chapter presents articles, essays and features dealing with
technical, operational, regulatotory and historical aspects
radio. The layout of some of the available PDF files is my
the "ham radio" (HR) magazine, which was founded by Skip Tenney, W1NLB,
and Jim Fisk, W1HR/W1DTY and published from February 1968 to June 1990.
In its time HR was the preeminent technical magazine for amateur radio,
it had no peers and to this day published some of the most cutting edge
articles in amateur radio history. Feel free to download and circulate
any of the material presented here ...
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or Reader PDF Viewer: 1) Choose Firefox > Options > Applications
2) Select "Portable Document Format (PDF)" from the Content Type
column 3) In the Action column change from "Preview in Firefox"
to "Use Adobe Acrobat ..."
ALL ABOUT SQUEEZE-KEYING
amateurs invented and pioneered electronic Morse code keyers, but today
their knowledge of the different twin-lever keying modes is sparse.
Here is a review and thorough explanation ...
The suffix "-rama" stems from the Ancient Greek word "orama"
which means "wide view". In order to complement "All about
Squeeze-Keying" with a useful practical device, I developed the
unique PIC-based multi-mode Morse code keyer "Keyrama". It enables the
operator to get a wide view of the different keying modes, to compare
its proper logic and accurate timing with other keyers, to follow the
visualized action of dot/dash-memory and to find out to which extent
his specific keying technique really makes use of it ... German version
me take you on a time journey, back to the old days without mobile
phones and internet, when worldwide communication was a real thrill
pioneered by radio amateurs with their homebuilt equipment. Watch
the amazing short movie "CQ-DX"
which was produced in 1956 ...
This video demonstrates persistent iambic squeeze-keying without dot / dash memory at 40 wpm ...
(in German only)
geht die Leistung, die von einer fehlangepassten Last am Ausgang einer
Übertragungsleitung reflektiert wird ? Jahrelang war ich der
Ansicht, daß sie am Generator total re-reflektiert wird, so wie es von
Walt Maxwell, W2DU, ursprünglich propagiert wurde, und meine
Darstellung dieses Modells war hier zu finden. Inzwischen bin ich zu
anderen Überzeugung gelangt und warum das so ist,
ENERGIEFLUSS UND VERLUSTE AUF
(in German only)
Form des Artikels "Energiefluss auf Übertragungsleitungen", ergänzt um
die Begründung und Berechnung des Zusatzverlustes ...
sensor-paddles worked with the skin-resistance, which is a widely
varying parameter and made two electrodes necessary - in the form of
split or meandering paddles or solid paddles and a conductive hand pad.
They were very unreliable and no pleasure to operate and that's why
they gained a bad reputation. Being a passionate high-speed CW
operator, in the late 1990s I had the idea for a sensor-paddle based on
the capacitance of the human body to ground, which has a much more
settled value of typically around 200 pF. In 2011 I developed CapKey as
the latest evolutionary stage of my initial idea. The result is a
capacitive sensor-paddle controlled solely by software logic, utilizing
one single re-programmable 8-pin PIC microcontroller 12F683 instead of
discrete and specialized ICs in a very simple and easy to build circuit
a new dimension of CW perception to your receiver by incorporating
this simple audio device for pseudo-stereo reception of radio
telegraphy signals. The sound does not seem to originate from the
earphones as usual, but from the inside of your head. Multiple CW
signals in the receiver passband seem to be spreaded out
positions, while static crashes appear randomly distributed throughout
the entire space - a spatial sound sensation with depth and presence
makes CW copy unique ...
recorded a few moments on the 40m band to demonstrate
the effect of the CODEPHASER.
Before you listen to the demo, please note that it is
necessary to use stereo headphones - PC loudspeakers definitely don't
work ! Don't expect astounding but rather subtle effects,
spatial sound sensations are the normal condition for our auditory
Close your eyes while listening in order to focus exclusively on
the sound. And certainly it will take some time and
several listening sessions before you can fully appreciate
dimension of CW reception. The demo consists of 9 radio clips :
#1 (39 sec.): Sweep across the 40m CW band. The clip starts monaural,
after 15 sec. the CODEPHASER is switched in and the
appear on the right moving to the left with increasing pitch
following clips, the CODEPHASER is switched in and
out alternately (the switching moment can be identified by
a short popping noise):
#2 (18 sec.), Clip #3 (30 sec.), Clip #4 (31 sec.): CW pile-ups. A wide
filter is used to enhance the spatial effect. Pay
attention especially to G3PHO in the first and F6COW in the
#5 (16 sec.), Clip #6 (19 sec.), Clip #7 (10 sec.): FSK-signals.
Though it makes no sense to listen to them,
quite interesting through the CODEPHASER
#8 (18 sec.), Clip #9 (18 sec.): SSB-signals.
at rare occasions in the night during the winter months and
predominantly on the 80m-band, very few radio amateurs are lucky enough
to observe a strange and most thrilling phenomenon: they can hear the
echoes of their own transmitted signals, delayed
by much more time than a trip around the globe would take.
don't hesitate to download my simple computer program mde.exe
which explains Magnetospheric Duct
Echoes (MDEs), calculates path
lengths and time delays specifically for your location and contains a
short bibliography on that topic. This small self-explanatory program
(95 KB) is absolutely save to use on any Windows platform
neither generate nor touch any files on your system. Always keep a
recording device attached to your transceiver and ready to go - who
knows, maybe you are one of those few lucky radio operators
who ever experience these rare echoes ...
COOTIE, SIDESWIPER OR DOUBLE SPEED KEY
a passionate CW
operator, after 35 years of mainly high-speed operation with electronic
keyers I felt more and more bored listening to the uniform and
impersonal sound of CW signals on the amateur radio bands. That's why
2008 I found myself a new challenge: to build and learn to operate a
Cootie key. The picture shows my homebrew Cootie #1. Please
that this is NOT a paddle to operate an electronic keyer, and it is
also NOT a semi-automatic key or "Bug" ! In fact, the dots and dashes
are both made manually by horizontal movement of the blade. If properly
resulting CW note sounds very distinct, melodic and a little
bit corny ... My main key is still
electronic ("CMOS Super Keyer II" with a homebrew
Sensor-Paddle which works much better than common sensors by utilizing
the capacity of the human body instead of the skin resistance).
However, operating the Cootie makes a lot more fun, is a most
natural way of sending morse code, and learning to master it
a true challenge which took me more than two years. So you can
hear me on the air - not always
but often - with my sweet sounding Cootie ...