Practical Wireless - July 2022

76 Pages·2022·26 MB·English

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How to build a ‘new’
QQRRPP vvaallvvee ttrraannssmmiitttteerr
Meeting the Voice
The Face Behind the Call
profiles Jim Lee G4AEH
EDEN
PROJECTS
Spectrum Analyser
Using the versatile and compact
We test the £50 TinySA to
see if it’s money well saved
Eden dsP processor in home builds
PRACTICAL HF 9-Band PRACTICAL Building an
Portable Antenna Project All-band HF Receiver Pt VII
Build a handy mobile antenna that This month we focus on the circuitry
covers nine HF bands from 80 to 10m of our home build SDR-based receiver
NEW PRODUCTS YOUR LETTERS
Latest gear and news across the hobby Opinions from readers like you Display until 14th July 2022
Contents
July 2022 Vol.98 No 7
On sale: 9th June 2022
Next issue on sale: 14th July 2022
ISSN 0141-0857
Practical Wireless
Warners Group Publications plc
The Maltings, West Street
Bourne, Lincs PE10 9PH
www.warnersgroup.co.uk
Tel [phone]
Editor
Don Field G3XTT
[email protected]
Designer
Mike Edwards
[email protected]
Advertisement Manager
Kristina Green
01778 392096
[email protected]
Production Manager
Nicola Glossop
[email protected]
Production Assistant
Charlotte Bamford
[email protected]
Marketing Manager
Katherine Brown
[email protected] 16
Marketing Executive
Luke Hider
[email protected]
5 News
Publisher
Rob McDonnell PW’s monthly roundup of news from the UK and
[email protected]
internationally, including new products, club news and
Photocopies & Back Issues
We can supply back issues, but we only keep recent events.
them for one year. If you are looking for an article
or review that you missed first time around, we 8 PW at 90
can still help. If we don’t have the actual issue
we can always supply a photocopy or PDF file of A look back at PW’s seventh decade.
the article.
Technical Help 10 An HF 9-Band Portable Antenna
We regret that due to Editorial timescales, replies
to technical queries cannot be given over the Charles Wilson M0CDD describes a handy portable
telephone. Any technical queries are unlikely to
receive immediate attention so, if you require antenna that covers nine HF bands, 80 through 10m,
help with problems relating to topics covered in including 60m. 10
PW, please either contact the author of the article
dwiere’lcl tdloy ooru wr brietes to tro s reenpdly a ans e smoaoinl taos twhee Ecdainto.r and 16 The Eden dsP Card
Ron Taylor G4GXO describes a versatile and compact 28 HF Highlights
MAGAZINE & BROCHURE PRINTER Tbhy iWs paurnbelircsa Mtioidnl aisn pdrsi nPtLeCd 16bit DSP processor for radio projects. Steve Telenius-Lowe PJ4DX starts with the loss of two
WARNERS Telephone: [phone]
Midlands PLC well-known operators and then turns to news of what
20 The Face behind the Call has been happening on the bands.
SUBSCRIBE TO PRACTICAL WIRELESS
Roger Dowling G3NKH meets broadcaster Jim Lee
wwwwww..rraaddiiooeenntthhuussiiaasstt..ccoo..uukk For the latest offer call G4AEH. 32 The World of VHF
JULY 2022 TTTHHHEEE UUUKKK’’’SSS NNNUUUMMMHQQBBBEEEoRRRRR OOOwNNPPNEEE AAAtvvMMMoAAAaa TTTbEEllEUUvUvuRRRe e RRRiAAAl DDttDdIIIrrOOO aa MMaMAAnAn GG‘GnAAssAZZZmmeIIINNNEEwE SSiiSIIttINNN’ttCCCeeEEE 11r1r99933 3222 01778 395161
Tim Kirby GW4VXE has another full column, starting
NLPBcPaouoEPUEtvRieleErdsrAsd tsata C ignhWebniaDenTRlnneaeIdg rHCy A F damAtP nnbohsLaEdtObenPi elRdn enHs e an fFpvwnrOaNot esJ9erm Pn -ao nr8BrDcaE0osc rat otjhaoneeasU 1tsdct s0 CtitmhsCleeo hT roaT binSbnyd hS cYOoopATomPOfhim lnRiolsiu- oAemrbU nphCoa sonbTan RmtfhrIdueco Cw bmH iteuA Ll ifFlrLoddec RS aEu sBDsdeR uoecT-nbrie salTpMSWstidh serhTplvoeeeieeiek e fde nt ciiFeee lfcierEr argsei tcstt cytci’P u sr eaJtneo ihuR mititBnmugrve myVeeo £thLrnI5hSie enAI0eyed nTGw Vtiha4neoDeisyAllplla iSyy CEusnctAil saH1a4eth v elJtulloye 2r02d 2 SSeaeve p uapg eto f o2u7r% fo.r details. a2 2S pTeicntyrSuAm: Analyser for £50! wAliltsht anre nwosd oef. an interesting hub for accessing an
Read on any device, anywhere, anytime
at bit.ly/pw-sub22 Michael Jones GW7BBY gets up close and personal
with a tinySA analyser. 38 SDR (Pt VII)
Keep up to date on Facebook Dr Samuel Ritchie EI9FZB finishes the circuitry of the
www.facebook.com/radioenthusiasts 26 That’s Fritzing Amazing! all-band HF receiver based on the quadrature product
Follow us on Twitter Billy McFarland GM6DX describes how to design and detector (QPD), as described in the January 2022
@REnthusiasts produce a PCB the easy way. edition.
Sign up to our FREE email newsletter at www.radioenthusiast.co.uk
2 PRACTICAL WIRELESS July 2022
Keylines
Just one gathering for me this month
(May), which was the CDXC (the UK DX
Foundation) Convention in Loughborough.
We had a great day with some fascinating talks,
covering wire antennas, remote operation, an
8-circle receive array, using Smith charts and
an insight into planning for the forthcoming
Bouvet Island DXpedition. But, of course, the
greatest aspect was actually meeting fellow
amateur in person yet again – many of them I
haven’t seen since before COVID came along.
As for operating, my main focus this month
has been on 6m and 4m, as the Sporadic E sea-
son gets under way. It makes a change from
the winter when my focus is invariably on the
low bands, especially 160m and 80m. dio magazines that have come and gone, we are
still going strong thanks to you, our supportive
Valves
readership.
46 This month we feature a vintage valve transmit-
What is a
ter and next month have a valve receiver, both
Communications Receiver?
as part of our 90th anniversary ramblings. I
46 Brickworks Relaunched for 2022 hope you enjoy them. Many of our readers grew Well, I haven’t exactly been deluged with re-
The RSGB explain the Brickworks scheme and what it up on valves and thought nothing of playing sponses to my challenge last month, but my
might mean for you and your club. around with them. Nowadays, they are regard- thanks to Philip Moss M0PBM for adding his
ed by some as dangerous and to be avoided personal take on what is meant by a communi-
47 Introduction to Microwaves (Pt IV) although I still rate valved linear amplifiers as cations receiver. You can find his explanation in
Ian Dilworth G3WRT turns his attention to EM Model- generally being superior to solid-state ones. this month’s Letters pages.
ling, simulating Antennas and Radiowave Propagation But I do find it amusing that my parents’ port-
This Month
parametrically in 2022. able radio used valves. I believe, from memory,
that it was an Ever Ready model and used a We have another eclectic collection of articles
52 A Valve transmitter for 2022 dual-voltage battery, 1.5V (for heaters) and this month, ranging from a 9-band HF wire an-
John Seager G0UCP describes a QRP Van Winkle 69V (for HT). And one of my earliest electronic tenna to one on antenna modelling at micro-
transmitter, recalling days of yore. experiences was dismantling our old (single- waves. And a look at the TinySA – these amaz-
channel, black & white, with cathode ray tube) ing pieces of test equipment just get smaller
55 Data Modes TV for parts. and cheaper!
Mike Richards G4WNC goes somewhat batty this And do check out the article on making your
Your Reminiscences
month, while exploring how to analyse data. own PCBs – it’s easier than you might think. The
On a visit to Malta a few years ago I went along pity is that we generally need to order the boards
58 Build the PW Paston (Pt VI) to the radio club and was informed by the from China or Hong Kong because UK suppliers
Mark Tuttle G0TMT turns this month to the transmitter Chairman that several members owed their require orders in their thousands rather than the
side of the Paston transceiver. successful careers in electronics to a healthy penny numbers that we home constructors are
diet of PW in their early days. And when giv- interested in. The good news is that the boards
61 A Lab Tutorial ing a talk some time back to one UK club, I was come quickly and are of high quality – one friend
Jeff helps Natalie get to grips with large numbers and confronted by not only a PW ‘blueprint’ from of mine has been using them for quite complex
ratios, by using exponents and decibels. the 60s, but also the radio that had been as- double-sided boards using surface mount com-
sembled from it, which was still in good work- ponents and has been delighted with the results.
64 Valve & Vintage ing order! As I say in this month’s ‘PW at 90’
John Birkett SK
Bernard Nock G4BXD describes a German UHF system feature, it would be great to have some similar
that has recently found its way into his museum. reminiscences for publication in our 90th anni- To finish, I was sorry, and I’m sure many PW
versary issue (October 2022 cover date), which readers will be too, to note the passing of John
68 Rallies means I’d love to have anything from you by Birkett at the grand age of 93. He advertised in
Locate a rally or event near you; we have our usual early August as I will be preparing that issue in PWfor many, many years. I wrote a short piece
comprehensive list. August (it will go out early September). It can about his shop in the March 2020 issue of PW.
be pretty much anything related to the maga- Truly the end of an era.
