© 2006 QRP2004 Design Team

Welcome to the QRP2004 web site

Introduction

The QRP2004 is a major new multi-band HF Transceiver designed by G0BBL, G8BTR and M0PUB. The article was first submitted to the Radio Society of Great Britain (RSGB) in October 2005, passed technical review in May 2006 and was due to be published in "Radcom" magazine starting in October 2006. However, many months later we are still waiting, so we have elected to publish full details on the internet instead.

To keep this site as simple as possible, the full article transcript is available as a single PDF file by clicking here. In order to read this information you will need to have Adobe (r) Acrobat (r) reader installed on your computer. This can be downloaded for personal use from the Adobe web site at http://www.adobe.com/products/acrobat/

Please note that the article runs to 52 pages, and is about 6MB in size, so it may take a while to download and display!

If you are interested in building a QRP2004, or just want to build some sub-systems for use in other homebrew projects, you will need a couple of things which are not in the main article. The most important items are:
1. the PCB copper pattern diagrams, to allow constructors to create their own PCBs,
2. the associated component overlay diagrams, and
3. the firmware for the control board.

All of these items can be downloaded by following the links below. Over time, we envisage that additional construction notes, hints and pictures will be added to this site to assist QRP2004 constructors.


PCB Copper Patterns

When you display these images in your browser they will appear small, with a lot of surrounding white space. This is because they have been created in A4 size, but with the copper track patterns in the correct size for etching. Save the required file(s) on your computer and print to an A4 sheet to obtain the track pattern in the right size.

Depending on what software you use for printing, you may need to set the page margins to zero. We suggest that you try a test print on a sheet of paper and check that you are printing at the right scale. (Most of the boards include DIL ICs, so for these it is easy to check that the pads are printed accurately at 0.1" pitch.)

Control board

VCO board

PLL board

Mixer board

Audio board

Band Pass Filter board

PA board

Low Pass Filter board


Component Overlay Diagrams

Like the copper track patterns, some of these images will appear quite small in your browser, with surrounding white space. The difference is that these diagrams are TWICE actual size to make them easier to read. Save the required file(s) on your computer and print to an A4 sheet to see the overlay at twice actual size.

Control board

VCO board

PLL board

Mixer board

Audio board

Band Pass Filter board

PA board

Low Pass Filter board


Control Board Firmware

The QRP2004 uses a microcontroller-based control board which offers a reasonable selection of features without getting carried away with 'bells and whistles'. The firmware has been pretty static for several months now, but there may be one or two further releases in future in response to requests for particular enhancements.

The firmware is supplied here in hex file format, ready for programming into the PIC16F877A microcontroller on the control board. There are numerous programming tools available which support the PIC16F877A, and some suggestions are given in our Radcom article. The firmware is available to download by clicking here. Depending on which programming tool(s) you use, you may need to rename the file from QRP2004.TXT to QRP2004.HEX - our web site hosts will not accept files with an extension of '.HEX'.

If you just want to use the firmware as we have designed it, then the hex file is all you need. However, if you have some experience of developing PIC software in assembly language, and would like to either modify the firmware, or just take a look at how it works, then you will want a copy of the source code. In this case, please contact M0PUB directly - see below.


Policy for this site and its contents

This site is copyright of the QRP2004 team: G0BBL, G8BTR and M0PUB, except where otherwise stated


Site Philosophy

We have designed this site in a true QRP minimalist style and tried to make it very simple and to the point. As many of you will not be using the latest hardware we have avoided flashy graphics, bells and whistles and put content before form. It should work with all web browsers and be pretty quick to load even over slow links and on QRP computers.


Contact details

You can email Alan, M0PUB at:

or Jan, G0BBL at: