Prototype of the home designed alu plate arrived

Once again, a small stone has been laid in the river of ongoing projects: an aluminum plate, designed by myself, that aims to solve the shortcomings of the mini-tiltplate.

Although the tiltplate plays a crucial role in my station for antenna selection, it comes with several limitations:

• Each type of Yagi boom requires a different solution. Usually, the boom can be mounted inside the tiltplate, but for certain types—such as the 80mm square boom—more complex technical workarounds are necessary.

• Aligning round boom tubes is a slow and painstaking task.

• For larger antennas, my mini-tiltplate is inadequate due to a lack of sufficient mounting points.

• When a vertical boom truss is required, the mini-tiltplate offers no solution.

After much thought, I’ve come up with a solution that addresses all these issues: an adaptive aluminum plate that fits the chosen antenna perfectly. It is pre-mounted on the antenna boom and can be easily connected to the tiltplate using seven M10 bolts, with respect to the karlock security system. 

Ensuring that the antenna hangs perfectly horizontal is now achieved with two adjustment screws spaced at the correct distance—no more hoping that things will align properly once airborne, but rather having certainty in advance. That makes a real difference.

My first prototype plate was delivered this week.

Fixed vertical positioning, independent of the used antenna.

Original mini tiltplate.

This plate can easily accommodate both the OB5-10 with a round boom in combination with the SteppIR, as well as the OB2-40 with an 80mm square boom.

The Dutch company (www.lasopmaat.nl) that cut the plate works with input based on a DXF file. It was a bit of a throwback to my mechanical AutoCAD drawing days—over 30 years ago—to get this drawn. LibreCAD is a free piece of software that can generate this type of file.

The result meets all expectations. I was a bit nervous checking whether any measurement errors had slipped in—but fortunately, everything turned out perfectly.

The next step is getting the Yagi back in the air.

This opens the path for the use of several bigger monoband antennas that can be installed within minutes.

IARU 2025 as operator in the OP0HQ team

Twenty years after my first participation in the national OP0HQ contest team—back then with ON4UN on 40m CW—I unexpectedly found myself part of the national team once again. This time, I was responsible for 10m SSB. Last year, I had already used this band slot to test the Optibeam5-10, which resulted in a very disappointing 250 contacts and the impression that conditions were exceptionally poor.

This year, propagation on 10m was even worse, and I only managed to log 271 contacts. Admittedly, there were a few nice ones from the African continent and South America, including the Falklands, but not a single contact with the USA or Japan. The trend was similar across all competing headquarter teams, but as usual, zone 27 was hit the hardest. It’s tough to transmit for so long with so little to show for it.

Shack improvement almost done

 

The shack upgrade is now nearly complete. 

Installing and integrating the various devices from the FlexRadio/403A family has so far been accomplished with just a few mouse clicks. The first impression of the tuner is that it’s worth its weight in gold when it comes to wire antennas. The amplifier is lightweight compared to a tube amplifier, but the ventilation system is louder than I had hoped.

Now it's just a matter of waiting for the ordered Genius 8x2 antenna switch to arrive, and then deciding whether to add a second transceiver—either a FlexRadio 8600/Aurora 520 or to stay with the 6400 for a while and buy a new one when software v4 is available. The goal is to be fully operational in the shack by spring 2026, and to have the antennas renewed by summer 2026. The coming months will be focused on 50 MHz, and then shifting to 80 and 160 meters from autumn onwards.

All installed on a single PC table and easy to disconnect in case of thunderstorm.

DXCC 323 : Prince Edward & Marion Islands

Once again, a rather unexpected last-minute expedition to a rare DXCC. 

And once again, the wrong antennas were in the air. 

This time, ZS8W was active on 10 meters—a piece of cake to work with the Optibeam, if only it hadn’t been lying on the ground while the SteppIR was up in the air. In the end, I still managed to make the contact in FT8. LoTW confirmed and QSL received. 20 DXCC to go.

Then a pleasant surprise: I worked them on 30 meters using the G5RV wire antenna. Although this band isn’t ideally suited for the G5RV, I was able to tune it with the new TunerGenius. To my amazement, he came back to my call immediately. Upon further investigation, it turns out there’s a very interesting radiation pattern on 30 meters, which happened to be perfect for the southern direction. And once again it proves: a seemingly poor antenna works a hundred times better than no antenna at all.