69 Readers’ Letters zine. I love to hear these stories of how PW
What is a communications receiver? A reader has influenced earlier generations so do get in Don Field G3XTT
responds. touch! The good news is that, unlike other ra- Editor, Practical Wireless Magazine
Read more radio news and reviews at www.radioenthusiast.co.uk/news
3
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InnovAntennas’ 4-Element 10 PRACTICAL WIRELESSMay 2022 May 2022PRACTICAL WIRELESS 11
50MHz LFA Yagi reviewed
IIICCCOOOMMM IIIDDD---555222
Keep Soldering On
We review the first handheld A handy artisan soldering
to feature a waterfall display platform for home projects
GEAR A Deeper Look TEST Protect Your Rig
at Microwave Antennas from Lightning Strikes
This month we focus on microwave, A dual antenna disconnector from
millimetrewave & terahertz versions Paradan Radio given the once over
NEW PRODUCTS YOUR LETTERS
Latest releases from the manufacturers Three pages packed with opinions Display until 12th May 2022
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iadadGpa iydedheyogeehdtoiigoti ieo n:e ne:b cselbetel s ecPet fiuPpt afiput anhp rongphtosrMgt ,slMrloan l alr,oncel-Sm leceeS -me eeoo o ooe uoo puoppfnplnfael aiec icn lpeinvlpeisvrn(ipesrlnpie(aaslae.aset.cte c~caie e~cai e0 irhog irhprogc lrptclrtaf,rearfr,ted1rtird1hiarho oa eroo o ensountusnn ti i . e .suewsmocauwroemca rre5er e5ae aee rtednrtddndpasdGdpsaGp.ebp.debdss d. d uv o.u vo wHe woHe o e baaerbaarsdsudzauazt trsn rsni-iat-)yat)rymrmt2dt ,d a,b abbr rb t t aypalyposlasoaeFet lt lil is lees een- n-uull e gogossltlteeee a.. 2ture
News
Newsdesk
Have you got something to tell our readers about? If so, then email [email protected]
Icom Engineer
Geoff Boakes G8PPQ
Retires after 31 Years
Everyone at Icom UK was sad to see Geoff Boakes
G8PPQ hang up his soldering iron and retire
recently after 31 years of loyal service as one of
their top Service Engineers. Geoff is now set for his
well-earned retirement. He plans to keep himself
busy with his hobby of making antennas and
playing amateur radio.
Bob Stockley, Icom UK’s Managing Director said,
New from Nevada Radio “Having worked for us for so long we are incredibly
sad to see him go, but not without our best wishes
for the next stage of his life”.
Nevada Radio have announced that they now have the new Tecsun DEGEN DAB119x portable radio The photo shows Geoff on the right.
in stock. This radio covers DAB+, FM stereo (with RDS display), Medium Wave and Shortwave and
features Bluetooth 4.0 capability.
Foundation Course
It will automatically tune and store stations into memory, has an alarm clock, date/time display and
a built-in charging function. Shortwave coverage is from 2300kHz to 26100kHz with an extra-large Leigh M5GWH is looking to run a Foundation
LCD display to aid tuning and an external antenna input for DX reception. The Bluetooth 4.0 enables course in North Staffordshire for those who don’t
linking to other Bluetooth enabled devices for streaming music or other material through the radio. wish to take the online route. No dates are yet set
The radio can be charged from the included mains charger or through its USB socket. It will sell for in stone but expect a start before the Summer with
£139.95 and is available from UK Distributors Nevada Radio: the course running from 10am to 1pm on Sundays.
www.nevadaradio.co.uk It will last for five or six weeks, including the exam.
www.hamradiostore.co.uk The course is open to everyone of all ages and the
venue in Stoke on Trent is disabled friendly. Tuition
is at a leisurely pace, suited to those who’ve not
Commonwealth Games Activities
been in the classroom for a long time. The course
costs £40, which includes revision materials, your
The Commonwealth Games will be held in Birming- it is planning to link with the Games. You can get RSGB exam fee and a contribution to the school
ham later this summer. It will see around 4,500 involved in one of the seven special event stations radio club M0OHA plus refreshments. All you need
athletes from 72 nations and territories, compete or gain one of two special operating awards. Find to buy is the Foundation book. Contact Leigh who
in 19 sports across 14 competition venues. The out more on the Society’s website at: is listed on qrz.com or email:
RSGB has published news of the various activities www.rsgb.org/cwg [email protected]
Read more radio news and reviews at www.radioenthusiast.co.uk/news
July 2022 PRACTICAL WIRELESS 5
News
will present an added positive flair, historical
significance and a challenge for radio amateurs
to contact. During 2021, there were over
253,283 QSOs logged.
2022 QSL cards have been kindly sponsored
by Canny Components. A warm thank you to
Amanda & Davey for this.
Ken Villone KU2US (K2A operator) is the creator
and manager of the event. Every year there is a
different certificate theme for amateurs who
make contact with either one or all participating
stations, including the bonus stations. Ideally,
amateurs taking part aim to get a ‘clean sweep’
of all 13 stations: K2A (NY), K2B (VA), K2C (RI),
K2D (CT), K2E (DE), K2F (MD), K2G (GA), K2H
(MA), K2I (NJ), K2J (NC), K2K (NH), K2L (SC),
K2M (PA), plus WM3PEN, GB13COL & TM13COL
operating as bonus stations. Contacts made
will be endorsed on to the certificate along with
your own personal callsign.
The theme for 2022 is the Revolutionary War.
There is also an opportunity to exchange QSL
cards with all 13 Colony State stations, plus
the bonus stations. For further information
regarding the 13 Colonies Special Event, please
visit the website at:
G3BJ RECEIVES THE MICHAEL OWEN the award in person was at the recent CDXC www.13colonies.us
VK3KI AWARD AT THE CDXC CONVENTION Convention in Loughborough. For UK QSL requests, please supply an sae to
2022: In November, it was reported that the In presenting the award, Tim said, “Don has QTHR GB13COL. If you would like to visit the
International Amateur Radio Union (IARU) had volunteered countless hours with IARU. He was club or want further information on GB13COL,
decided to give their highest award, the Michael Secretary of Region 1 twice (2002-2008), and please contact Ray G0VLF on 07904196283 or
Owen VK3KI award, to Don Beattie G3BJ, for President of Region 1 from 2014 to 2021. He email
22 years of service to the work of the IARU. The has guided IARU Region 1 through a number of [email protected]
award is not handed out every year, but only difficult issues. All told, Don spent 13 years on
when the IARU’s Administrative Council deem our Administrative Council and his contributions 2022 INDUCTEES TO THE CQ MAGAZINE
someone’s voluntary work is worthy of this whilst on our board are too numerous to HALLS OF FAME: The 2022 inductees to the CQ
honour. mention. I can tell you every person on the Contest Hall of Fame are:
Michael Owen VK3KI was a former Vice- Council valued his work and commitment to the David Pascoe KM3T, a highly accomplished
President of IARU, and a former President of amateur services and he served as wise counsel multi-op and single-op contester and, among
the Wireless Institute of Australia. He worked to the IARU and to the officers in particular. I other activities, is a volunteer pilot for two
tirelessly for the benefit of amateur radio have indeed personally benefited from Don’s organisations that provide free medical-related
services around the world and made many insight and opinion on a number of matters”. air travel.
