The latest events ...

You can find some of the latest events around the club here.


Visit to a testing laboratory at CETECOM

Usually there are no visits by outsiders at the Düsseldorf site, but the company CETECOM invited us to inspect their test lab in Düsseldorf in the afternoon of April 21, 2017. CETECOM is a globally operating company, which primarily offers testing services in the communications industry.

Because the members of R01 Düsseldorf did not cover all of the available participants, some members of the neighboring local clubs, R09 Neandertal, R12 Ratingen and R22 Düsseldorf-Lohausen, also had the opportunity to follow the invitation. Thus 15 persons met to listened to the extraordinarily interesting and lively performance of Peter (DL2EAM) and Volker. Practical examples were presented to the participants in the broad field of activity of the company and the test laboratory, in which products with integrated radio technologies are tested (and occasionally destroyed) before launching the market. Comprehensible to all, the intermittent interference emissions of an LCD TV were measured and a DVD player was tormented with voltage spikes from the power supply of more than 1000 volts and voltage strikes in the kilovolt range on the equipment housing. All these are tests that a device must pass before sale.

In about two and a half hours, the employees reported on typical experiences with electronics suppliers and, most of all, about outstanding impressions of the past years. In the buidling coffee and cold drinks were ready, and in relaxed atmosphere some participants tested, how much radio reception their mobile phone still indicated in the HF-dense test room.

One of the participants summed up: "They both did very well, and I realized very quickly: They know what they are talking about. Anyone who did not take part in this tour missed something!" - A big thank to CETECOM for the hospitality and the granted insights.


Interested glances in the CETECOM test lab in Düsseldorf. (Picture: Andreas, DC4AB)

Home-brew competition 2017

On our local club evening in March 2017 our annual self-construction contest took place. There were 18 people, five of them had brought a self-made project. Each project was shown and presented for five minutes. Afterwards, there was time for the attendees to look at the projects more closely and to learn more details. Subsequently, all attendants were allowed to distribute winner points.

This year, Maximilian (DB1MC) landed on rank 1 with a battery with built-in electronics for charge control and unloading protection and a PLC communication board for the self-written evaluation software. Rank 2 reached Marc (DM1MF) with a capacitance measuring module for (unlabeled) SMD capacitors. On the third place came Johanna with an assembled kit-board pair with an amplitude-modulated LED transmitter and a receiver. These three places were awarded with a voucher each.

Other projects were a polyphonic melody circuit board with Atmel chip by Andreas (DC4AB) and a component collection for a frequency synthesizer of Vladimir (DL7PGA).

At the end, Andreas (DC4AB) presented a quantum-physical experiment with an air balloon, which warms up during entrainment and cools down noticeable by entropy when it re-contracts.


The winning project of DB1MC: Battery with built-in electronics,
communication board and measuring software. (Picture: Andreas, DC4AB)

Presentation by Klaus (DL5RFK) about "Voice radio with DMR"

On the local club evening on 16 February 2017, Klaus (DL5RFK) gave an interesting lecture on digital operating modes. The focus was slightly on DMR, compared in detail with C4FM and D-Star. He figuratively explained typical terms like 'Timeslot' and 'Talkgroup'. He also described the connecting networks behind the operating modes and reported on their emergence and the attempts to connect these networks. Finally, he showed the mobile and portable devices and the commercial and self-built repeaters and home entrances, which are currently available in the market for each operating mode. Klaus was supported by Klaus (DC6CM) and Jean (DG4IX) during his approximately 50-minute talk, which also brought along a few portabel devices and an user entrance to try out.


Right in the picture: Klaus (DL5RFK) during his speech at R01. (Picture: Andreas, DC4AB)

Annual general meeting 2017

On 19 January 2017 the annual general meeting 2017 of the local club R01 Düsseldorf took place. Peter (DL2EAM) kept the minutes. This year, the election of the board was on the agenda, the election committee was Manfred (DH9EO), he was supported by Franc (DC9PI). Andreas (DC4AB) was re-elected as local club chairman (OVV). Robert (SWL) was elected as local club vice chairman (stellv. OVV). Jochen (DG8EF) will continue managing the fund, the QSL placement is continued by Vladimir (DL7PGA). For the first time, an emergency officer was appointed with Fabian (DL1KID) for R01.

Looking back over the past year, the exceptional willingness to donate by the OV members as a solidarity community can be highlighted, which brought the equipment and the associated performance of our club station DL0DX to a new level. Compared to the previous year, a slight increase in membership of ten percent was observed.

Lastly, the OVV thanked for the support given last year and the confidence given to him, and he gave a small outlook on the forthcoming joint actions. The annual general meeting was successfully concluded after one hour.


Kale meal 2016

The traditional kale meal during the local club evening in December, this year 35 persons got together. Together with members of R01 also some members from the neighboring local clubs and family members came. Already one hour before the announced time the small room in our local club's restaurant filled - according to roumors an extension of the restaurant is planned for the coming year, so that there will be room for further guests. The very tasty green cabbage with meatballs, mettwurst and slices of smoked pork chop tasted magnificent again. Those who remained a few minutes after the meal to entertain themselves and exchange, again received a bar of the original R01 christmas chocolate for the conclusion of the year.


When the green cabbage was served, it became quiet in the room. (Picture: Andreas, DC4AB)

R01 was visiting the DLR

On the afternoon of the 30 November 2016, the local club R01 Düsseldorf visited the German Aerospace Center (DLR) in Cologne for approximately two and a half hours. After a brief welcome and a long walk across the grounds, we were able to learn many interesting details of the International Space Station (ISS), suspended above our heads as a model at a scale of 1:30 in the building of the DLR central administration. After that, we were taken to the :envihab, a medical research facility. There we were told about the effect of different environmental conditions on humans and possible counter-measures. Finally, we were able to visit the Microgravity User Support Center (MUSC). During the operation, we were able to look into the control center from which the European research facilities of the ISS are controlled. There was also a model in the original size of the Rosetta lander Philae, which landed in November 2014 on the comet 67P / Tschurjumow-Gerasimenko. Unfortunately, photography was prohibited on the entire site. Nevertheless, it was fun to see once in real, what you only see on TV.