30m pattern on normal G5RV

CQWW SSB & CW 2024 unassisted 10m : a nice second place all time in SSB and a new national CW record

 This year, I chose to fully focus on 28 MHz with the Optibeam5-10 monobander. While the IARU contest was somewhat disappointing, both CQWW contests were successful.

With over >2000 QSO in SSB and >2000 QSO in CW, I can only be very satisfied with this antenna.
For both contests, I claimed to have set a new national record, but things turned out somewhat differently.

In the SSB section, the record set by Mark ON4WW (formerly ON4AMT) has stood since 1988. With also the ON8BK's third place ever, the year 1988 seemed to be a "Grand Cru".

After the contest, I received a friendly email from Marc putting his record into perspective: 100 W, a 7-element Yagi, and manual logging without any corrections from the jury. This was in contrast to my 1500 W, 5-element Yagi, but with a fully reviewed log. This did not feel right. Competing on an even playing field is fun and motivating, but this was different. >10dB more power isn't competition.

Moreover, I had the lingering thought that disqualification might be in the air. My signal was not okay, but I only received a comment about it halfway through the contest from a top U.S. station. I was dealing with an issue I wasn’t aware of because I had never used the combination of N1MM voice keyer with the FlexRadio before. Reducing the mic gain, turning off the voice processor on the mic—nothing helped. Later, after researching online, I discovered what the problem was. The signal from N1MM is controlled via the DAX software running in the background. The TX level there was fully open, but I hadn’t realized it. CAT and DAX are two applications that run in the background of the Flex SDR software. In principle, you never need to look at them except during the initial setup.

In the final results, I lost 7.3% of my points. This is less than the contest average of 8.6%, but in my opinion, far too much. Moreover, it was enough to place me below Mark’s result. I analyzed the error log, and the main factor was the loss of three multipliers. One was due to a typo in the call sign, which is very unfortunate. A KL7 was not found in the log, leading to the loss of both a DXCC and a zone multiplier. That was very costly. It’s a pity I didn’t have the right hardware at the time to record the contest. I can’t verify what happened, but it resulted in a significant reduction in points.

In any case, it is no disgrace to finish in second place like this.

Top 5 all time single operator unassisted 10 meter :

After this contest, I gathered the necessary equipment to record 48-hour contests in full.

The CQWW CW contest, on the other hand, went as hoped. A new national record in the unassisted category and even a better score than my 10M result in the assisted category.  

5th place zone 14, 6th place Europe and 14th worldwide.  Happy with it.

The conditions were excellent. This time, I stopped a little earlier on Sunday evening because a neighbor was experiencing RF interference (due to using very old TV and radio equipment with absolutely no immunity).

In CW, however, I did miss the capabilities of the FlexRadio combined with Skimmer. Unassisted creates constant stress about missing multipliers. Knowing they are out there but not seeing them and having to search while running significantly reduces my fun factor. The best way to avoid being accused of assistance is to stay on one frequency as much as possible, which was also my strategy. Nowadays, large stations have such strong in-band capabilities that they actively seek out contacts themselves.

At the end of this year, I will probably compete in 10m CW-assisted again and maybe also try SSB-assisted. But first, the WPX contests…

2024 QSL ready for sending to buro

 In 2004 I made almost 8.000 QSO.  100% PSE QSL are now ready for buro.

2.500 QSL cards with destination USA.

A second batch with RRDXA 60th anniversary going to the European stations

WSJT-X no transmit

While investigating the reason why there was suddenly no reception in WSJT-X (see the post below), I ended up tweaking some parameters, which resulted in FT8 transmission no longer working either.

After much trial and error, here is the solution:

Both channels must be set to "mono" and not to left or right.

WSJT-X error in sound input

Today I encountered an issue when starting WSJT-X that appeared completely out of nowhere, namely the error message 'error in sound input.'

It is very frustrating to face something like this because both the FlexRadio and Windows are essentially black boxes, making it challenging to find a solution.

Various solutions are listed online, ranging from RF-related issues to driver problems. The latter, replacing drivers, is a major step that I’d rather avoid.

After much searching and experimenting, I happened to come across the screen under 'Settings' -> 'Microphone.'

There, access was blocked. Enabling it resolved the issue.