sacrifices at international level, even to the The photograph shows Don Beattie G3BJ Craig Thompson K9CT, a world-class contester
extent of taking a leave of absence from his receiving the award from IARU President, Tim and promoter of youth in contesting. He
position as a lawyer to move to Geneva with Ellam VE6SH. is also involved in several amateur radio
his family for two months in 1982 to attend the organisations, serving as treasurer of CWops,
World Radio Conference for IARU. 13 COLONIES SPECIAL EVENT 2022: G4EUZ a board member of the Northern California DX
Michael had an encyclopaedic knowledge of Durham and District Amateur Radio Society Foundation (NCDXF), past president of the
the international radio regulations and his skill (DADARS) is privileged to be participating as Society of Midwest Contesters and is currently
in drafting amendments to those regulations one of the bonus stations in the hugely popular chairman of the ARRL Contest Advisory
on behalf of the amateur services was second 13 Colonies Special Event. The NoV special Committee.
to none. The award was established after callsign GB13COL has been issued for this There will be no inductees to the CQ DX Hall
his sudden death in 2012 to memorialise his event and will run from the club station 1 July of Fame for 2022, as the judging committee
commitment, and to recognise other people 1300UTC to 8 July 0400UTC. The primary focus determined that none of the nominees met the
who have given their time and effort as a long- of the event will be the HF bands, including VHF, high standard required for selection.
term volunteer. UHF & Satellite for QSOs using SSB, CW, FM and The 2022 inductees to the CQ Amateur Radio
When the IARU unanimously agreed that various digital modes. Hall of Fame are:
Don should receive this award, it was with The 13 Colonies event began in 2009 as a way Franklin P. Antonio N6NKF (SK), co-founder
instructions that the IARU President, Tim Ellam of celebrating American Independence with of Qualcomm, whose chips underlie much
VE6SH, bestow it on him at a suitable venue. the original 13 colony States circa 1776. Since of our modern technology. Antonio was also
COVID restrictions made that a challenge, the UK was a major historical player in the a philanthropist, donating $30 million to the
and the first opportunity for Tim to present Revolutionary War, GB13COL from England University of California at San Diego as seed
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6 PRACTICAL WIRELESS July 2022
Rallies
taking part in any special event please come
along on the day between 0900 and 1700. They
can be contacted via QRZ.com (search for
MM0PMS) or:
www.facebook.com/MM0PMS
Parton Kirk is on the left as you enter Parton
from Castle Douglas on the A713 at DG7 3NE.
DISTANCE LEARNING FOR FULL LICENCE
EXAM: Since 2011, the Bath Based Distance
Learning team (BBDL) has helped over 900
students to obtain their Full Licence. Student
feedback is always very positive and the pass
rate continues to be well over 80%, compared
with a national average of around 66%.
Having completed a second Intermediate
Licence course in May, the team are now
planning another Full Licence level course.
The course will run from the end of August to
December.
Students will receive weekly work packages
money for a new engineering building. treatments for Covid-19; DXer, contester, via an online classroom and will have access
Wolf Harranth OE1WHC/OE3WHC (SK), former editor of the National Contest Journal. to weekly online tutorials. Each student is
journalist and broadcaster on Radio Austria allocated to one of the remote tutors who
International; founder of Austria’s radio JAMES CLERK MAXWELL RADIO SOCIETY provide feedback and additional guidance.
documentary archive (DokuFunk), and 2017 GB2JCM: Based in Southwest Scotland the There are weekly quizzes to check on progress
recipient of the IARU Region 1 Roy Stevens society aims to honour the memory of James and at the end of the course there will be a
memorial award for his work on DokuFunk. Clerk Maxwell by operating special event number of mock exams.
Les Kramer WA3SGZ, inventor of lower-limb amateur radio stations on occasions relating There is no charge for the training but
prosthetic devices used by some 3000 people to him. applicants must work through some pre-course
worldwide, including two survivors of the This year they plan to organise special event material and complete a quiz to be eligible for
Boston Marathon bombing; as well as multiple stations at least twice, on the weekend of 11/12 a place. This focuses on the ‘new’ topics that
other inventions. June, to commemorate the anniversary of his were introduced to the Intermediate syllabus
Roy Lewallan W7EL, author of the EZNEC birth on 13 June and in November, on a date to in 2019. The aim of the pre-course classroom
antenna modelling software. be confirmed, to commemorate the anniversary is to make sure applicants can use the BBDL
Peter Marks AB3XC, physician and head of the of his passing on 5 November. systems and to ensure that they are ready for
US Food and Drug Administration’s ‘Operation They will operate from the Church at Parton in the Full training.
