The 9:00 UTC transmission on Alexanderson day June 28, 2015 was cancelled, due to technical difficulties. An earlier, unscheduled test transmission on Tuesday, June  23rd went well and no problems was to be found. But after a wet and rainy night between Saturday and Sunday, June 27-28, an insulator in the antenna feed system, just outside the transmission hall, caught fire, during the startup and tuning of the Alexanderson Alternator, resulting in that the transmitter had to be shut down and no transmission was made at 9:00 UTC.

After shutting down the transmitter, the repair began and no more than 30 minutes later, the “old lady” was ready again. A short test transmission at 09:45 UTC was made to verify the repair. Thank you all listeners for your patience!

The afternoon transmission at 12:00 UTC went well and the crew operating the transmitter, with Lars Kålland at the key, was relieved. An extra line was added to the transmitted message, appologizing for the cancelled transmission earlier the same day.

NEWS: HERE IS A VIDEO OF THE 12:00 UTC TRANSMISSION

We would like to thank all listeners for their QSL reports.
A summary of all listeners reports will be posted here. Keep looking.

Please leave your comments below about your experience with the SAQ transmission on June 28, 2015.

Isolator failure images & movie: John Primdahl, visitor (thank you!)
Other pictures: Kjell-Ove Cederholm, Alexander GVV



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3 thoughts on “Technical difficulties at Alexanderson day transmission 2015

  • 1 juli, 2015 at 22:33
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    I guess I am one of the closest listeners to the great alternator; just a wee bit north of Gothenburg. But, my receiving equipment is somewhat extraordinary – a self-built analog music synthesiser!
    As the transmitter frequency is well within the bandwidth of my audio processing circuits I realised that they could possibly be used as a VLF receiver. One of the synthesisers VCOs were used as a local oscillator, tuned to something like 17,8 kc/s (btw, ‘the grand old lady’ is far more stable than my music oscillators. There is no room for a mammoth flywheel in here… 🙂 ) A long wire as an improvised antenna was then connected through the synths preamplifer, then mixed with the VCO into the ring modulator unit (4-quadrant multiplier). The resulting signal at a few hundred Hz was then fed through a 4-pole low/bandpass filter and on to the loudspeakers.

    Now, I’m just a musician and audio engineer with limited, to say the least, experience in antennas and frequencies above hearing range. I had a result, but just barely. With careful listening and tuning of the filter I could hear most of the transmission, but almost drowned in other forms of noise in my setup. My next plan is to spend the time until christmas transmission to learn and design a proper antenna, and a better (less noise, more gain) preamp cirquit.
    Such a lovely reason to learn and look deeper into analog topics in this digitalised world!

    Also, I have to admit to a wee bit of ‘cheating’; I did have the dutch SDR online too, as a backup plan / reference. 😉

    I will stay tuned…

    Cheers,

    /Patrik

  • 30 juni, 2015 at 23:53
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    Dear team of Grimeton Radio,

    I am very glad that “the ”old lady” is ready again.” and that no permanant harm did remain, and that nobody was injured. I sent my somehow lengthy reception report as smail to you this morning.

    What I have ti mention here is …
    (1)
    Grimeton Radio is the first technical machine, after vessels, which was spoken of in the femininum. I suppose, some of your team were active in the “Swedisch Kriegsmarine” or/and were active as radio officers on civil sea going vessels.
    (2)
    How you managed to take a technical major problem to give sufficient information to your website’s readers, not only explainen very detailed what the reason was, how you managed to cope with the problem and to get on the air soon, to meet the afternoon schedule, all this together is a very good example how to make good, modern and efficient communication work to the public.
    (3)
    I do wish you and all your coworkers, the whole team, the very best in the future, personally and together and with Grimeton Radio (SAQ). I am always very happy (especially as a former professional “brass pounder”) when I here “vvv de SAQ” …

    Kind regards
    Hans G. Diederich, DK2XV

  • 29 juni, 2015 at 17:03
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    SAQ heard 5700 km away in FN35rk near Granby QC Canada, some 32 km northwest of R.A. Fessenden’s birthplace. Call sign copied around 11h43 UTC, some letters copied out of second message broadcast.

    Tuned 1.7m diamond loop, FET balanced preamp, Heros Technology VLF converter.

    Team: Jimmy VE2JWH, François VE2AAY, Stéphane VE2PSU,
    Mario VA2RMC, Yvan VA2DYB, Claude VE2CLW.

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