© 1999 QRP2000 Design Team

The QRP2000 Project Home Page

Written by Steve Farthing G0XAR

© 1999 QRP2000 Design Team

Latest Update on Project
December 4th 1999

QRP2000 update

There was considerable interest after the publication of the QRP2000 project on the WEB and our presentation at the FDIM QRP convention at Dayton in May 1999, however this interest was not sufficient to justify designing and making PCB's available for the Synthesizer or PIC Control board. The QRP2000 prototype was scratch-built and we expected that a QRP kit supplier would be interested in having the PCB's done. What has become apparent to us is how small the QRP market is. QRP suppliers can only provide this type of commitment if the design would be marketed as a "foolproof" kit, which then needs to be published in one of the major US, UK or German Ham Radio Magazines. We did not have the time for this. Also the use of two AD9850 synthesizer chips in the QRP2000 was making the cost of any kit very expensive now this chips is on allocation and the UK price for small quantities has doubled to £35.- each. The AD9851 can be used instead with some minor modifications to the original circuit and is cheaper. We will continue to provide support the QRP2000 with advice where possible.

QRP2000 Circuit Corrections

Following errors are in the QRP2000 DDS Control board circuit diagram:

1) LCD1 Pin 5 R/W should be connected direct to ground. Delete R12.

2) LCD1 Pin 2 should be connected to +5V Top of adjustment potentiometer R13

3) LCD1 Pin 3 should be connected to tap of adjustment potentiometer R13

4) R7, connected to Pin 3 (A4) of PIC to +5V is 2K2

QRP2000 firmware

Programmed PIC 16F84 chips for the QRP2000 will continue to be available from me at cost for the QRP2000 for those who cannot program their own PIC's. Cost including postage is: UK £4.- US $10.- Holland Dfl 15.00



The QRP2001…… An experimental Direct conversion receiver …..

We started off designing the Quadrature Synthesizer to make the KK7B direct conversion boards usable on all the HF bands. The KK7B provides excellent audio, but we wanted to move forward and built an even better direct conversion receiver, one which would be as good and friendly to use as any of the modern super-hetrodyne black boxes…..

I found that the KK7B really needed an RF stage for 20 meters to improve sensitivity and increase the overall gain for confortable "arm chair" listening. I like listening in to the various technical ham net-discussions whilst busy with all aspects of homebrewing and therefore really some form of Automatic Gain control is a must. Thus the QRP2001 was started, using new developments like the N7VE Product detector in combination with the Polyphase 90 degree phase shifting network which promises good unwanted sideband suppression and uses standard off the shelf component values.

The result are two brief articles that are being published, one is in December 1999 edition of the Dutch Benelux QRP Nieuwsletter and a version of the same article in English will be featured in issue 101 of Sprat, published by the G-QRP club, and is due out just before the Millennium…. Hope you enjoy the read. Once published the article will also be available on this Web-site including the firmware for the QRP2001 PIC Chip (only one AD9850 now required….) Again a programmed chip is available from me at cost as before.



Merry Christmas and a Happy New Year to you all.

Best 72's/73's and keep on soldering…..



Jan, G0BBL, Steve, G0XAR and Alan, G7PUB



Programmed PIC chips: Jan Verduyn G0BBL, 14 Ragleth Grove, Trowbridge, Wilts, BA14-7LE, England

Summary

The QRP2000 is a high performance multi band HF transceiver for the home constructor. It is based on :

At the moment we have a working Receiver. The transmit side is under development. Eventually this site will contain everything you will need to know to build your own version of the QRP2000.

Policy for this site and its contents

This site contains pre-release documentation and is the copyright of the QRP2000 team, that is G0XAR, G7PUB and G0BBL, except where otherwise stated. We have taken a lot of care to make the contents as accurate as possible however it may contain mistakes. It has been made available to you in the spirit of Ham Radio and must not be published elsewhere without the prior permission of the QRP2000 team. We have no objection to you building on our work and making use of it in your own individual projects. We will, however, take a dim view of anyone attempting to steal the results of our efforts. This is not a profit making venture however we have had support from MPC Data and Hands Electronics so please do not rip them, or us, off.

Dayton 99

Jan and I will be giving a presentation at FDIM 99 on the project and will have a working prototype receiver for you to play with.

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. If you have any comments on the content or suggestions for improvements please EMail me..


Site Index

          Introduction & Specification

Thank you for your interest,
Best 72's

Steve, Alan & Jan