Warp Speed’ program to combat COVID-19. Dumfries & Galloway where Clerk Maxwell both Each student will need to provide their own
Bob Ringwald K6YBV (SK), well-known blind worshipped and is buried. RSGB Full Licence textbook and arrange their
jazz musician in Sacramento; co-founder of As always, they are grateful to the congregation own exam at the end of the course. Advice will
the Sacramento Jazz Festival; known locally of Parton Parish Church for allowing access. be provided as part of the course.
as ‘the emperor of jazz’ and, last but not least, After two years of disruption due to COVID, they The deadline for course applications is
father of actress and singer Molly Ringwald. hope that this year, subject to any regulations Tuesday 26 July. To request full details and an
R. Scott Wright K0MD, physician and leader in place at the time, the stations will be open to application form, please e-mail BBDL Team
of Mayo Clinic team developing the use of both amateurs and non-amateurs. Should you Leader, Steve G0FUW, via
Convalescent Plasma as one of the first be interested in joining with the Society and [email protected]
The Blitz BBBBBBBBBBBBoooooooooooowwwwwwwwwwwwoooooooooooooooooooooooodddddddddddd
in Colour EEEEEEEEEEEElllllllllllleeeeeeeeeeeeccccccccccccttttttttttttrrrrrrrrrrrroooooooooooonnnnnnnnnnnniiiiiiiiiiiiccccccccccccssssssssssss
This 132-page special collectors’ Unit 10 | Boythorpe Business Park | Dock Walk | Chesterfi eld | S40 2QR
magazine, writt en by Andy
01246 200 222
Saunders, the former editor of
Britain at War and also editor of
[email protected]
The Batt le of Britain in Colour,
covers all the military and human www.bowood-electronics.co.uk
aspects of the Blitz.
PASSIVE COMPONENTS | SEMICONDUCTORS
Print and Digital cover arts may vary
OOOrrrdddeeerrr aaattt mmmiiillliiitttaaarrriiiaaa...mmmaaa///bbbllliiitttzzziiinnncccooolllooouuurrr222111 ooorrr cccaaallllll 000111777777888 333999222444888999 OPTO | PCB  MATERIALS | ENCLOSURES| ETC
July 2022 PRACTICAL WIRELESS 7
Feature
PW at 90 Years
Don Field G3XTT
[email protected]
We’re now into the 90s and through to As Practical Wireless approaches its 90th birthday, we take
the new millennium. September 1992 the opportunity to look back at its illustrious history, decade
was an antenna special, with a review
by decade.
of the Nelson Electronics 21/28MHz cubical
quad, Experimental 430MHz Wire Antennas,
Experimenting with Beam Antennas in the Fig. 1: PW’s Diamond Jubilee issue, October
Back Garden, a look at the MFJ-247 antenna 1992.
analyser, a simple antenna tuning unit and RF
The New Millennium
bridge, a review of the Cushcraft R5 vertical
antenna and an Antenna and Associated I thought it would be interesting to close this
Equipment Showcase. There was also a reader month by looking at the very first PW of the
offer to buy a portable mast and a competition new Millennium – January 2000. Not that long
to win a Kent Morse key. ago, at least to my mind, although PW looks
Other articles included Getting Started very different from how it is today. That said,
the Practical Way by the late George Dobbs colour has found its way onto most pages,
G3RJV, an Appreciation of Fred Judd not just advertisements. There is the offer of
G2BCX, Reflections by the late Ron Ham, a PW Callbook CD, and discounts on a variety
Satellite Scene by the late Pat Gowen G3IOR, of 4m equipment (transceiver and antennas),
Mathematics for the RAE by Ray Fautley along with a very generous competition prize
G3ASG, Back Scatter (HF Bands reports by the from Nevada of a DX-70TH transceiver. SMC
late Paul Essery GW3KFE, VHF reports by David Communications were still going strong – I
Butler G4ASR and Broadcast Round-Up by would have guessed they had ceased amateur
Peter Shore) and Packet Panorama by Roger radio trading before then (they are still around
Cooke G3LDI. Yaesu were featuring the recent- in the commercial world). Indeed, there were
ly introduced FT-1000 by way of a full-page ad- still lots of advertisements, with Haydon
vertisement and Martin Lynch was celebrating Communications taking three pages and
1
two years trading under his own banner. And Multicomm 2000, who I don’t recall at all, were
still lots of advertisers – I count 51 listed in the taking four pages. Waters & Stanton were still
Index at the back of the magazine. has come and gone, unfortunately. Another advertising in the their own right, with three
new advertiser was Haydon Communications, pages at the front of the magazine. Colomor
Diamond Jubilee
set up by Mike Haydon, previously of Waters & Electronics were selling army Bakelite and
PW’s Diamond Jubilee (60 years) was Stanton. German Junker Morse keys, which presumably
celebrated in the October 1992 issue, with nowadays would be collectible and like hens’
To 1997
congratulatory letters from the then RSGB teeth to get hold of. WinRADiO were advertising
President and from the Radiocommunications By the middle of our decade, 1997, there was what I guess would be the precursor to modern
Agency, along with a number of reminiscences much more colour in the magazine, particularly SDR radios.
