Ade Weiss's New Book

Big news on the QRP/homebrew literature front. One of the titans of the genre, Ade Weiss, has released another amazing book about our hobby. I really enjoyed Ade's first history of QRP, and, because it covers a more recent period (1968-1981), I think this new this one is even more interesting. I took a portion of it with me on the train yesterday (and will be doing the same for the rest of the week!) The book is a wonderful technical history. It is filled with interesting stories and with very illuminating schematics and technical discussions. Ade takes us through the exciting early days transistor transmitters and direct conversion receivers. There is a lot of discussion of the commercial rigs that we've come to know and love -- lots of HW8s and Argonauts. And Ade has made it all available as a free download! Thanks Ade!

http;//www.QRPdxPropagationAntennas.com

ADE WEISS'S NEW HISTORY BOOK -- PDF DOWNLOAD:

http;//www.QRPdxPropagationAntennas.com

THE FIVE-WATT QRP MOVEMENT IN THE US, 1968-1981

by Adrian Weiss W0RSP (ex-K8EEG),

author of

JOY OF QRP: STRATEGY FOR SUCCESS

HISTORY OF QRP IN THE US, 1924-60

IONOSPHERIC PROPAGATION, TRANSMISSION LINES, AND ANTENNAS FOR THE QRP DX’R

The Milliwatt: National Journal of QRPp

TABLE OF CONTENTS

Part 1. K6JSS and the 100-watt QRP ARCI ………………………………….......... 1

Part 2. QRP/8 Newsletter, QRPP CORNER Column, and THE MILLIWATT:
The Beginning of the Five-Watt QRP Movement in the US ... 3

Part 3. The QRP World Outside the 100-watt QRP ARCI ………………….... 22

Part 4. The QRP Takeover of the 100-watt QRP ARCI. ………………….......85

THE MILLIWATT QRPp DXCC and MILLIWATT DXCC Trophy List..........105

Adrian Weiss W0RSP’s Bibliography: Selected Technical Articles. 109

EPILOGUE: W0RSP Retro-ARRL-DX-Contest 2/18-19, 2012 Log, PIX....111

***************

IF you are interested in where our niche in the hobby came from, and would

like to read about the developments in technology caused by the transistor

and IC, and see many then-new but still-used circuits, and learn the

history of the commercial evolution of QRP gear from Ten-Tec, MFJ,

Heathkit and others, then this book is for you!

It is 115 PAGES in length in PDF FORMAT--

FREE!!! DOWNLOAD (32MEGS, ~ minute +/-) FROM:

www.QRPdxPropagationAntennas.com

-----------------------------------------------

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29% Off on SolderSmoke Book! Leap Year Sale!

Leap Year Sale at Lulu on "SolderSmoke -- Global Adventures in Wireless Electronics"http://soldersmoke.com/book.htm

Hubble Ultra Deep Field in 3D

This is about 2 years old, but somehow I missed it. It is really beautiful, and it helps keep things in perspective.

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Winterfest!

Billy and I went to the Vienna Wireless Association's Winterfest hamfest yesterday. We had a great time and met many SolderSmoke fans. Above you can see me and Randy, N3UMW, the designer of our SolderSmoke logo. Thanks again Randy!

There's Charles, AI4OT. Charles bought a copy of the SolderSmoke book at last year's Winterfest. This year he dropped by to show us his tiny Steve Weber QRP rig in an Altoids tin. FB! And he was kind enough to talk-up the book, helping me make a few sales! Thanks Charles!

We managed to get rid of a bunch of junk, and only bought one item of new junk (a Hallicrafters S-38E receiver). And we got to show our friend (and aspiring homebrewer) John what a real hamfest is all about.

Thanks to the VWS for another great 'fest.

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The ZL2BMI DSB Transceiver

Oh man, I've been a fan of this rig for many years. I first read about it in the pages of SPRAT. Today I stumbled across what appears to be an on-line version of the instruction booklet prepared by Eric Sears, ZL2BMI. Lots of lore in there. Lots of soul in this rig.

This site has three documents describing the rig. All three are a lot of fun: http://www.mightymessage.com/

Three cheers for Eric Sears! Hip-hip...


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Two Workbenches and a Mini Solder Pot

KC9LIF's bench

Hi Bill,

FB...What a great addition to your work bench. Congrats, you will put it to good use! I remember that scope when I worked at the Nuclear Physics Research Department Cyclotron at Indiana University about 30 years ago. It was the top of the line and worked great!! I lucked out by getting a Techtronics 2213 60Mhz dual trace at a Hamfest for a great price a few years back. Luck like that comes to those that wait. I recently gave my work bench a face lift... BTW, the bench doesn't look that nice now...

73,

Kent KC9LIF

Dino's bench

Bill -
Ray VK4ZW's "solder pot" idea is a good one....for another version check out Doug Hendrick's tech note at his Hendricks QRP site:

http://www.qrpkits.com/files/MiniSolderPot.pdf

Congrats on the new scope! We have finally moved to our "place in the sun" and I had the opportunity to double the size of my workbench.
73 - Dino KL0S



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Fat Tubes-day!

