GB75UW was a special event station celebrating the 75th anniversary of the Cambridge University Wireless Society’s callsign, G6UW. Between 1 December 2007 and 28 December 2007, a total of 1,700 QSOs were made. If you need to QSL, please bear in mind that all QSOs will automatically receive a QSL card. For direct QSLs, please route to G7VJR (see

The Cambridge University Wireless Society was founded in 1920 and its original members included Professor Sir Ernest Rutherford (now known for his work on nuclear physics but originally a radio researcher) and Professor EV Appleton (known for his discovery of ionospheric layers, made while he was a CUWS member). Other members have included Dr J.A. Ratcliffe (ionospheric researcher), Professor Sir Maurice Wilkes G5VF (ionospheric researcher and builder of EDSAC, the first practical stored program computer), Dr JB Gunn (inventor of the Gunn Diode), and Professor Sir Martin Ryle G3CY (Astronomer Royal and inventor of aperture synthesis radio astronomy techniques). Professors Rutherford, Appleton and Ryle are all Nobel Prize winners.

CUWS members made substantial contributions to the development of radar and other key technologies during World War 2 and have since played many leading roles in British industry and academia. Cross fertilisation of ideas in the British scientific establishment is evidenced by Professor Ryle’s citing of Professor Wilkes’s contribution to the use of computing in radio-astronomy in Cambridge.

CUWS is one of the last university amateur radio clubs active on a regular basis in the United Kingdom, and is a source of practical training for the RCF/Ofcom radio exams for university members and the public, as well as an active HF DX and contest club.

Les Minquiers (GH): 2007


Cambridge University Wireless Society (CUWS) regularly undertakes short IOTA or SOTA expeditions, and, normally once per year, operates from somewhere in northern Europe. Recent activities have included Iceland (2005), The Faroes (2006) and Svalbard (2007).

2007 is our 75th year on the air, and has been particularly busy, with IOTA trips to St Kilda, and most recently to Les Minquiers (The Minkies) in the Channel Islands, near Jersey.

Location and History

The Minkies (EU-99) are a large collection of rocks approximately 10 miles south of Jersey (QRA IN88xx); they are part of a reef, which can be seen on clear days at low tide from the southern coast of Jersey. However, Jersey has some of the largest tidal ranges in the world, and only a few of the rocks are permanently above the sea line.

The most significant island is Maîtresse, which is about 50m long and 20m wide. It is steeped in history and has an assortment of around ten stone cottages in various states of repair, including the most southerly toilet in Britain (often the subject of QSL cards in the past – see There is no power or running water, but there is mobile telephone reception.

Following a long-running (but friendly) dispute between Britain and France, the reef, along with the nearby Ecrehous, was awarded to Jersey by the International Court of Justice in 1953. They made the news headlines again in 1998 when there was a French ‘invasion’, which lasted one day.

The Minkies are close to both France and Jersey, but the waters around them are treacherous, and most mariners avoid the entire area, following an extensive network of buoys to avoid the possibility of running aground on the rocks. It is this difficulty of access which makes EU-099 an enigmatic and attractive target for radio expeditions.

CUWS Expedition

Our visit to the Minkies (IOTA EU-099) took place between 3 – 5 September, 2007. We were pleased to use the unusual Jersey club prefix, giving us the callsign GH6UW. The team consisted of alumni: Martin G3ZAY, Dominic M0BLF, Tim M0TDG and Michael G7VJR.

Early discussions in April 2007 with Jersey contacts revealed that visiting the Minkies would not be possible without a degree of support from the local harbour in St Helier. A previous radio expedition had run into difficulties during the IOTA contest in 2004, and as a result there was some reluctance to conduct another radio trip without additional reassurances and planning. Indeed, our initial request to go to the Minkies was declined immediately.

For CUWS, any expedition comes with the additional responsibility of representing an internationally recognised University. In this case, we felt it was best to persevere. Further correspondence followed, and our plans were eventually accepted, having now explained our approach and willingness to treat the islands with care. This, however, was not all.

