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Radio links
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TS850 mods

These are the most useful ham-related websites I’ve found, so far ....

Quick links

  1. Clubs and societies that I belong to
  2. Radio friends with websites
  3. Ham software, DXcluster and digimodes - computers-in-ham-radio
  4. Construction and electronics including K2, K3 and QRP - constructor’s assistance
  5. QRO amplifiers, circuits and components - especially those using the GS35b
  6. Contesting and operating - tips
  7. Antennas, towers and earthing - aerial stuff
  8. Little bits at the bottom of my junk box - the leftovers

Clubs and societies

  • CDXC logo whiteCDXC is the “CHILTERN DX CLUB” for CQ contest entries, not the Clipperton DX Club! It’s a great DX club with a growing international reputation and membership. Membership also gives you access to a special members-only reflector and DXcluster.
  • ZM4T is the East Coast Contest group based near Hastings. I’m their volunteer webmaster so blame me for the rather utilitarian site design (curiously similar to this one) and lack of recent updates.
  • ZL6QH is the infamous call of the Quartz Hill contest group based on Quartz Hill just outside Wellington city. This was a fabulous radio QTH, a former government receiving site on a windswept hilltop, so windy in fact that it was turned into a wind farm. While the new site owners were willing to share, it turned out that the switch-mode units converting low voltages from the generators up to the high voltages needed on the grid caused so much radio QRM that the site was no longer suitable for DXing or contesting. Cunning plans to relocate the group to other sites in the greater Wellington region didn’t come to pass, so that’s it for ZL6QH, sadly, the end of an era.
  • ZLCC (ZL Century Club) is an invitation-only email reflector for active Kiwi DXers. If you are a Kiwi DXer, email me for an invitation or apply to join through Google Groups.
  • M6T (Martlesham DX and Contest Group) is the UK’s premier HF contest group and a great bunch of contest nuts. The club is QRV from a permanent QTH thanks to the generosity of Bob G4BAH (SK).
  • The Voodoo Contest Group used to activate different rare West African countries in CQ WW CW every year. Members still contest and sometimes travel but not usually to West Africa.
  • RSGB logoRSGB - The Radio Society of Great Britain is the UK's national radio society. The site carries weekly-updated news (including DXpeditions), propagation info , contest info etc. including the text of the Sunday news bulletins. And the RSGB publishes some of the best Amateur Radio books and maps available, including the definitive callsign/prefix guide edited by my pal Fred G4BWP. The monthly Radio Communication magazine carries RSGB contest rules and results, Pat Hawker’s excellent Technical Topics scrapbook and a bunch of other trivia. Oh and the RSGB HF Contest Guide I wrote a long time ago on behalf of the HF Contests Committee.
  • ARRL - Amateur Radio Relay League - the American national amateur radio society. After a few years in the wilderness I rejoined in order to get QST and a discount on my DXCC applications. The ARRL’s books are recommended.
  • The G-QRP-Club’s construction articles and operating tips in the club mag Sprat are well worth the QRP subscription. I always do my level best to hear and work QRP including those who sign /QRP, where it’s legal to do so, otherwise those who just send [space] QRP, or the modest ones who choose not to disclose their lack of power.
  • Sutton and Cheam Radio Society gave me a start in ham radio back in the 70’s, welcoming this schoolboy with open arms into the club meetings at S utton C ollege O f L iberal A rts (annexed to Sutton’s superb public library) and field days at Tadworth and Leek. Andy G4ADM , Mike G3LCH, Colin G4CWH, Mich G8DF (“golf eight dog fox”!) and other radio friends from that era are permanently etched into my brain - a fantastic bunch. Tnx!
  • Leicester Radio Society continued my amateur radio education when I was at uni in Leicester in the mid-80’s. Thanks to the generosity of his family, I was partly responsible for securing the late Jack Hum’s famous callsign G5UM for the club - one of the earliest “contest calls” in the UK I guess, and a neat way to pay tribute to a great man. Jack was a VHF pioneer, way back in the day when ‘short waves’ were generally considered worthless. Oh how things have changed!

