Practical Wireless №5 2020.pdf

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www.radioenthusiast.co.uk
MAY 2020
THE UK’S NUMBER ONE AMATEUR RADIO MAGAZINE SINCE 1932
OPEN FOR
16-pages of deals all
BUSINESS
with home delivery!
Marconi Project
The latest news on the
Challenger restoration
Bright Spark
Bluetooth dualband handheld
with phone compatibility & torch
Prosigns and Abbreviations
in Amateur Radiotelegraphy
A look at the origins of the prosigns and
abbreviations we use in Morse today
Which way to go?
Switching between vertical
and horizontal polarisation
Worldwide remote
shack digital modes
Accessing your shack remotely
for digital modes operation
Latest News!
Readers’ letters
New products and club news
Two pages of your views & opinions
Display until 14th May 2020
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Contents
5
Keylines
on ot er top s on re e ts on re ote opera-
tion in modern amateur radio.
May 2020 Vol.96 No 5
On sale: 9 April 2020
Next issue on sale: 14 May 2020
ISSN 0141-0857
7
News
P s ont ly ro nd p of ne s fro t e U and
internationally, including new products, club news
and recent events.
Practical Wireless
Warners Group Publications plc
The Maltings
West Street
Bourne
n sP 0 P
www.warnersgroup.co.uk
Tel 01778 391000
Editor
Don Field G3XTT
practicalwireless@warnersgroup.co.uk
Designer
Mike Edwards
mike.edwards@warnersgroup.co.uk
Advertisement Manager
Kristina Green
01778 392096
kristina.green@warnersgroup.co.uk
Advertising Production
Nicola Lock
nicola.lock@warnersgroup.co.uk
Marketing Executives
Katherine Brown
katherine.brown@warnersgroup.co.uk
ke der
luke.hider@warnersgroup.co.uk
Publisher
Rob McDonnell
robm@warnersgroup.co.uk
Subscriptions
Subscriptions are available as little as £11.
Turn to our subscriptions page for full details.
Subscription Administration
Practical Wireless Subscriptions,
Warners Group Publications plc
The Maltings, West Street
Bo rne n s P 0 P
Tel: 01778 395 161
subscriptions@warnersgroup.co.uk
Components for PW projects
In general, all components used in constructing
PW
projects are available from a variety of
component suppliers. Where special, or difficult
to obtain, components are specified a supplier will
e oted n t e art le.
Photocopies & Back Issues
We can supply back issues, but we only keep
them for one year. If you are looking for an article
or review that you missed first time around, we
an st ll elp. f e don t a e t e a t al ss e
we can always supply a photocopy or PDF file of
the article.
Technical Help
We regret that due to Editorial timescales, replies
to te n al er es annot e en o er t e
telep one. ny te n al er es are nl kely to
re e e
ed ate attent on so f yo re re
help with problems relating to topics covered in
PW, please either contact the author of the article
directly or write or send an email to the Editor and
e ll do o r est to reply as soon as e an.
9
Review: the Senhaix 8800
r y
takes a look at a d al- and
handheld that is colourful, includes a torch and can
be programmed from your Smartphone!
12
Review: the InnovAntennas XR6
Ste e reland 6 looks at a o pa t
a
antenna s ta le for Soft are e ned ad o and
offers so e eneral ad e on p tt n to et er an
Yagi antenna from a kit of parts.
18
Notes from a Small Station
Joe Chester MW1MWD continues his theme from last
month of using an end-fed wire antenna.
9
45
Soldering Coax Connectors (Part 2)
Tom Morgan ZS1AFS explains how to put connectors
on 7mm coaxial cable.
22
Valve & Vintage
Michael Jones GW7BBY continues his story of the
Marconi Challenger and its restoration.
28
Antennas Using Fibreglass Poles
46
Radio Bookstore
Your one-stop shop for hobby-related titles, biogra-
phies, reference titles, historical accounts, technical
advice and successful building projects.
on
e plores t e any ays n
re-
glass poles can be used to support a wide range of
antennas.
34
Worldwide Remote Shack Digital
Modes
48
Doing it by Design
Eric Edwards GW8LJJ describes an 80m AM trans-
tter t t o ed fre en es and a
.
a on lley US offers a o pre ens e ntro-
duction to accessing your shack remotely for digital
modes operation.
52
What Next
Colin Redwood G6MXL looks at societies that focus
on a particular aspect of our wide-ranging hobby.