We were delighted to now receive an offer of transportation to the Minkies from the Jersey coast guard, and use of the Jersey States building on Maîtresse. Suggested times to make good use of the tides and advice on the trip were also given to us. This additional help gave us a great head start; we would have a roof over our head and would be able to avoid using an expensive chartered boat, and side-step some obvious problems with the benefit of local knowledge.

Getting There

We flew into Jersey cheaply, but this gave us an added problem of carrying only what our hold baggage could contain. When it comes to radio equipment, power supplies and linears are never light enough.

After hiring a car, there was just enough time to shop for provisions, obtain water and fuel and a Honda generator on Jersey. As the tidal waters dictated our departure time around 1pm on Monday 3 September, we were sure to double check that we had everything we would need to be fully ready for departure. A frantic morning!

After ferrying our equipment down to the Albert Quay in St Helier, we were amazed to be invited aboard the Duke of Normandy, a 500 tonne vessel which is normally in full-time use manoeuvring cargo ships and the like. Our kit was loaded onboard and we departed, in perfect summer conditions. GPS maps and sonar equipment showed our progress into ever more complex shipping lanes around the Minkies. When we reached Maîtresse (about 1 hour later), we transferred to a smaller craft that had been towed by the Duke Of Normandy, and disembarked onto the shores of the island.

Arriving is a special moment on any expedition. The weather was perfect as we came ashore. I will not forget the clear, shallow waters and the wonderful weather that graced our entire trip to the Minkies – we were treated to beautiful sunrises and sunsets, and luxurious summer weather. My fears of having to abandon our trip due to poor weather (remember it flooded in July!) were unfounded.

Although rocky, Maîtresse and the outlying rocks are charismatic and charming, and to be able to swim in the sea was the ultimate refreshment.

On the air

As we carried our equipment to the top of the slip way and onto dry land, our priorities quickly turned to commencing our radio activities. We had just 48 hours to make as many contacts as possible.

We were soon able to erect a 20m vertical antenna on top of the highest point, using a 10m SOTA pole. 9 elevated radials were used. The rig was an Icom 706 with 300W (using an inexpensive RM500 AM/SSB linear). Dominic M0BLF began CQing on 20m SSB, logging to WinTest in DXpedition mode. A pile up was quickly underway and Dominic reached a rate of 180 Qs/hr.

We were keen to put two stations on the air, and had brought a range of 100W Dunestar band-pass filters. The next station to go on the air was for 30M CW, which we judged would be a good, long-haul band which would benefit from our 360 degree salt water take off. Using an Elecraft K2/100 (completed just days before the expedition and barely tested), Michael G7VJR began operating on 10MHz using a lead acid battery outside. Within 15 minutes or so, GH6UW was split and listening up around 2kHz. The DXCluster had, presumably, started to draw attention to our activities.

With no mutual interference, we were delighted to be putting out a solid signal on phone and CW simultaneously. The logs continued to fill, and as evening quickly arrived we began to receive more and more attention on the bands. Pile-ups became raucous and sustained, and we were soon working friends in the States and Japan, although Europe was giving us good rates and we felt it best to take all callers.

With time now less of an issue, Martin and Tim had arranged meals and tidied up to remove dust and grime from the buildings where we were lodging. Martin soon had dinner sorted, and Tim was able to take care of the generator, and take over on the 30M station. Incidentally, the Honda EU10 1KW generator was quiet, reliable, portable and efficient – it consumed only half the fuel we expected.

Our operation continued during the night on CW, with Tim and Dom putting in the hours, and come morning we commenced SSB operations again. We were now ready to try 40M SSB, so a third antenna was erected to support our 40M dipole. With this extra choice we had a better chance of working EU during the day, and we would be ready for the DX later.

We were disappointed that 40M did not give us much access to ‘G’, although we did appreciate the perseverance of those stations who were able to break the EU wall and work us, including club members back in Cambridge, Christian M0SCH and Christian M0TBF. Stations in GU and GJ were super-strong so we were delighted to add some locals to the log, too.

