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WELCOME TO THE HOME PAGE OF
PY2WM (ex-PY2FCE) JK De Marco |
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OLD PRINTED
ARTICLES: QRP and simple CAD software 5/june/2008
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SIMPLE POWER SUPPLY OVERVOLTAGE PROTECTION
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BUILDING A
LOW-PASS FILTER FOR HF
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RESTORING A DELTA 1000
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SWR AND POWER
MEASURING, FROM MILLIWATTS TO KILOWATT
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A 40 dB RF ATTENUATOR
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MANHATTAN STYLE BUILDING: A
PUNCHING TOOL
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PIC LC METER (TEXT IN ENGLISH) updated
11/Mars/2009
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5 VOLTS REFERENCE
VOLTAGE CALIBRATOR (TEXT IN ENGLISH)
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FIXING A 'SCOPE PROBE
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SIMPLE HOMEBREW
COIL WINDING MACHINE
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SOME VXO AND "SUPER VXO" EXPERIMENTS (TEXT IN ENGLISH)
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COMPUTER POWER SUPPLY RFI
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QRP-BR SPECTROMETER
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TOWER - homebrew 46' hinged crank-up tower
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FREE FERRITE FOR ANTENNA BALUN (TEXT IN ENGLISH) pdf 600 kB
2/april/2009
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PIC PROGRAMMER 1/FEB/2006
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HOMEBREW MMIC 6/FEB/2006
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NORTON RF AMPLIFIER SIMULATION 8/feb/2006
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SDRZero - Software Defined Receiver - (SOME TEXT IN ENGLISH) updated
23/November/2006
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ANTENNAS folklore and
measurements 30/sept/2006
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DIODES - PN junction barrier voltage and use
as RF detectors
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ANTARTIC 20m SPECTROMETER
- SDR monitoring receiver ("reverse beacon") on the internet -
4/feb/2008
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Si570 LVDS->TTL single
transistor level translator - (TEXT IN ENGLISH) updated 23/May/2008
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Simple ESR meter -
25/sept/2009
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Fluorescent Lamp RFI Filter –
1/Jan/2010
MISCELLANY
Samsung CLP-300 Laser Printer cartridge EEPROM
chip replacement, reprogramming, resetting.
A (happy) note
to would-be Dremel owners
This work is licensed under a Creative Commons Attribution-Noncommercial 2.5
License
QRP
CW QSK EQUIPMENT (these are copies from printed articles)
The DM1 is a simple 1 Watt output 40m CW transceiver. It uses
direct conversion in the receiver with a 1N4148 diode doubly balanced ring
mixer built with binocular ferrite cores from TV tuners. The same is used in
the DM5. The latter is a 5 Watt output transceiver with accessories such as
RIT, SWR meter and audio filter.The two projects were based on several articles
appearing mostly in QST and books from ARRL. Of special importance
was the book "Solid State Design" by Wes Hayward,
W7ZOI and Doug DeMaw, W1FB (SK). The electronic design and
prototype construction were developed by PY2FCE (now PY2WM), housing and
mechanic dial design of the DM5 were the works of Lauro, PY2BOQ (SK). The
following links open PDF and JPEG files from the original printed articles (IN
PORTUGUESE):
DM1 (1981) (270kB)
Better resolution (PDF 8.3MB)
Loose pages JPEG 1 - 2 - 3 - 4 - 5 - 6 - 7 - 8 DM5 (1984) + ERRATA (PDF 1.1MB)
Better resolution but without ERRATA (PDF 6.6MB)
Loose pages JPEG 1 - 2 - 3 - 4 - 5 - 6 - 7 - 8 - 9 - 10 - 11 - 12 - 13 (500kB)
PC-ECAPArticle describing the electronic simulation software PC- ECAP. Although much simpler than those based on SPICE, it allows a variety of experimentation and circuit functioning foresight.
e-mail: py2wm^arrl.net (replace ^
with @) "When you can measure what you are speaking
about, and express it in numbers, you know something about it. But when you
cannot measure it, when you cannot express it in numbers, your knowledge is of
a meagre and unsatisfactory kind. It may be the beginning of knowledge but you
have scarcely in your thoughts advanced to the state of science."
Lord Kelvin. All contents of this site are the property of PY2WM.
If you copy something from here (and even if you rewrite it) please add a
reference link! Articles on this site are sometimes corrected or expanded (good
point from W8JI site).
Thanks to Huelbe and Rafael for providing PY2WM's site a home!