42
HF Highlights
Steve Telenius-Lowe PJ4DX reports on a busy month
on t e
ands.
56
Carrying on the G3RJV way
ee ldr d e
B nds a se for anot er of eor e
o s
s pro e ts.
58
World of VHF
r y
d s sses antenna polar sat on at
reports on a fas nat n oon o n e a e e-
ment and has all the latest operating news.
61
Making Pretty Panels
Dr Samuel Ritchie EI9FZB describes his approach to
n o e re ear a profess onal n s .
64
Data Modes
58
Mike Richards G4WNC starts with his new book, but
focuses this month on a cheap but cheerful APRS
node.
Sign up to our FREE email newsletter at www.radioenthusiast.co.uk
4
PRACTICAL WIRELESS
May 2020
Keylines
W
42
67
Rallies
Locate a rally or event near you; we have our usual
comprehensive list.
68
Origins of Prosigns and
Abbreviations
Tony Smith G4FAI describes the origins of many
of the prosigns and abbreviations we use in Morse
today.
72
Making Waves
Ste e
te
looks at o profess onal
radio users study and measure the ionosphere.
hat a difference a month
makes. Just a few short
weeks ago I had a very
pleasant visit from the
TX Factor team, catching up with me
to discuss
PW
but also how I am set-
tling in to my new home and getting
back on the radio. You’ll no doubt get to
watch that along with their visit to our
VHF columnist
Tim Kirby GW4VXE
in a
forthcoming episode.
But now things have all changed,
with us all in lockdown as a result of the
Coronavirus. As I write this, we can go
out for essential shopping and one pe-
riod of exercise a day but otherwise are
confined to the hou e. he good new
that amateur radio is the ideal hobby in
the circumstances. While we can’t go to
club meetings, we can sit at home build-
ing stuff and operating, keeping in touch
with friends over the radio. Yes, maybe
ragchewing will come back into favour,
with nary a free channel on 80m or 2m.
AM Operation
This month in our
Doing it by Design
slot we feature an AM transmitter for
the 80m band. While AM may seem ter-
ribly old-fashioned, it’s interesting how
it continues to hold sway among some
amateurs and there’s no doubting that
there is something about the sound of
a good-quality AM transmission com-
pared with SSB. The nice thing is that, as
amateurs, we can choose to use ‘legacy’
modes such as AM and, as our article
demonstrates, can use modern circuit
design to enable it. Many of us, myself
included, came into the hobby after hear-
ing amateurs on AM on the 160, 80 or
40m bands. That route into the hobby is
largely unknown nowadays but maybe
we will see a resurgence of interest when
casual listeners hear those modern-day
AM nets taking place!
PW Authors
I was checking recently and found that,
as of last month’s issue, we have had
149 authors contribute to the magazine
since I took over as editor six and half
years ago. I’m very proud of that but
there’s always room for more and,
indeed, I have several articles in the
pipeline from new authors.
That said, I get a lot of material for
the
Valve & Vintage
slot along with
expedition write-ups and the like. But
I would love to have more input on
microwave band operating, amateur TV
and other specialist but relevant areas
of the hobby. And always, of course,
constructional projects, whether simple
ones for our
Practical Way
slot or more
complex for
Doing it by Design.
I have in
mind a constructional article competition
at some time on the future, when life
returns to normal, but do think about
what you might be working on or, indeed,
about writing up a project that you
already have in hand. Home construction
remains a very satisfying part of the
hobby and although we may not all
be comfortable with surface-mount
components and the like, there is much
we can do with more familiar discrete
components or with knitting together
ready-made modules.
74
Readers’ Letters
op s t s ont o er pre es t e ro er p
tuners and more.
76
Kits & Modules
Geoff Theasby G8BMI draws our attention to a cheap
U eter t at an e sed for on tor n a pl t de-
modulated audio.
Remote Operation
Another article this month deals with
remote operation for digital modes.
Remote operation continues to be a
bone of contention and this is not sur-
prising. There really is no clarity on the
subject despite it being feasible and
extensively used for several years. The
regulations vary from country to country
and, quite apart from what the licensing
regulations may be, there are different
rules for various awards programmes
and contests. But there is no doubt that
remote operation has its place in the
hobby, whether it is simply to allow you
Continued on Page 78
28
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May 2020
PRACTICAL WIRELESS
5

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