Tuesday 10 December 2019

Garden - Flora


Garden - Flora

In order to observe the changes through the seasons in my garden I intend to gather photo's here.

An overview of my garden:




1. Zomereik / Quercus Robur


May 2020


May 2020

2. Sneeuwbal / Vurbarnum Opulus


May 2020


May 2020

3. Vijver / Pond


May 2020, Gele Lis/Iris pseudacorus


17 May 2020

4. Grove den / Pinus sylvestris


May 2020

Dennenappels / Pinecones




5. Vijf

6. Esdoorn / Acer


May 2020


7. Winterharde palm / Trachycarpus fortunei


May 2020



May 2020

8. Appelboom / Apple tree / Malus domestica



June 2020

9. Appelboom / Apple tree / Malus domestica


                                                        January 2021

10. Perenboom / Pear tree




May 2020


July 2020
11. Appelboom / Apple tree / Malus domestica

                                                        January 2021


12. Pruimenboom / Prunus domestica


July 2020

Close-up


13. Appelboom / Apple tree


July 2020


14. Ligusturhaag / Ligustrum Ovalifolium


May 2020

15. Ruwe Berk / Birch / Betula Pendula

November 2020


16. Zestien

17. Zeventien

18. Achttien

19. (Witte) trosroos / Rosa Maria Mathilda


May 2020

20. Buxus


May 2020



21. Kas / Greenhouse




May 2020
22. Tweeentwintig

23. Eikenbladhortensia / Hydrangeaceae


August 2020




24. Sneeuwklokje / Galanthus Nivalus / Snowdrop

                                                                        January 2021


25. Engels raaigras / Lolium perenne


June 2020

25. Oranje havikskruid / Hieracium Aurantiacum


July 2020


26. Kardinaalshoed / Euonymus fortunei 


May 2020


27. Blauwe regen / Wisteria / Blue rain


June 2020

Close-up


28. Zonnebloem / Sunflower



July 2020

Close-up


29. Negenentwintig

30. Dertig

31. Eenendertig

Various

Ui /  Onion

August 2020


Bezemskruid / Senecio inaequidens
July 2020


Aster
July 2020




Rode lelie / Red lily

July 2020

Fibonnaci and Sunflowers

You can discover mathematics in the garden.

One takes a head of a sunflower, let it dry for a while and concentrates on the seeds and their arrangement.



The arrangement of spirals in the head of a sunflower appears to show Fibonnaci numbers:

Number of left hand oriented spirals: 55


Number of right hand oriented spirals: 34

The Fibonnaci Sequence is constructed with the formula F(n) = F(n-1) + F(n-2) and the beginning of the sequence is as follows:

1, 1, 2, 3, 5, 8, 13, 21, 34, 55, 89, 144..

Amazing that Fibonnaci numbers seem to appear in nature a lot.

If you divide 55 by 34, you get 1.617… which is very close to the number phi (golden ratio)




Saturday 2 November 2019

AM Stereo

Now and then I dismantle vintage audio equipment. It is good to see how professionals have designed their equipment. This time I had a closer look at the Denon AM-FM Stereo Tuner UTU-F88. I think it was designed around the '80-s.



I was surprised when I saw a part on the PCB that was allocated to 'AM Stereo'. This part of the PCB was not "bestueckt" (no components).



AM Stereo was never used in The Netherlands as far as I know. In the US however various AM Stereo systems have been  developped.







Thursday 17 October 2019

PA100KLM

The call PA100KLM was acquired by HAM Operators that participate in the station PI9KLM.

These are (but not limited to) PA0PCV, PA0WBZ, PA0SNY, PA3GDF, PH0PPL, PA2AAP and PA2MCE.
PI9KLM (see www.pi9klm.nl) was founded in 1947 to give radio operating practice to new navigators/radio operators on board KLM aircraft.

After navigators became obsolete (around 1962) the station remained active, and was operated by HAM's that worked and have worked for KLM, the national airline of the Netherlands, founded on October 7, 1919.

In coming period (October, November 2019) KLM has many activities to celebrate the 100th birthday. Being the oldest existing airline in the world, KLM is the first to reach this age.

Therefore the call PA100KLM will be used by the HAM operators of PI9KLM. The transmissions take place from Hangar 12, of KLM's Maintenance facilities at airport Schiphol. The call will be terminated on November 30.

OPERATIONS START ON OCTOBER 7, AT THE CENTURY BIRTHDAY.
Aiming frequencies are 14,250 USB +/- 25 kHz and 7.150 LSB +/- 15 kHz for the time being
LAT/LON@Hangar12 are N 52deg 17min 49sec and E 4deg 47min 32sec - QTH locator is JO22JH(51).


See https://www.qrz.com/lookup for detailed information.

Fokker F2 (early 1920's)
Fokker F2



Boeing 787-10