I couldn't resist using that title. Stephen from the UK sent me this link to Jeff Duntemann's site about Compactron tubes. Many possibilities here. I think I have a 6T9 in my junk box. These are kind of like tube versions of ICs, but with the advantage of being understandable.

http://www.junkbox.com/electronics/CompactronTubesIndex.shtml


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New Oscilloscope!

That, my friends, is a genuine dual-trace, 100 MHz Tektronix oscilloscope. Wow, a new day has dawned on the N2CQR workbench! The 'scope comes to me as a result of the generosity of friend who, like the guy in the old "Millionaire" TV show, prefers to remain anonymous. He claims this is an equipment trade, but the terms were so one-sided (in my favor), that this was really a gift.

As you can see below, the 'scope fits perfectly in the center position on the shelf above the bench. I've already put it to work -- here you see it looking at the output from the VFO of the kick panel rig.

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Book Sale!

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A Soldering Tip(!) from Australia

Ray notes that it should be mm not cm

Bill,

I heard you discussing the gadgets that you have in your shack on a recent SolderSmoke podcast particularly the small flame device that you use to remove the enamel from copper wire. I have found the following to be a fantastic way to remove the enamel and tin the wire at the same time. I was alerted to this process by Grant, VK4JAZ, who saw it on the Hendricks QRP Kits site.

Get hold of a basic soldering iron, usually around $10 - $20, and take out the solder tip (you don't need to buy a new iron if you have a spare tip but I find the separate iron allows me more flexibility during construction). Drill a hole in the base of the tip, about 5 - 10 mm, and place the tip point first into the soldering iron. The hole can be filled with solder when the iron is hot and all you do is put the enameled wire into the solder. The heat removes the enamel and the wire is tinned at the same time. The burnt enamel floats to the surface and all you need to do is skim it off before tinning another wire: Simple and neat.

Vy --... ...--,

de Ray VK4ZW

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Words of Wisdom from Farhan

I read the mail of the BITX20 group. Here is some good advice from Farhan:

I have often seen builders finishing an entire build, then powering it
up to face the frustration of a dead circuit. I suspect that the
trouble is with our kit building mind set. As a kit builder, we assume
that if it has worked well for a few hundred others, there is no
reason for it to not work for us. But the truth is more sobering ...
Of the hundred odd components, any of them could get swapped by
another, or a bad solder, wrong polarity, etc. can all conspire to
thwart your attempts. The bitx manuals are really some of the best
produced in the recent years and yet, even with leonard's videos,
troubleshooting kits is a challenge.
I am proposing a more elaborate, slower but surer approach to building the bitx.

It is as follows: build it one stage at a time, use one stage to test
the next. For instance, one could start with the bfo first. Just a
single transistor with the crystal. Then use an RF probe to check the
rf output. If there is no output, then sort that out before proceeding
to the next stage. With the addition of the buffer amp, the output
should go up. Then one could proceed to the audio amp. Injecting audio
from your mp3 player or computer could check that it works. Next,
replace the audio source with the mic amp, this tests the mic amp.
Now, if you add the two diode modulator, you should be able to receive
the dsb at 10 MHz on your HF transceiver.

This approach tests each stage individually and in isolation before
proceeding to the next. It also provides wholesome education to the
builder. In software industry, it is called a 'test driven
development' method of developing software.

In the end, this approach is no slower than the current approach,
except that surprises are not kept for the last.

I am sure that some of us can come out with a sequence of stages to
build where each stage is tested using the previous stage.

As much as bitx is about building it cheap, it is also about learning
your radio from inside. Bitx is also education on the cheap, don't
give up that opportunity.

- farhan VU2ESE

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Kick Panel Rig: EXPOSED!

There it is, sans kick panel. You can see the breadboard (a real one!) on which it is built. The box in the center has the oscillator circuitry (currently on 75 meters, but subject to change); the box is elevated a few inches by two pieces of wood -- I do this so that the frequency control will be a comfortable distance from the table! HB-ergonomics! The AF (mic) amp is in the lower left (just a 741 op amp). You can see the adjustment pot of the balanced modulator behind the mic amp. The low pass filter of the PA is visible on the right (rest easy Steve Smith!). The switch on the right is T/R. The red switch is "spot" (or in the UK "net").

I thought I was having some trouble with RF getting into the mic amp. The audio out from the mic amp looks a bit distored when I have the oscillator and PA circuits fired up. I worked on it for a while, beefing up the decoupling on the 12 volt lines, but that didn't change things. I've decided not to worry about it, because the output signal from the final looks clean, and the signal sounds good on my trusty Drake 2-B. It may have been a test gear problem -- the 'scope probe may have been picking up some RF and may have been uglying up the AF wave form.

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