Antenna Survey @DL2LSM

The standard antenna setup @DL2LSM consists of:

  • a three band spider beam at a height of about 13m, and
  • a 2-by-20m dipole fed by a symmetrical antenna tuner AT-502 at about 12m.

The ground conditions are pretty good with ground water close to the soil. In principle the antenna setup is rather small. Nevertheless, it works amazingly well and allowed for some nice contest scores, e.g. the actual World Record of the Single Operator Assisted QRP category of the CQ WWDX contest. Additionally, a couple of different temporary antennas have been used, e.g. 40m delta loop, 2-by-27m double zepp, 80m wire pyramid, and 80m horizontal quad loop. None of these antennas — although often praised as killer antennas with gain several S units above a dipole — has been really convincing. In order to put the practical observation into perspective a numerical analysis with the 4NEC2 package has been performed. The results are presented in the following.

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VA6AM Triplexer

P1130798_smallIn order to use the spiderbeam @DL2LSM in parallel on several bands I’ve been looking for a triplexer. Looking at several approaches both commercially as well as homemade, I stumbled across the work of Pavel, VA6AM. He has been developing a triplexer with respectable performance numbers. Additionally, he provides printed circuit boards, parts, as well as entire triplexers. I opted for a full assembled board. It arrived in good conditions. DL2LSM did his usual mechanical magic to mount it in a suitable enclosure.

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CQ WWDX CW 2015 Results

Accuracy Pays Off

DM2M_CQWW_2015_CW_certificateIt has been a real surprise to me having a look at the results of the CQ WWDX CW contest 2015. The claimed scores put me in second place with Karel, OK2FD, leading the pack by a clear margin. However, he lost more than 6 percent of his score during the process of log checking. In contrast my result got reduced by only 2.4 percent. When the dust settled the difference between the two of us is less than a single DX or two inner European QSOs. Luckily – at least for me – the initial ranking got reversed. So, giving me my  second consecutive win in this contest.

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CQ WWDX CW 2014 Plaque

Eventually

IMG_5276_smallIt took some time but eventually it arrived. My plaque won in the CQ WWDX CW 2014 has been delivered yesterday. So, I have to find a reasonable place now for display 🙂

CQ WW DX SSB 2015 Result

Another Plaque

DK3WE_CQWW_2015_SSB_certificateThe results of the CQ WW DX SSB 2015 are published in this CQ magazine article. I win another Plaque (All Band QRP Europe) by finishing second place behind VE3VN. A total of 115 QSOs and 58 multis could not compensate for the higher QSO point value operating from North America. Nevertheless, that is great news taking into account that I operated without my voice being seriously ill that weekend.

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u2R Upgrade

My u2R from microHam has been working flawlessly for a couple of contests now. Unfortunately, it is recommended to be operated from an isolated power supply in order to prevent ground loops. I have been using some bricolage solution for a while now. It is not clear why there is no solution originally directly on the board.

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CQ WPX SSB 2016

Loosing the Mood

IMG_5264_smallOperating SSB during times of low solar activity is not much fun. However, I took the challenge again and eventually lost the mood to go on to the bitter end.

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IARU HF World Championship Results

The Thousand Stands

The results of the IARU HF World Championship 2015 have been published by the ARRL. I’m World Champion in the new Single Operator Unlimited QRP class. Read the rest of this entry »

CQ WWDX CW 2015

It’s going down

P1130783_smallDeclining conditions on the high bands due to the solar cycle have the effect of DX signal levels becoming weaker and openings becoming shorter in general. Thus, operating QRP becomes harder in two ways. The time window to work a certain DX station becomes shorter, i.e. there is more competition from high power stations. Additionally, less bands will be open and stations will concentrate on the ones open. Thus, increasing the competition even further. The result is supposedly much less DX stations and multipliers worked.

So, exactly this happened over the weekend. The final result — 1.7 compared to 2.4 million points last — is down by about one third despite having worked almost as many stations.

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Marconi Memorial Contest VHF 2015

Monster Call

Family obligations prevented us to work from our usual portable QTH in JO61JF. So, we decided to run the contest from home. Günter, DL5YYM, came up with the idea of using DK65DARC. This is a special call of 65 year celebrations of the DARC. Although, it is a monster call for working a VHF contest we agreed.

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