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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
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Simple Wire Vertical Antenna –
15/May/2011
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 (substitute @ for ^) "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.
“One test result is worth a thousand expert opinions”. This has been attributed to a range of people, but most authoritatively to Wernher von Braun, the rocket scientist.
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!