At the moment of transmission the 28MHz-432MHz transverter delivered 2 Watts only.
Off-topic (1):
Collection of WO2 communication equipment in the 'Oorlog- en verzetsmuseum', Overloon.
Off-topic (2):
Garden Art
Thursday, 9 January 2020
First FT-8 signals transmitted on 432 MHz
Yesterday I transmitted my first FT-8 signals on 432.176 MHz. PA3EWP received those signals:
At the moment of transmission the 28MHz-432MHz transverter delivered 2 Watts only.
Off-topic (1):
At the moment of transmission the 28MHz-432MHz transverter delivered 2 Watts only.
Off-topic (1):
Monday, 6 January 2020
28 MHz - 432 MHz transverter
I started to work on a transverter that converts 28 MHz (10 m band) to 432 MHz (70 cm band). I use a FT450 to process the 28 MHz signals. At 432 MHz the transverter is capable of delivering about 5 Watts RF. A Power Supply Unit from an old PC was used for the 12V/12 Amp and 5V/20 Amp electrical power supply .
The transverter and control board I used were purchased in the Ukraine. See http://transverters-store.com/ and also ebay.
Transverter board
Frontview transverter
The transverter and control board I used were purchased in the Ukraine. See http://transverters-store.com/ and also ebay.
Control board with 50 ohms/10 Watt load
First results are promising. I could listen to repeater signals in FM. I hope it will be possible to work with digimodes later on. I will consider adding a PA stage to increase the RF output (to 10..20 Watts).
Friday, 3 January 2020
Kilrock Radio
On Medium Wave I discovered 'Kilrock Radio'.
They broadcast rock music from the '50-'80s. This is a small radio broadcast station located near Dordrecht. They transmit with 100 Watt RF power on 1287 kHz. I discovered that they can be received on my car radio receiver on various locations in Zeeland and Zuid-Holland. In the evening/night they are often 'overruled' by a Spanish station.
https://kilrock.nl/
They broadcast rock music from the '50-'80s. This is a small radio broadcast station located near Dordrecht. They transmit with 100 Watt RF power on 1287 kHz. I discovered that they can be received on my car radio receiver on various locations in Zeeland and Zuid-Holland. In the evening/night they are often 'overruled' by a Spanish station.
https://kilrock.nl/
Monday, 16 December 2019
Headphone amplifier
The headphone amplifier with VU-meters almost finished:
https://www.banggood.com/NE5532-OP-AMP-HIFI-Amplifier-Preamplifier-Volume-Tone-Control-Board-p-1098533.html?rmmds=search&cur_warehouse=CN
The pre-amp uses two NE5532 low-noise integrated circuits
https://www.banggood.com/NE5532-OP-AMP-HIFI-Amplifier-Preamplifier-Volume-Tone-Control-Board-p-1098533.html?rmmds=search&cur_warehouse=CN
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
2. Sneeuwbal / Vurbarnum Opulus
3. Vijver / Pond
4. Grove den / Pinus sylvestris
5. Vijf
6. Esdoorn / Acer
7. Winterharde palm / Trachycarpus fortunei
8. Appelboom / Apple tree / Malus domestica
9. Appelboom / Apple tree / Malus domestica
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
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. Tweeentwintig23. 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)
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