in response to an earlier editorial request the advertisements. The August 1997 issue The editor, (still Rob G3XFD, of course)
for readers to send these along. They make featured a review of the Yaesu FT-920, quite a mentioned that an increasing number of
fascinating reading. I’d welcome similar for revolutionary transceiver at the time because Letters were coming in over the internet, but
our October issue this year, to be published in it featured 50MHz operation in addition to HF. the majority were still in paper form and reader
September, our 90th anniversary month. PW editor Rob Mannion G3XFD had been to advertisements took up two full pages. The
There was a five-and-a-half-page article the Dayton Hamvention along with Short Wave internet, of course, has a lot to answer for –
about PW’s founder FJ Camm, again quite fas- Magazine editor Dick Ganderton G8VFH and both commercial and private advertisements
cinating. Bill James G6XM wrote about his 60 contributed a report on the event. Another have very much found their way onto it, and
years in the hobby, including some details of review was of a VHF dual-bander from ADI the availability of much information has
his early work on the 5m band, where he not Communications, the AT-600. I have to admit meant a loss of interest by many in buying
only had to build the equipment but had to find that I don’t recall this company at all. But books or monthly magazines. On the other
the band itself using Lecher line techniques! there was also a look at the Icom IC-706 Mk2, hand, it means we can, for example, make PW
Richard Morris G2BZQ was 13 years old when comparing it with its predecessor, the Mk1. available at reasonable cost internationally
PW was first published in 1932, and wrote an Now there’s a radio that I do remember. And I through electronic publishing, in an era when
article paying tribute to the many radio ama- find Ben Nock G4BXD looking not only at his international postal rates have gone through
teurs who contributed to the war effort dur- usual fare of ex-military gear but also at the the roof. And most of the material I receive
ing 1939-45. Ray Herbert G2KU looked back Codar AT5, a set that I remember well as it was nowadays comes in electronic form, with
at the early years of TV, from the 30-line days my first transmitter, while still at school. Oh, nothing on paper until my personal copy of the
onwards. The regular contributors were en- and I see Mike Richards G4WNC was already magazine drops through the door.
couraged to look back too. And as something in harness, with a column called ‘Bits & Bytes’ And, to finish, I was delighted to see a couple
of an aside, I see that the full-page back cover looking at spectrum analysis and more. The of well-drawn cartoons – maybe I should get
advertisement was by Maplin for their latest monthly HF column at that time was in the our current art editor to pick up the baton on
catalogue. Now there’s another company that hands of Leighton Smart GW0LBI. that one! PW
Sign up to our FREE email newsletter at www.radioenthusiast.co.uk
8 PRACTICAL WIRELESS July 2022
Visit our Book Store at www.radioenthusiast.co.uk
RRAADDIIOO EENNTTHHUUSSIIAASSTT BBOOOOKKSSHHOOPP
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FFeeaattuurree AArrttiicclleess QCX Plus, Martin Evans GW4TPG ....................................................................................................................Jul 58
A Lab Tutorial, Chris Murphy M0HLS ....................................................................................................Jul 26, Oct 51 Stockport Radio Society: Celebrating 100 Years of Amateur Radio (book), Don Field G3XTT ..............................Sep 54
A Transatlantic Radio Centenary, Dr Bruce Taylor HB9ANY ..............................................................................Dec 48 The GQ EMF-390 EMF Multi-Field/Multi-Function Meter, Don Field G3XTT .........................................................Aug 8
Adventures in WSPR Land, John Rowlands MW1CFN ......................................................................................Sep 18 The Radio Geeks 144/430MHz Dual-Band Infl atable Antenna, Tim Kirby GW4VXE ............................................Apr 10
AllStar, Tom Morgan ZS1AFS ........................................................................................................................Aug 66 The Radio Geeks ‘White Knight’ 144/432MHz dual-band antenna, Tim Kirby GW4VXE .......................................Oct 60
An Absolute Beginner’s Guide to FT8, Part 1, Steve and Eva Telenius-Lowe, PJ4DX and PJ4EVA .......................May 18 The Tiny SA Spectrum Analyser and Signal Generator, Tim Kirby GW4VXE ........................................................Apr 11
An Absolute Beginner’s Guide to FT8, Part 2, Steve and Eva Telenius-Lowe, PJ4DX and PJ4EVA ........................Jun 42 The VC999, Tony Jones G7ETW .....................................................................................................................Sep 52
An Introduction to Microwave Radio, Part 1, Ian Dilworth G3WRT ....................................................................Nov 20 The Wouxun 2/4m Anniversary Pack, Richard Constantine G3UGF ....................................................................Sep 8
Boutique Radios, Steve Ireland VK6VZ/G3ZZD ...............................................................................................Aug 12 The Xiegu Transceivers, Daimon Tilley G4USI .................................................................................................Oct 12
Chasing the RSGB Awards, Lindsay Pennell G8PMA ........................................................................................Oct 21 Two Antennas from Moonraker, Don Field G3XTT............................................................................................Jan 18
Complex Numbers for Dummies, Dr Doug Fenna M0DSF .................................................................................Jun 62 What’s a ZM-2? Richard Constantine G3UGF ..................................................................................................Mar 20
Learning/Improving your CW with CWops and CW Academy, Daimon Tilley G4USI ............................................Jan 58 Yaesu FTdx10, Don Field G3XTT .......................................................................................................................Jul 8
Morse Revealed, Part 1, Mike Bedford G4AEE ................................................................................................Mar 46
Regulars
Morse Revealed, Part 2, Mike Bedford G4AEE .................................................................................................Apr 44
Amateur Radio on a Budget
Practical Portable with the Icom IC-705 and Other Radios, Richard Constantine G3UGF .......................................Jan 9
Daimon Tilley G4USI .......................................................................................Jan 65, Apr 22, Jun 50, Aug 50, Nov 54
RCF Supports School Radio Clubs, Steve Hartley G0FUW ...............................................................................Nov 26
Carrying on the Practical Way
The Kenwood Hybrids, Gary Clark G0BKR .......................................................................................................Dec 16
David McAlpin GM8UPI ................................................................................................................................Aug 22