Alaska lecture by DL5KUT

During the local club evening on 17 November 2016, Holger (DL5KUT) gave a very interesting talk about his radio trip to Alaska in 2012. In 50 minutes he showed the listeners about 180 selected photos of landscape and radio activity.


The audience is listening to Holger's (DL5KUT) speech. (Picture: Andreas, DC4AB)

Repair of the 40 meter dipole antenna

On the morning of the 27 October 2016 Holger (DL5KUT), Hanns-Georg (DJ7NY), Dieter (DL2GK) and Hans-Georg (DL6WA) met at the club station DL0DX for a repair of the dipole antenna for the 40 meter band. The antenna is mounted in about 25 meters high between the building of the Heinrich-Hertz-Berufskolleg and the building of the Franz-Jürgens-Berufskolleg. Unfortunately the standing wave ratio (SWR) of the antenna no longer agreed, so that a repair was necessary. With the help of the housekeeper the antenna was pulled over to a building side. When the dipole lay on the house roof, the problem was quickly recognized. In the center piece a limb of the dipole was broken off, the screw connection was broken from the housing. The middle isolator was quickly exchanged and the antenna hung up again. The standing wave ratio is now back where it should be (7.00 MHz at 1:1.2 · 7.08 MHz at 1:1.0 · 7.10 MHz: 1:1.0 · 7.20 MHz at 1:1.2). After three hours the work was done.


The defective centerpiece of the 40 m dipole. (Picture: Hans-Georg, DL6WA)

SSB fieldday 2016 with DL0DX/p

For the usage on the IARU region 1 SSB fieldday in 2016 with DL0DX/p, we had built a new antenna, which we wanted to use for the first time. In order to have time for testing, setting up the shortwave station in the DARC district R trailer on our fieldday site started a few minutes earlier than the previous year. Holger (DL5KUT), Hans-Georg (DL6WA), Andreas (DC4AB), Marc, Daniel (DM3DA), Fabian (DL1KID), Stefan (DB1KL), Kai (DL3EAZ), Manfred (DH9EO), Christoph (DO4TIF) and Jochen (DG8EF) collaborated establish the setup, so we were able to try out the new Fieldday antenna one hour before the start of the contest - a multi-band light-weight dipole for 80 to 10 meters powered by a chicken ladder. It was unfortunately shown that the carefully planned and built antennas did not work - the standing wave ratio on the contest bands was unexpectedly bad and could hardly be adjusted. So after a short consideration, the new antenna was cleared again and the precautionary antenna from previous years rebuilt - also a dipole fed over chicken ladder.

The expansion conditions were not good, but the operators Holger (DL5KUT), Fabian (DL1KID), Daniel (DM3DA), Andreas (DC4AB), Kai (DL3EAZ), Oliver (DK7TX) and Dieter (DL2GK) maked an effort. And thanks to so many radio operators, the shifts of the twenty-four-hour competition could be quite short this time.

A few meters next to the short wave station a tent with a 2 meter station with two stacked Yagi antennas was set up, in order to be able to participate in the simultaneous running 145 MHz September Contest alongside the shortwave contest. There was also a gas grill, which was provided for the physical welfare of those present.

For the power supply we used for the first time a sound-insulated, very economical benzine generator with downstream inverter, which generated a AC voltage with very clean sine wave. For approximately 25 hours of operation, the barely audible generator used only 15 liters of fuel. Next to the shortwave station an interruption-free power supply (on-line UPS) from Fabian (DL1KID) was placed, intercepting short-term current spikes.

While the Saturday was still sunny, a thunderstorm arose on Sunday morning, which approached unexpectedly, despite careful observation by the users. This forced us to stop the radio operation for about an hour because of the danger of a lightning strike, and wo looked for protection in our cars.

Burkhard (DO8EW) came to the dismantling, so that with combined forces everything was dismantled, invited, brought to the club station DL0DX and was unloaded within two hours.


The fieldday ground with tents and antenna farm. (Picture: Andreas, DC4AB)

DA3X/p was "On Air" again at the SSB field day 2016

Operators were Rudi (DL1EHR), Michael (DL5JS), Thomas (DK2TS) and Dieter (DL6EZ), Mirko (DM1EM) and SWL Maximilian helped building up the set. To allow Maximilian first steps regarding radio practice, an FM station was built, consisting of an IC-821 H (2 m/70 cm radio) and a 4-element flexayagi. Maximilian could be heard under the callsign DN3AA/p (training callsign of DL5JS) in "IARU Region 1 145 MHz September Contest". It has made him a lot of fun (the RF virus is activated now), the furthest connection succeeded 582 km by G8W.

On Saturday night at about 7 pm, we were visited by DF8QB, called "Power-Willi". He was commissioned by the fieldday manager DK2OY go to control various fieldday stations to see if everything was done properly. Of course, DA3X/p was rule compliant in the air, which Willi then could forward to Manfred (DK2OY).


Rudi (DL1EHR), Dieter (DL6EZ), Michael (DL5JS), Thomas (DK2TS) and Mirko (DM1EM) on setting up. (Picture: Dieter, DL6EZ)

Once again it could be a few more QSOs, but the conditions were simply "rotten". Thank God, in the night the storm moved past us north and south, so we did not have to interrupt the operation.

Conclusion: It has been fun times again and it was all a harmonious fieldday weekend.