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Issue #7 Spring 2006
JOURNAL OF THE AMERICAN QRP CLUB
OH2NLT
OH7SV
JUMA TX1 Transmitter
The "mate" to the JUMA RX1
Feature Projects:
JUMA Transmitter, PNW15 Transceiver, Using Power Supplies, GPS & Morse
Code, PipeVert Antenna, The Best Antenna, Measuring Crystals, 80m SSB
Rx, A Better Crystal Set, Transformer Checker, OctaRing Antenna, Gorrilla
Coil Design, MicroVert AntennaEL, HamCalc83, QuickieLab, Tilt-Over
Antenna, Human Power, Squirt 80m Antenna, Warbler Deluxe
Also included:
QRP Operating, Tuning Up, QRP Contesting, Test Topics & More, Handyman
Guide
For electronic builders, experimenters, radio operators,
and low power enthusiasts everywhere.
www.amqrp.org
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TABLE OF CONTENTS
Editorials , by Carl Hyde, W2CSH and George Heron, N2AP
PNW15 QRP Transceiver , by Wayne McFee, NB6M
A 15 Meter, QRP CW Transceiver that makes use of very efficient construction techniques.
The Gorilla Coil , by Tony Catalano, WW2W
Tony builds a coil to load the Empire State building and in the process learns a new use for cardboard.
SolderSmoke , by Bill Meara, N2CQR
Something new in ham radio: the first EchoLink podcast.
The MicroVert Antenna , by George "Murph" Murphy, VE3ERP
A small stealthy antenna for antenna restricted homes or emergency communications.
Ever had a need to announce GPS information like latitude, longitude or a precise 1-second beep? Read on to discover
how N2LO developed a unique approach by converting GPS data to Morse code and transmitting it to a SW receiver.
Here is what I have done to two old computer power supplies. I didn't want to haul them to the landfill.
Measuring a Coil Form , by George "Murph" Murphy, VE3ERP
Ever wanted to measure a coil form accurately but lacked (or couldn’t find…) your micrometer? The figure on
the next page gives a helpful tip.
QuickieLab Test Bench , by Joe Everhart, N2CX
In the mood for a Quickie? Check this out this experimenter's platform for the BASIC Stamp.
In this installment, we are going to use HamCalc to work with different value components for the 555 Timer IC,
which is still the most popular IC timer. It can operate as either a one-shot timer or as an astable multivibrator. There are
many different applications for the 555. Basically it consists of two comparators, a flip-flop, a discharge transistor, an
output buffer, and a resistive voltage divider.
Designing with Electrically Shortened QRP Dipoles , by George "Murph" Murphy, VE3ERP
Your Tiny Back Yard May Be Bigger Than You Think!
External 500 milliwatt 75m Amplifier , by David Forsman, WA7JHZ
Here is an update to the 500 mw linear amplifier that makes it even more fun to operate.
and Matti Hohtola, OH7SV
The JUNA TX1 is a follow-up project to the RX1 featured in Homebrewer #6. The VFO is using DDS and the
output power is 5 watts.
PipeVert , by George "Murph" Murphy, VE3ERP
A QRP Vertical Antenna That Occupies Very Little Airspace Over Almost No Real Estate
How to be "Crystal Clear" on your homebrew filter’s performance.
AmQRP Homebrewer, Issue #7
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Copyright 2006, AmQRP, All rights reserved
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Trombone Capacitors , by George "Murph" Murphy, VE3ERP
Whenever there has been a need for an expensive (and hard to find) oddball capacity, high voltage, variable
capacitor, radio amateurs for many years have home brewed trombone capacitors.
This installment focuses primarily on techniques for homebrewing with surface mount components (SMC), for
which the least amount of documentation exists. Unlike thru-hole components, SMC is not well suited for ugly-
style of construction. A variation of Manhattan style is shown that makes building from scratch using SMC a
viable approach. Even if you build an SMC circuit from a kit, you might find this information useful.
Real Radios Have Motors , by Richard Arland, K7SZ
Most radios don’t require motors, but the really neat ones do!