Top 10 FT8 Operating Tips, James Stevens M0JCQ .......................................................................................May 46
ZD9CW – A Trip to Tristan da Cunha, Steve Taylor G4EDG ................................................................................Feb 46 Tim Walford G3PCJ and Geoff Budden G3WZP ...............................................................................................Jan 52
Tony Jones G7ETW ......................................................................................................................................Mar 43
Projects & Practical Data Modes
160m Vertical Antenna for home and portable use, Mike Richards G4WNC ................................................ Jan 43, Feb 43, Mar 53, Apr 53, May 53, Jun 22, Jul 61, Aug 56,
Chas Wilson M0CDD ....................................................................................................................................Sep 22 ...................................................................................................................................Sep 48, Oct 61, Nov 50, Dec 26
A Dual-Band 6m and 4m Wire Dipole, Vince Lear G3TKN .................................................................................Sep 59 Doing it by Design
A Simplifi ed Directional 40m Antenna, Part 2, Bob Whelan G3PJT ....................................................................Jan 46 Eric Edwards GW8LJJ .........................................................................Jan 26, Mar 22, May 56, Jul 63, Sep 12, Nov 63
Afraid of SMDs, don’t be! Michael Jones GW7BBY ..........................................................................................Apr 56 From the Ground Up
An Arduino CR Meter, Tony Jones G7ETW ......................................................................................................Aug 59 Eric Edwards GW8LJJ ..........................................................................Feb 50, Apr 64, Jun 45, Aug 46, Oct 56, Dec 60
An Eight Way Remote Antenna Switch, Ken Ginn G8NDL .................................................................................Mar 56 HF Highlights
Build a Frequency Counter, John Dunton G1RXC .............................................................................................Feb 56 Steve Telenius-Lowe PJ4DX (G4JVG) .................................................Jan 62, Feb 18, Mar 50, Apr 50, May 50, Jun 18,
Building the Walford Electronics Ilton DSB Transmitter, Richard White G6NFE ..................................................Mar 14 ..........................................................................................................Jul 54, Aug 26, Sep 26, Oct 26, Nov 16, Dec 32
Experiments on 6cm, Bernard Nock G4BXD ....................................................................................................Dec 64 In the Shop
Getting a Quieter Radio Life, Steve Ireland VK6VZ/G3ZZD ...............................................................................Feb 60 Harry Leeming G3LLL....................................................................................................................................Feb 14
Low Noise Antennas and Receiver Front-End Protection, Vince Lear G3TKN ......................................................Jul 50 Kits and Modules
Metal Oxide Varistors and their Uses, Colyn Baillie-Searle GD4EIP ...................................................................Apr 13 Geoff Theasby G8BMI .......................................Jan 48, Feb 42, Mar 42, Apr 42, May 22, Jun 24, Jul 15, Sep 58, Oct 20
My ATUBox, Martin Waller G0PJO .................................................................................................................Aug 62 Making Waves
NanoVNA: Can You live without One? Michael Jones GW7BBY .......................................................................May 42 Steve White G3ZVW .............................................................................Jan 54, Apr 18, May 14, Jul 46, Sep 46, Nov 23
Quartz Crystal Oscillator and Tester, Ian Dilworth G3WRT ..............................................................................May 48 Morse Mode
Repairing a Logic Probe, Dr Samuel Ritchie EI9FZB ........................................................................................May 38 Roger Cooke G3LDI ........................................................................................Feb 54, Apr 48, Jun 48, Aug 55, Oct 54
Repurposing Inductors, Dr Samuel Ritchie EI9FZB .........................................................................................Nov 38 Notes from a Small Station
SDRPlay RSP1A: CW Skimmer Install, Billy McFarland GM6DX ........................................................................Dec 38 Joe Chester M1MWD .................Jan 38, Feb 38, Mar 38, Apr 38, May 61, Jun 38, Jul 38, Aug 38, Sep 38, Oct 38, Dec 46
Simple Microwave Antennas, Bernard Nock G4BXD ........................................................................................Jun 13 Technical for the Terrifi ed
Tapkey, an Electronic Straight Key, Alpar Cseley HA8KT ...................................................................................Jul 22 Tony Jones G7ETW ...............................................................................................................Feb 64, May 24, Nov 60
The Festive Antenna, Mark Foreman G7LSZ/SA6BID .......................................................................................Jan 14 Valve & Vintage
The VK6LW BDB Antenna, Steve Ireland VK6VZ/G3ZZD .....................................................................................Oct 8 Bernard Nock G4BXD ............................................................................................................Jan 49, Jun 57, Sep 55
Reviewed Dr Bruce Taylor ............................................................................................................................................Mar 62
AMPRO Mobile Antennas and the Portable ‘Field-Kit’, Richard Constantine G3UGF ..........................................Jun 10 John Adams G3ZSE ......................................................................................................................................Feb 22
Anytone AT-779UV Dual-Band Mobile, Tony Jones G7ETW ................................................................................Jul 48 Philip Moss .........................................................................................................................May 63, Aug 18, Nov 40
Comet HFJ-350M ‘Toy Box’ Antenna, Richard Constantine G3UGF ....................................................................Oct 48 Ray Howes G4OWY .......................................................................................................................................Dec 54
Exploring the Diamond 144S-5 & A144S-10 Antennas, Richard Constantine G3UGF ..........................................Dec 10 Scott Caldwell ..............................................................................................................................................Apr 61
Icom AH-705 tuner, Richard Constantine G3UGF ..............................................................................................Jul 12 Tony Smith G4FAI ...............................................................................................................................Jul 18, Oct 46
Investigating the Xiegu XPA125B 100W Linear Amplifi er, Richard Constantine G3UGF .....................................Mar 10 What Next?