Other than a brief (< 100 QSOs) spell on 17M, we were content to use 20M, 30M and 40M. Although an 80M dipole was constructed, we dismantled it for practical reasons – given the choice, we favoured 20M and hoped for more DX. We were fortunate indeed (SFI 66) to work many JA stations. Of particular note, though, were ZL1BYZ, VK4BUI and VP8NO who were able to work us on CW – a wonderful surprise.

These days, even a small operation will suffer some deliberate QRM, and so it turned out to be for us, too. We were disgracefully jammed on 20M and 40M in particular, and had to avoid split operations on 40M as this seemed to reduce the problem somewhat.

While not operating, I might add that we were able to enjoy Mediterranean conditions on Maîtresse. Swimming, photography and sleeping were popular past times while not operating on the radio. Our stay was also livened up by a few visits by passing yachts and even an ex-military French telegrapher, who was overjoyed to see us using morse code. We also met two contemporary dance students who were staying in one of the other huts, and were kind enough to tolerate our intrusion (before our departure, spare food and supplies were transferred to them).

On Wednesday 5th September, we were picked up by the Pilot boat from Jersey Harbours and returned to St Helier, a little sunburned, but very happy to have made our mark on HF and given EU-099 a fresh airing.

We spent a few more days on Jersey, staying at the Jersey YHA near St Martin (in its own right, a perfect HF location on a cliff top with spacious grounds). While there we met GJ7DNI by chance, having spotted a Versa tower passing by on his trailer. By Friday, we were unable to resist a visit to the Jersey Beer Festival in St Helier, before flying back to England the next day.

QSO Statistics

We made a total of 3654 QSOs in just under 48 hours. This was split as shown in the table below:

Band: SSB: CW: Total QSOs As %
40m 951 (51.2%) 906 (48.7%) 1857 50.8%
30m 0 (0%) 693 (100%) 693 18.9%
20m 800 (78.1%) 224 (21.8%) 1024 28.0%
17m 0 (0%) 80 (100%) 80 0.02%
Totals: 1751 (47.9%) 1903 (52.1%) 3654 100%

There are 3083 unique callsigns in the log. 5 people contacted us on four bands, 51 on three bands.

Top five countries: USA (18.0%), Germany (15.0%), European Italy (7.6%), England (6.1%) and European Russia (5.6%).

A total of 86 countries were contacted.

Breakdown by continent: EU (76.7%), NA (19.5%), AS (2.2%), AF (0.7%), SA (0.7%), OC (0.1%).

Online resources

We have a number of online resources related to this trip, as follows:

Expedition summary:

Online log search:

Expedition video:


Lastly, our QSL manager is Dominic M0BLF. The above links are all included on his page, at the top of the list of URLs above.


We are indebted to Jersey Harbours, in particular to Peter Lawrence and Ian Lamy, whose advice alone before the trip was invaluable.

We were fortunate and immensely grateful to also have their help in providing transport and access to the States building on this trip. Their generosity exceeded anything we could have expected – it made such a difference. Thank you again, from all of us at Cambridge University Wireless Society, for dedicating so much of your time to supporting us. It cannot be overstated how much we appreciated your help.

DXCC League Table

This is a new feature for the website designed to encourage a little competition between members and to see how people are doing chasing new countries.

The figures given are worked totals as peoples’ confirmed totals often depend quite greatly on how long they have been active and how much has been invested in direct QSLing. Unless otherwise stated, these figures were correct as of 20th January 2007.

Anyone else wishing to be included in the table, please e-mail me your totals and I will include them. I will publish new totals every three months or so depending on interest and activity.

10m 58 114 43
12m 19 22 28
15m 118 145 153
17m 71 37 85
20m 189 128 157
30m 39 3 8
40m 136 70 83
80m 43 52 43
160m 5 1 18
Challenge 718 575 621
Phone 214 202
CW 109 169
Digital 3 23
Mixed 233 226 234

*G7VJR’s logging program does not provide individual mode totals.