Back to quick links

Radio friends

  • Hot one Michael G7VJR provides Club Log, an excellent facility for DXers to upload and analyze their ADIF logs. It tells you which and how many DXCC countries and CQ zones you have worked and/or confirmed per band, your league position relative to other Club Log uClublog logo 125sers, when are the best times to work the DX, that kind of thing. A huge amount of painstaking work goes into defining the rules to identify DXCC countries from ADIF logs submitted, and to resolve all maner of curious anomalies over the years and I’ve certainly appreciated finding errors in Logger32’s output (thanks to Alan 5B4AHJ, Dave G3NKC and Michael G7VJR). Michael is also CDXC’s webmaster and a keen DXer and accomplished DXpeditioner himself.
  • OE3TXF - Nigel is a well known DXer, avid QSLer and QSL collector, tireless QSL manager, oh and UFB CW DXpeditioner. Nigel’s website has searchable logs plus lots of radio photos from his DXpeditions and other jaunts. Nigel always uploads his logs promptly to LoTW giving out numerous “firsts”. His hearing and operating skills are legendary - such a gentleman.
  • G0AFH - Ian is a pal from M6T and Windmill CG ... and a superb photographer.
  • G0MTN - Lee also belongs to M6T and the Voodudes. His site has some great pictures of the West African hotel roof style typical Voodude set-ups.

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Ham software, DXcluster & digimodes

  • ARGO may be the software that almost everyone recommends for QRSS, but for various reasons the open-source program QRSS VD by AJ4VD suits me better.
  • Puzzled about a weird data signal you hear on 30m? Well try looking up its frequency on this cool 30m band plan for a clue as to what it might be, and compare its sound against samples on sites such as this. While MMVARI does a decent job for RTTY and PSK, I’m interested in software to decode the more exotic ones - MultiPSK by F6CTE perhaps or something else from Utility Monitoring Central’s software links page
  • If you suffer QRM from your computer gear, routers, TVs, toasters etc., read all you ever wanted to know (and then some) on RFI and how to cure it thanks to K9YC.
  • VE7CC’s cluster user software is neat: set up a local cluster on your PC with flexible filtering, LoTW indication and useful other options. Read more here.
  • VE3NEA writes wonderful ham software, some of which is free of charge. The DXatlas program lets the user draw beautiful high-resolution colour maps complete with overlays for CQ zones, country outlines, latitude & longitude or Maidenhead locator grid lines, capital cities, DXCC prefixes, grey lines, propagation prediction (with the associated IonoProbe program) and so on - pretty much anything a serious DXer could ever want from a map program. Mercator projection or great circle projections are no longer confined to the shack wall: the software allows the user to interact with the maps. The globe projection is great for those of us who don’t have the desk estate for an actual globe. Morse Runner is an excellent free program for practicing CW pileups and contests. The sound output is significantly better than those old fashioned CW practise programs - it includes realistic QRN QRM and all the usual crud you experience on a hot and busy shortwave band - including lids who CQ on “your” frequency. Real-time feedback on the accuracy of your log as each QSO is committed to the record is great for improving your contest logging techniques. Its nearly as much fun as a real contest. Get it now, while it’s still freeware!
  • Find out who else is using LoTW at HB9BZA’s site. HB9BZA also provides RXCLUS software to integrate DXcluster spots from various sources (something VE7CC’s Cluster User software also does). SpotCollector is another package in the same vein.

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Construction & electronics inc. K2, K3, QRP & SDR

  • A page of info on fixing the Astron power supplies includes links to useful sites on LV power supply design.
  • N7JS wrote about constructing a neat little beacon-in-a-box using the Freakin Beacon memory keyer and Jittle Joe QRP TX. Good job!
  • Step-by-step instructions for making a transformer.
  • Lots of info on SDR from G4ZFQ, with many annotated links to the original sources.
  • Hot one Helpful list of Elecraft and user K2 mods maintained by LA3ZA, including those to bring older K2s up to current specs.
  • Vinyl lettering, cheap.
  • Here’s a novel way to solder PL259s with screw-in reducers to RG58 or RG8X cable.
  • Peak hold meter adapter is useful for tuning amps while transmitting CW or SSB normally using a peak-reading power meter.
  • I’ve used old Post Office straight Morse keys and homebrew paddles made from junk box parts including hacksaw blades and PCB strips in the past but for at least a decade I’ve been very happy with my Bencher paddle. Happy, that is, until I spied the Begali Sculpture, a beautiful piece of modern engineering art in the shape of a Morse paddle. I yearn for one. I’d probably sell a kidney for one. I’ll definitely have to save hard for one.
  • I stumbled across XQ2FOD Manfred’s website in connection with constructing quiet switch -mode supplies but his photo-essay on constructing a home in the middle of nowhere, powered by a water turbine fed from a mountain stream, is even more fascinating.
  • A Vector Network Analyser by N2PK looks like a useful tool for measuring antennas, tuners etc. - though my MFJ 259 box-o-trix works pretty well too.
  • Lots of construction articles from AD5X.
  • The SteppIR looks attractive for full coverage of all the high bands but reliability of the mechanism is a concern. Log periodics have less gain for the size but no moving parts.
  • Kicad is an open source/freeware electronics CAD system for drawing schematics and PCB designs. It doesn’t do circuit analysis but others do ... I’m still looking.
  • EasyEDA is an online circuit and PCB design tool: do it all in your browser.
  • Elecraft - designers, suppliers and supporters of the K1, K2 and K3, and other neat little kits. The guys behind Elecraft provide a wonderful after-care service as well as producing several of the finest radios ever made.