Lab 599 Discovery TX-500, Daimon Tilley G4USI ..............................................................................................Nov 8 Colin Redwood G6MXL.............. Jan 32, Feb 32, Mar 32, Apr 32, May 32, Jun 32, Jul 32, Aug 32, Sep 32, Oct 32, Dec 42
Morse Tutors, World of VHF
Colyn Baillie-Searle GD4EIP and Duncan Fisken G3WZD ..................................................................................Jun 54 Tim Kirby G4VXE ...........Jan 22, Feb 26, Mar 26, Apr 26, May 26, Jun 25, Jul 42, Aug 42, Sep 42, Oct 42, Nov 46, Dec 22
Practical Antenna Models, Volume 1 (book), Keith Rawlings G4MIU .................................................................Jan 42 Contest Results, Colin Redwood G6MXL ............................................................................................Feb 10, Nov 32
QCX Mini, Daimon Tilley G4USI .....................................................................................................................May 10 Contests, Colin Redwood G6MXL ......................................................................................................Jun 60, Sep 62
Order at www.radioenthusiast.co.uk/store/bookshop or call 01778 395161
July 2022 PRACTICAL WIRELESS 9
Practical
Charles Wilson M0CDD
[email protected]
The inverted-V dipole antenna is a popular
choice of antenna for portable use and
appears in many guises, some of which
allow up to five bands to be used.
Although the inverted-V is more convenient to
erect than a conventional dipole when portable,
the design and construction of the 9-band
portable (/P) antenna described is really a
compromise between portability and durability.
It is also sensitive to the method of feed.
The Antenna Design
The 9-band portable antenna uses the design
by Jim Andera WB0KRX known as the 8-band
Backpacker Special [1]. It is based on inverted-V
fan dipoles for 40m and 20m with extension
wires for other bands. The lengths of the 40m
and 20m dipoles are given in Table 1.
The dipole elements were made using seven-
strand hook-up wire and cut to the appropriate
lengths, then terminated together at the
feedpoint, Fig. 1, and terminated with insulators
on the low ends. As RF energy travels on the
outside of the conductor, the thickness of the
cable affects not merely the power handling but
also its bandwidth.
Short tails were left at the insulators on the
low ends and half an inch of insulation was
stripped back and tinned. The insulators are not
essential as nylon support twine is an excellent
insulator.
The 40m antenna will work on 15m as a three
half-waves antenna but due to the velocity
factor of the antenna wire, the SWR will be high.
Rather than use an ATU, a pair of extension
leads 18in long – one for each dipole element
An HF 9-Band
– are added to the ends of the 40m antenna
elements, which then makes a three half-waves
antenna for 15m with a satisfactory SWR.
Portable Antenna
The extra pairs of leads are added at ground
level and the basic principle of the antenna
can be seen. To use the other bands simply
consult Table 2 and add the appropriate length Charles Wilson M0CDD describes a handy portable antenna
extension pair at ground level of course.
that covers nine HF bands, 80 through 10m, including 60m.
Creating the clip-on extension pairs is
straightforward. Again, half an inch of insulation
is removed and tinned at one end and a fine tuning is valuable in case that becomes in Table 1 should give the lowest SWR in the CW
crocodile clip fitted at the other. It is important necessary from time to time, Fig. 3. portion of the band.
that the cable is securely fixed at the clip and If it is intended to use 80m, then do bear in Then configure the antenna for any of the
strain relief given, otherwise the wires will mind that the clip-on extensions are almost 33ft other bands of interest. Add the extensions as
fray and break. A small nylon tie that straps per side. Obviously, this will need to be taken shown in Table 2 and again perform the SWR
the cable to the body of the clip is ideal. It is into account when calculating the length of the checks as above. The longer the overall dipole
advantageous to use different bright coloured support twine required if tying off to a stake, legs are, the lower the SWR in the CW portion
wire for the extensions as this will help prevent when configuring the antenna for other bands. of band, while reducing the overall length of the
mistakes when band changing and reduce the Once the antenna has been erected in the elements will give a low SWR in the SSB portion
chance of extensions being left in the grass at basic 40/20m fan-dipole configuration, carry of the band. If it is necessary to increase the
the end of the day, Fig. 2. out an SWR check on both bands. Using low length, then the 6in extensions may be used or
In addition to the extensions cut from the power, sweep across each band from end to make the element lengths 6 inches longer and
dimensions of the chart, a pair 6in long for any end observing the SWR. The dimensions given then fold back to suit.
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10 PRACTICAL WIRELESS July 2022