The Transformer Checker , by Dave Ottenberg, WA2DJN
Make sure that transformer works before lugging it around Dayton all day.
Universal Tilt-Over Antenna Base , by George Heron, N2APB
Protect your vertical from bad weather and picky neighbors.
The OctaRing Miniature Loop , by George "Murph" Murphy, VE3ERP
Ever wonder how an Octaloop becomes an OctaRing ? Here’s how.
For those of us who love and enjoy high-frequency (HF) communications, we are indebted to Claude Elwood
Shannon and Ralph Vinton Lyon Hartley. They are the fathers of modern information theory and the authors of
the Shannon-Hartley theorem.
Simple 80m SSB Receiver , by Serge Dyilda, US5QBR
A brilliantly-simple receiver using a one chip receiver for 80 Meters
Colpitts PMT Oscillator , b y David Forsman, WA7JHZ
Following is a schematic and an image of a HF oscillator that I recently put together. I was inspired by the "Tin
Ear" receiver, but I wanted to use a Colpitts design instead. This is a good alternative to finding variable capacitors or
making varactor diode tuned oscillators.
Human Power , by David Forsman, WA7JHZ
David has found a way to keep fit and provide power for a radio. All you need is to be able to pedal and talk at the
same time.
Golden-Oldie Low-Band Antenna Formulas
QuasiQuad Antennas , by George "Murph" Murphy, VE3ERP
A small antenna that’s easy to build and modify.
A Better Crystal Set , by Phil deCaire, WA7AEI
Phil takes on a journey that ends with a project that is fun to build, useful and shows how to remove the crystal from
a crystal radio.
What is the Best Antenna? , by Joe Everhart, N2CX
This is a question that is always asked and has many answers. Here is Joe’s.
Build the Deluxe Warbler , by Ron Skelton, W6WO and George Heron, N2APB
Enhance your Warbling Experience with the Warbler RF Output Indicator, the Warbler Audio Amp, and the
Deluxe Warbler Enclosure.
TTAM: Test Topics And More , by Joe Everhart, N2CX
TTAM this time features an integrated theme. Each section describes an aspect of Field Strength Meter (FSM) technology.
The first section, Designed for Test , gives a brief overview of FSM telemetry and describes the basic module used for the
remote-reading function. Then Coming To Terms defines terms and a method for preprocessing the information to be sent
AmQRP Homebrewer, Issue #7
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to make it easier to interpret. Finally Stimulus and Response gives some clarification and enhancement for adjustment of
the NJQRP FSM, the Sniffer.
Bring up QRP operating, and most often conversation turns to the high frequencies – 40- and 20-meter CW
leading in the popularity polls. But there’s a fabulous low-power world to explore at very high frequencies!
Tuning Up , by Richard Arland, K7SZ
Leave it to the Amateurs to pioneer every single mode and method of communications that we now enjoy world
wide.
QRP Contesting , by Ken Newman, N2CQ
I'm guessing that the average HOMEBREWER subscriber is "melting solder" more often than into contesting. QRP however
has many other fun outlets and what could be more fun than making your own rig or kit and using it in a contest to see how it
well does? Plus, three month forecast of contesting events.
Each springtime we host the Atlanticon QRP Forums in Timonium, Maryland. Make plans to attend a full Saturday of QRP
talks presented by experts in our field, and have fun at the festivities surrounding these presentations on Friday and
Saturday evenings. Then take a bit of time on Sunday to attend the most popular hamfest on the eastern US seaboard: the
Greater Baltimore Hamboree and Computerfest, which is within walking distance of the Atlanticon hotel!
The American QRP Club, Inc.
