|In this page you may find some homebrewing
I hope it will be possible to add other projects, mostly relying on the co-operation of all the interested people.
|Although designed primarily for learning CW, new and experienced CW ops are
sure to like this simple and inexpensive CW decoder.
It makes use of a PIC16F84 microprocessor and a NE567 PLL as analog interface. The software automatically adapts itself to the incoming CW at speeds between 5 and 30 WPM.
It has been published on QST and gained the cover here reproduced.
CW-DECODER (PDF FILE - 47 Kbytes)
PIC16F84 based programmable micro-counter, the ideal complement for your
last QRP transceiver. It may read frequencies over 40 MHz and needs only
15 mA of power supply. It is also possible to connect a prescaler, in a
word.... it should be a pity not to build it
PIC_FREQ (PDF FILE - 60 Kbytes)
CW QRP Transceiver for the 40 meters band. The TX and RX sections are independent modules
and may be built separately. Among the main features are :
5 W output power, Full break-in, superetherodyne receiver, four crystals ladder filter, full coverage of the band with a varicap controlled VFO and SSB reception capability.
QRP 40 m (PDF FILE - 100 Kbytes)
meters CW QRP Transceiver.
Only a little more complex RIG, but you'll find again RX and TX independent modules.
Main features : 5 W output power, Full break-in, superetherodyne receiver with Mosfet RF and mixer stages, four crystals ladder filter, AGC and CW band coverage with a conversion varicap controlled VFO.
QRP 20 m (PDF FILE - 100 Kbytes)
generation' VFO wich makes use of the DDS technology. It is equipped with an AD7008 DDS
from Analog Device and an ST62 microprocessor from Thomson, the frequency and the
tuning step are showed on an LCD display. An ideal gear for your next professional
VFO DDS (PDF FILE - 300 Kbytes)
A "partial synthesis" VFO using the PLL technique, if you want to abandon the classic "free" VFO, but without excessive troubles, this project is for you.
PLL VFO (PDF FILE - 100 Kbytes)
frequency reader you may employ with a classic conversion VFO or to replace the mechanical
tuning in some old RIG
CMOS Reader (PDF FILE - 120 Kbytes)