For some years now, whilst CUWS has been regularly fielding teams for the major phone contests in the amateur radio contesting calendar, there has been little representation in CW contests. This is regarded as a shame by some but it also gives an opportunity to those who are active on the CW parts of the bands to use the G6UW shack both for some contesting practice and to give their own callsigns a QRO airing and to try and nab a few new ones for their country totals.

CQWW CW is generally regarded as the biggest CW contest of the year and there are many expeditions to rare and semi-rare countries all over the world. Often, these expeditions involve taking large antennas and amplifiers to these countries making them easy pickings when combined with G6UW’s large antennas. After some negotiations with other CUWS members keen to have a go in the 2006 contest, it was decided that I should have the Saturday to work what I could.

The original intention had been to travel up on the Friday night and be ready for the start of the contest. It became clear in the week leading up to the contest that this would not be feasible as work committments meant that an arrival in Cambridge would not be possible before 2100 and an 80m antenna would have to be set up in the dark as there is no permanent one currently at the shack. Taking this into account, I decided that it was best to get a good night’s sleep at home on the Friday then head up the next morning. Waking the next morning, I discovered that there was a serious accident on the route to Cambridge I normally use. I waited a little for this to clear then headed north.

The shack is pretty well set up for getting on the air with win-test and the rig interfaces permanently ready. In addition to this, I had use of a microham microkeyer to provide keying from the keyboard.

As time was short and the main aim was to expand my DXCC totals, I decided to go for Single-Op All Band Assisted High Power so that I could use the packet to sniff out the juicier stations. Things started off well with lots of DX audible even though winds forced me to keep the tower wound down. However, within 20 minutes of starting, a squally shower swept through accompanied by thunder and lighting. The only thing to do was to unplug everything in the shack and power down until the storm had passed. This took a good 40 minutes and there were several lightning strikes in the fields surrounding the shack. Once the lightning had passed, things were back up and running again quickly. Conditions were reasonable for the most part and 15m was open to the US and other parts of the world. The best DX worked on 15m was VK9AA for an all time new country at around 1330z. Small runs were possible to the states at times but these did not sustain for very long and the band opened and closed several times. There were also problems with the microkeyer at times which meant some of the keying had to be sent manually. The problem was eventually traced to RF getting into the USB lead from the PC to the microham and a well wrapped ferrite ring seemed to cure this.

In the end, I didn’t operate too long after sunset due to other things coming up and the final totals were as follows:

Band QSOs DXCC Zones points
10m 5 5 3 11
15m 55 43 19 136
20m 53 50 20 114
40m 26 26 8 36
80m 0 0 0 0
160m 0 0 0 0
Total 139 124 50 51678

For only a few hours work, this seemed reasonably successful with a reasonable score and a total of 82 unique DXCC worked which included 7 all time new entities and numerous new band/countries worked. Others also reported successes in the contest with good conditions on the higher bands (although sadly there was not much on 10m).

There is an increasing interest in CW among the active members who join our contest entries and hopefully, it will not be too long until we can mount a major multi-op entry into a big CW contest again.


Article by Dominic Smith, M0BLF, edited by Thomas Wootten, M0FFX.

I participated in the CQWW DX SSB Contest from the Cambridge University Wireless Society, using our contest callsign M4A.

A short audio clip (1m37s) of me running on 20m at about 1220UTC on Sunday can be heard here (RealAudio format) or here (MP3 format).