Back to quick links

GS35b/QRO HF amplifiers, circuits and components

Here’s a heap of amp construction links courtesy of a ZL QRO linear constructor, supplemented by hints from the great bunch of guys on and links from other sites:

Back to quick links

Contesting & operating

  • DX CoC logo new 100Hot one We should all read and comply with the DX Code of Conduct, plus the IARU Guide to Ethics and Operating Procedures for the Radio Amateur. Help us spread the word to address poor operating standards and selfish behaviours, and clean up the pileups. Join the movement: link to the code from your website or QRZ page.
  • Keep up with current and planned DXpeditions with this list maintained for the uber-cool DailyDX by Bernie, W2UR.
  • WA7BNM, Bruce, maintains the ultimate annual HF contest calendar with info on all the major contests of the year, and a few more minor ones.
  • Sun.exe puts a little sun in the corner of your desktop: hover your mouse over it to see the sunrise and sunset times today. Alternatively, calculate SR/SS times for the whole month, print out the calendar sheet and you have no excuses for missing those greylines.
  • Find out a little about the mega-stations you seem to work in every contest in this database, and think about the immense dedication it takes to keep all that aluminium in the air and watts on the wire.
  • Fly through cool 4D images of the ionosphere courtesy of NASA plus Google Earth.
  • Logbook of The World (LoTW) is the ARRL’s solution for electronic QSLing. To use LoTW, you first need to apply for a digital certificate which authenticates you as a legitimate licensee. Then you digitally sign your log using the certificate and upload it to the LoTW server (I upload my own log, or rather QSOs added since the previous upload, every few weeks). The LoTW database then cross-matches QSOs between you and any of the ~24,000 other LoTW users and generates electronic confirmations that are accepted for DXCC credit.
  • SM3CER website has the best and most up-to-date contest diary plus lots of links. An excellent resource for contesters!
  • has contest tips and links e.g. to the 3830 reflector for bragging about your claimed scores.
  • CQ World Wide is CQ Magazine’s official website for the biggest event in the contest calendar. CQ Magazine’s website is separate.
  • NG3K’s DX and contesting site - an excellent set of useful resources for contesters.
  • HF beacon list - constantly maintained by G3USF.
  • Michael G7VJR has implemented annual DXer leagues in Clublog. CQ Magazine’s DX Marathon is a similar concept except that it is mixed mode and only gives credit for the first QSO with each CQ country and CQ zone in the year regardless of band. Finally, ARRL’s DXCC Challenge rewards QSOs with DXCC countries on each band but is forever, not annual.
  • is a fast log search engine with a growing collection of DX station logs. In the best amateur radio tradition, it is free to use. I’m pleased to see big DXpeditions allowing near -real-time log searches - it cuts down on the need for additional ‘insurance’ QSOs and hence allows more of us to work the DX. Most big DXpeditions lately have appeared on Clublog.

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Antennas, towers, feeders & earthing

