Wednesday, 31 December 2014


Dear readers of this blog,

Best wishes for 2015 with lots of radiofun

     Masterpiece of engineering; "Spijkenniserbrug" near Pernis over the "Oude Maas"

Pernis Railways

                                        Wisent near "Amsterdamse Bos"


                                       Haarlem, Spaarne, April 2015

                                     Haarlem, Spaarne II

Monday, 29 December 2014

Circuit diagrams of 13 cm ATV transmitter

In order to remember the 13 cm ATV project later with the proper details I made three drawings in "Paint". I made a .bmp circuit drawing of the transmitter, baseband circuit and microphone amplifier:

ATV transmitter

Baseband circuitry

Thursday, 18 December 2014


I found an old photo of a physics experiment I did in highschool back in 1979.
It shows a Lissajous curve. A lightbulb on a string draws the lines of the curve on
a film in an analogue camera set to high exposure time.
Black/white only since I developped the picture in the old-fashioned way (with patterson development tank and fluids; no smartphones with Megpixels available at that time).

Saturday, 13 December 2014

Stereo microphone

During last visit of the PI4RAZ club meeting there was some used equipment for sale.
I found a nice Philips N8402 dynamic stereo microphone.
I hope to use this mike for the ATV video transmitter under construction.

More tech info about this microphone (designed around 1970):

                                Stereo microphone Philips N8402