabilia, with photos and commentary.

Aleksander Stari's, S56AL, web site has a collection of quartz crystal ladder filters and a DDS/PLL based universal synthesizer.

Ham Radio Online's collection of "Online Web Receivers".

Ulrich L. Rohde's, KA2WEM, article in QEX, October 1994 "Designing Low Phase Noise Oscillators" at the ARRL web site. A .pdf file that requires the Acrobat reader.

Ceramic Resonators for Cheap and Cheerful VFOs - This may make crystal VXO's, DDS VFOs, and "Huff and Puff" stabilizers obsolete. Check it out, very interesting.

A Fairchild FST3125 used as high-level mixer

Frequency Counter/VFO Stabilizer

Dale, W4OP's incredible homemade receiver pictures. Very nice.
http://www.parelectronics.com/pics/W7ZOI11%20copy.jpg
http://www.parelectronics.com/pics/w7zoi13jpg.jpg
http://www.parelectronics.com/pics/w7zoi14.jpg
http://www.parelectronics.com/pics/w7zoi15.jpg

Magnetic energy absorber material: Custom RF and Microwave Shields for use as * Mode/Harmonic Suppression * Microwave Absorber * EMI/RFI Shielding * Waveguide Loads * Radar Absorbing Material. Can also be used to find stray oscillations in prototype HF circuits.

RF Design Tutorial Manual from the Philips Semiconductor web site. A 64 page manual. Long download time, 2.29 meg.

Black Cat Books - a British source of old radio, wireless, television, electrical, electronic and other (technical) books and pamphlets with free knowledgeable advice relating to them.

K8IQY's "Manhattan Madness" Project Page A repository for information developed during the design, construction, and testing of ham radio oriented projects.

United States Navy Electricity & Electronics Training Series - NEETS* - This series provides beginners with fundamental electrical and electronic concepts through self-study. The series is designed to give small amounts of information that can be easily digested before advancing further into the more complex material.

Baluns: What They do And How They Do It The definitive balun article.

Receiver and Transceiver Information

AA3SJ says, "...the purpose of these pages is to encourage those who might want to construct the receiver, and to provide information regarding our design." Wes Hayward, W7ZOI, and John Lawson, K5IRK, "A Progressive Communications Receiver," QST, November 1981, Page 11. Original article at ARRL website: A High Performance Communications Receiver

No Excuses 40 Meter QRP Transceiver, Dec 2002 QST, by Dan Metzger, N0KSF takes you through a pictorial on how he built this transceiver which advertises "no special parts required".

The CDG2000 Transceiver A high performance HF transceiver or more correctly a high performance receiver with a fairly standard transmit capability.

A Receiver Evolves:- My New 7MHz Valve Receiver (mainly for AM work), by VK2BA, David Macnaughton

Improved Dynamic-RangeTesting By Doug Smith, KF6DX. You need to search the ARRL article archives.

Information on the HBR Receivers, 12 volt tube regens, R-390A, AC-100 receiver kit and more. Check out the web Site for K5BCQ.

At KD1JV's QRP web site is a 4053 Based 40M Receiver. He also has some kits for the QRP crowd.

K5AM Homebrew transceiver

AA3SJ's "The Wheatstone Bridge Regenerative (WBR) Receiver" web page. And his "Progressive Communication Receiver" page.

Homemade 20M SSB Transceiver and a homebrew encoder for digital VFO knobs.

An amazing list of radio receiver construction projects. "The Ingenious Circuits of Sir Douglas Hall", articles from The Radio Constructor 1962 to 1980 and Radio Bygones 1990 to 1999. Very interesting site.

Low cost AM SWBC Radio The radio can be built for about $15.00. Uses a voltage tuned R/C oscillator, which is part of a 74HC4046 Phase Lock Loop chip.

Presentation of the NC2030 CW-transceiver of Dan Tayloe, N7VE A high performance, low power, image rejecting DC transceiver for either 20 or 30m using the Tayloe product detector. A revised version of his presentation held at the Pacificon 2004.

12V "Space Charged" Tubes Receiver projects using 12 Volt tubes and information on the 12V tubes.

Dynamic Range Data Chart of most of the current commercial receivers. Includes both 20 kHz and 2 kHz spacing.

Magnetic Loop/Long Wire/Dipole Antenna Information

Long Wire and Dipole Antenans for ham radio Featuring 50 links. One of the best link sites for antenna information I have found.

A Magnetic Loop for SWL Reception, A great easy-to-build loop for 2 to 20 MHz SWL reception. A good antenna for the SWL build of the Electroluminescent Receiver Kit. Excellent nice looking web site by KR1ST.

Small Transmitting Loop Antennas

PCB Information

The Largest and Best Collection of CAD Shareware, Freeware and Free Trial Software

10 Top Tips for Working with Printed Circuit Boards

Spice Software, Filter Software and Calculators

G4FGQ's Software - Original, high-quality, radio engineering/modelling programs. Not freeware -- just free gifts -- please help yourself -- no catch. A lot of antenna, matching, and toroid/solenoid coil programs.

B2 Spice v.5 - B² Spice v.5 is the easiest, most user-friendly Spice program on the market. Demo available.

SIMetrix - An enhanced SPICE based mixed signal simulation program with integrated schematic entry and waveform viewer. Available for Windows and Linux platforms. Download Free SIMetrix/SIMPLIS Intro

The Spice Page - SPICE originates from the EECS Department of the University of California at Berkeley. This page provides manual pages, a user guide, and example runs for the Spice3f version of the program.

AppCAD Version 3.0.2 - RF design software that is provided free of charge by Agilent Technologies as a service to the RF and microwave design community.

AIM-Spice - Automatic Integrated Circuit Modeling Spice (AIM-Spice) is a version of SPICE, the most popular analog circuit simulator. AIM-Spice is a new version of SPICE running under the Microsoft Windows and Linux operating systems. AIM-Spice for Windows is capable of displaying graphically the results of a simulation in progress, a feature that allows the operator to terminate a run based on an instant information on intermediate simulation results

SuperSpice - SuperSpice has been specifically designed for use as an analogue/mixed-mode simulation tool by practicing analogue engineers, for analogue engineers. SuperSpice therefore avoids some of the compromises that often occur when schematic captures are designed by software engineers. Trial version available.

JavaScript® Electronic Notebook - consists of a group of JavaScript® driven web pages that are intended for use as a quick reference for Ham Radio operators or just anyone interested in electronics. The Notebook is similar to other applications on the net, like HamCalc by George Murphy, VE3ERP, or a windows version of HamCalc on John Owen's, G4VWL, web site., but no downloading is necessary.

RF Cafe - online calculators and a lot more. Wild site.