  • VDA - Vertical Dipole Array - is an effective, lightweight 2 element vertical HF beam design for DXpeditions located right by the sea at the high water mark. The saltwater ground plane is essential. While F4BKV’s design brings the cords holding the lower ends of the wire elements in to the support pole, it occurs to me that if they were allowed to hang vertically from the cross-arm (fixed to pebbles on the beach), the spacing and hence the pattern should be even better. To be honest, a plain vertical does pretty well and I’m not entirely convinced of the value of a 2 element close-spaced array. The sharp rear null may be a drawback as much as a benefit.
  • Here’s a creative way of using a tape measure to make a poor-man’s Steppir vertical. A simple manual version would make a very useful, lightweight multiband vertical for use on a seaside DXpedition with access to a handy palm tree or bamboo cane for support.
  • Broadband amplified mini receive antenna by PA0RDT. I will be building one of these as a diversity receive antenna for the K3, and another for my Funcube Dongle Pro+ SDR.
  • If that doesn’t go to plan, a homebrew wideband HF vertical design by Martin G8JNJ looks good for 40m and up, possibly even 80m as well. With the broadband matching unit Martin specifies, the SWR levels-out at about 3:1 across the range - not much good for transmission but fine on receive and anyway I already have well-matched transmitting antennas.
  • Here’s a novel use for a matching pair of heatsinks: a homebrew HV tuning capacitor for a QRO ATU.
  • The VP6DX gang went to loads of trouble to plan and engineer a superb receiving antenna setup for their DXpedition, and best of all published the nitty-gritty details on their website including bandpass filters designed to allow multiple receivers to share the same Beverages on different bands at the same time.
  • I’d love to build a decent spud gun to get my wire antennas over the tall trees on our boundary, and get some wires high up in the forest canopy. To do that, I need to find a suitable trigger valve ... such as those sold in W6 land.
  • Instructions for calibrating the MFJ259 antenna analyser by W8JI, one of the original product designers. [Mine appears to works fine without calibration but what do I know?]
  • A YCCC article about using common mode chokes to block QRM from miscellanous QRM generators around the house mentions the Fair-Rite site for technical info on toroids and Lodestone Pacific as a cheap source for them (provided you already know exactly what you want).
  • An interesting idea for DXpedition masts comes from W0BNY who has constructed a mast to support a lightweight hexbeam using an extension ladder. Ladders should be available almost anywhere there are builders ...
  • Walter Maxwell W2DU knows far more about antenna matching than I’ll ever know, and writes very well about things such as why SWR up to about 5 on coax is not A Terrible Thing, but common mode current on the coax shield is. Well worth reading.
  • VK5BR designed a “single coil” ATU for balanced or unbalanced antennas on 80-10m, and then extended the design to include 160m and then a QRO version. The “single coil” is actually three fixed coils - no plug-ins.
  • Construction details for 2-wire Beverages from W0BTU includes a pulley arrangement to tension both wires equally: I’m planning to use something similar for the centre feedpoint of my vee-beam array when I eventually get around to putting it up. Here are loads more notes on Beverages including BOGs.
  • Antenna modelling on 160m Beverage antennas by W8WWV.
  • N6LF’s interesting experiments with verticals and radials.
  • G4VGO likes hoisting 160m wire antennas on kites and balloons.
  • LY4A’s site carries DX news including photos of some impressive antennas.
  • Info from a supplier on various conductive pastes for antenna and tower joints, plus an earth salting pipe to keep the ground conductive ‘even in a drought’ (they say). [I have a friend who discovered how conductive his urine really is by peeing on an electric fence. It made his eyes water :-) ]
  • W7IUV’s experimental work on 40m 4-squares draws the conclusion that a simple ‘parasitic’ phasing unit with 4 relays works almost as well as a more complicated tuned phaser. He also says that a 40m 4-sq is easy to match on to 30m with a fifth relay and matching blob, and that the element spacing is not critical but using buried radials is. “A four element version spaced at 0.21 wavelength was consistently 6-8 dB better that the two element yagi at 80 feet”. Nice!
  • The Granta contest group, based near Cambridge in G-land, has been busy building contest equipment including an innovative bayonet fitting for temporary antennas (e.g. for use on DXpeditions). My school mentor Colin, G4CWH, is one of the members.
  • Ham porn - ’nuff said
  • Read far more than you ever wanted to know about earthing for lightning protection and RF purposes in a large US DOD manual (contains parts 1 and 2 in the same file).
  • A bunch of links of interest to those building hilltop VHF/UHF repeaters or antenna farms at home.

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Little leftover bits at the bottom of my junk box ...

  • I am astounded to find that if I draw a great circle line to any DX station I contact, a second great circle line to Stonehenge, and a third great circle line between the DX and Stonehenge, those three lines always form a triangle . Spooky! I call this the Principle of Sacred DXing, no doubt long since discovered by the ancients using Magic Crystal Sets.
  • Use a tin-foil hat when speaking on your cellphone.
  • To understand various complicated engineering terms, read this.

Add URL: please let me know of other good amateur radio sites and do tell me if you link to this site - I will happily reciprocate!!

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Hawke’s Bay
North Island
New Zealand

39o 39’ South x 176o 37’ East

Locator RF80HL

260m ASL


CQ zone 32

ITU zone 60

A1 Ops

DX CoC logo new 125 on black
Clublog logo 125
G QRP Club

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Please email me for permission to republish.