Directors:
George Heron, N2APB, email n2apb@amqrp.org : President
Joe Everhart, N2CX: email n2cx@amqrp.org : Treasurer
Richard Arland, K7SZ: email Richard.Arland@verizon.net : Secretary
Homebrewer Magazine:
George Heron, N2APB: Managing Editor
Alan Miner, WA1CZG, Editor
Nancy Feeny, NJ8M, Ass’t Editor
Carl Hyde, W2CSH, Ass’t Editor
Jim Miller, AB3CV, Ass’t Editor
Kitting Operations:
Bryan Williams, AA3WM
Tom (W8KOX) & Nancy (NJ8M) Feeny
Atlanticon QRP Forum:
Bryan Williams, AA3WM
All material in HOMEBREWER is copyright 2004-2006 and may not be reprinted in any form without express written permission from the
American QRP Club and the individual author. Articles have not been tested and no guarantee of success is implied. Safe construction
practices should always be followed and the builder assumes all risks. HOMEBREWER Magazine is a quarterly journal of the American
QRP Club, published on CD-ROM. Each issue typically contains over 200 pages of QRP-related homebrewing construction and technical
articles intended for builders, experimenters, ham radio operators and low power enthusiasts all around the world. HOMEBREWER features
include construction projects for beginners all the way up to the advanced digital and RF experimenters. Annual subscriptions are $15 (for
US & Canada) and $20 (for foreign addresses). For information, contact editor/publisher George Heron, N2APB at n2apb@amqrp.org or
visit HOMEBREWER Magazine home page at www.amqrp.org/homebrewer .
AmQRP Homebrewer, Issue #7
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Issue #7 – Spring 2006
How Hard Can It Be?
It’s just a quarterly newsletter, how hard could it be to put it together?
This is what I thought when N2APB asked if I could help take over the editing of the Homebrewer
Magazine. As with many of us, life’s path often takes twists and turns, and George’s has recently turned
him toward a simultaneous path of a new challenging job and a graduate education. The Homebrewer
was George’s baby and one of the finest ones in QRP as well as in Amateur Radio in general. We all
look forward to each issue and it is because of George Heron and the brilliant contributors that
Homebrewer is of such merit and value to us all.
At the same time I was considering jumping in fully I was assigned the lead on a new project at Giant
Aerospace Company Incorporated where I am a senior design engineer. When I asked George just how
hard is to edit and publish Homebrewer on a quarterly basis, he sent me the list of the tasks that are
needed to put an issue to press. There are all the articles to sift through, laying out the pages, editing the
drawings and diagrams, adding editorial comment, clarifying submissions and a host of other tasks. I
knew with my new responsibilities I couldn’t give Homebrewer the time and effort it deserved. I did offer
to assist as much as I could any other helpers whom George could find. Well, George did find Al Miner,
WA1CZG who was able to do a great job handling the logistics of handling author contributions and the
mechanics of getting it all into the right format and converted to PDF files. Of course we already had
Nancy Feeny, NJ8B on the editorial staff, who along with Jim Miller AB3CV and me, was then able to
handle the editing part of material preparation. Together with George’s coaching, we have put together
some semblance of an issue. Al and Nancy provided ninety eight percent of the effort as my availability
has been even less than I thought. Had any of us known just how much work is involved in publishing the
Homebrewer we would have filtered George’s emails better!
“Why do we do it when it seems so difficult?”
So what is it that drives us to tackle the tough jobs? Well for me it was a matter of paying back
George and the other excellent contributors and designers who make up the AmQRP club, including the
NJQRP folks and the NorCal folks. In all other things East Coast and West Coast there is competition –
yet in QRP there is collaboration. The brilliant radio and accessory designs and projects that make
QRPers so special have made my hobby much more fun and interesting. Homebrewer Magazine
provides a forum for the designers of the transceivers, tuners, widgets and gadgets that we eagerly wait
for each quarter. By letting Homebrewer die we would have killed a great resource and that forum would
be lost for everyone.
QRP is the one major area left in amateur radio where you can still brag that you built it yourself. We
all know that in the overall scheme of things it is a small matter but I would have missed Homebrewer,
and certainly the many contributors would have missed it also. I am in awe of those who put their own
effort and spare time into designing a project then unselfishly take the time to document it and share it
with the rest of us. So I say to all of you who are reading Homebrewer issue 7 that you should thank Al
and George and that we will work harder each issue to hopefully make it as good as George did. Thanks
for your patience and enjoy issue 7.
72, Carl Hyde, W2CSH
AmQRP Homebrewer, Issue #7
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Copyright 2006, AmQRP, All rights reserved
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