Contest CQ World Wide DX Contest
Callsign M4A
Category Multi Operator – Single Transmitter (MS)
Overlay —-
Band(s) All bands (AB)
Class High Power (HP)
Zone/State/… 14
Locator JO02AF
Operating time 41h13
160 73 0 40 6 78 1.07
80 281 0 61 12 331 1.18
40 396 0 85 23 797 2.01
20 980 8 118 35 1845 1.88
15 591 0 113 31 1004 1.70
10 189 2 53 16 247 1.31
TOTAL 2510 10 470 123 4302 1.71
TOTAL SCORE 2 551 086


Soapbox: A very fun contest entry with a large team made up almost entirely of current students or recent graduates of Cambridge University. We had our fair share of problems, such as melting two baluns during the weekend, which left us with 80m for much of Sunday evening, and we also had only one 14/21/28MHz antenna, so the mult station could not use these bands while the run station was on one of them. Nevertheless, we improved on our score from last year and felt that conditions weren’t as bad as they might have been. More information at


Run station: FT-1000MP, Quadra, Dunestar filters.

Mult station: FT-2000, TL-922, Dunestar filters.

Antennas: 160m dipole, 80m phased array, 80m dipole, 40m four-square, 40m rotating dipole, Stepp-IR.

The antennas were shared between the run and mult stations. This means, of course, that while the run station was on 20m, 15m or 10m, we could not use the mult station on any other of these bands (except if we forced the 40m rotating dipole onto 21MHz).

Logging was with Win-Test, which worked very well except for a small bug in the communication with the FT-2000 (hardly surprising given how new the rig is).

Some pictures of the set-up are at

Highs and lows

Good points were beating last year’s score and taking the opportunity to introduce many students to contesting for the first time.

Low points included melting two baluns, which meant that we couldn’t use 80m for the last four hours on Sunday; getting the mobile tower stuck and not having sufficient antennas for a full mult station.

Band breakdown

(QSO totals below include dupes)

Band QSO % Time % QSO/min.
160 73 3 79 4 0.924
80 281 11 273 13 1.030
40 396 16 409 19 0.968
20 988 39 855 39 1.160
15 591 23 411 19 1.440
10 191 8 149 7 1.280
Total 2520 100 2176 100 0.877


There were 1970 unique calls in the log, of which 2 were worked on all bands, 8 on five bands, 24 on four bands and 82 on three bands.


There were 76 minutes during which we sustained a rate of four QSOs/minute or higher (individual minutes, not one 76 min period!). On average, we made about 1.02 QSOs/minute during the 41h13min on-time.

The hourly contacts per hour rates were:

Date UTC Rate
28/10 0000 59
0100 83
0200 122
0300 66
0400 30
0500 18
0600 29
0700 40
0800 94
0900 55
1000 57
1100 55
1200 118
1300 72
1400 85
1500 124
1600 74
1700 94
1800 99
1900 32
2000 28
2100 30
2200 54
2300 26
29/10 0000 10
0100 8
0200 15
0300 16
0400 9
0500 23
0600 12
0700 24
0800 31
0900 61
1000 101
1100 85
1200 95
1300 127
1400 35
1500 74
1600 30
1700 34
1800 57
1900 63
2000 21
2100 15
2200 12
2300 18

Thanks to everyone who contacted us!

Dominic’s site can be found at

Statistics on this page created by

SH5 v1.18 (25 June 2006)


M0BBB and M0TDG were portable around Cambridge for this one while G3ZAY and newly licenced M0TJH manned G6UW for our first full 3 station entry into the this competition for 3 years. Local QRN hampered our efforts somewhat and antenna and transceiver problems led to M0BBB only being able to operate for some of the time. M0TDG was operating from the terrace of his College’s sports ground in what became sub-zero temperatures by the end and this reduced his rate (as well as his ability to type or speak) by the end.

Scores were as follows:

Callsign QSOs Points claimed Points after checking Position
G6UW 293 2930 2890 =10th
M0TDG/P 227 2270 2210 =31st
M0BBB/P 153 1530 1460 =80th
Total 673 6730 6560 9th

The final results put us in 9th place overall which was quite pleasing as we could still improve on our score by a lot provided we sort out the equipment problems and we weren’t too far off the 6th place score. A top 5 score could well be possible if we can muster 3 stations again next year.

The complete results listings are available at: