Hospital

Bert is in the hospital.
He is already getting better,but will be in hospital for the next day's.

Hennie          XYL

Power Attenuator by Mark DL6YYM

Mark DL6YYM designed a power attenuator for 5 watt, using resistors of 1/2 watt. The attenuation of the attenuators, from the left to the right, is 20 dB, 10 dB, 3 dB and 3 dB. Seen from the front. This enables Mark to lower the power from 0 dB to 36 dB, in steps of 3 dB or 4 dB.

Click to enlarge

Mark built a beautiful enclosure for the attenuators.

This picture shows the interior. Seen from the back, you can see the 20 dB section on the right, behind the coax. This section has the larger number of resistors. The 10 dB is visible to the left of the 20 dB section.
At the left you can see the two 3 dB sections, each built with a total of 7 resistors.

Click to enlarge, to see all the details.

Mark used the PA1B Power Attenuator Calculator, to design the attenuators.
You can find the Calculator on the PA1B QRPp page,  This Calculator in Excel enables you to design an attenuator for any power, using common resistors from the E12-series. E.g. 1/2 watt. Mark used Open Office. Please note, that in Excel or Open Office you must use the decimal COMMA or POINT according to your national language. These attenautors are what I had in mind, when I developed the Power Attenuator Calculator. hi

The shack of DL6YYM.

I thank Mark for sending the pictures and for the great feedback on the attenuators.

LZ2HR

Click to enlarge   

I received an other beautiful QSL card from Hristo LZ2HR via the mail. This time the card had 3 QSO's on it. The QSO with the lowest power was made in the UBA contest 2010 in CW on 14 MHz. I used a power of 98 mW and a Inverted Vee, over a distance of 1180 miles resulting in 12041 Miles/Watt. Thanks, Hristo for the beautiful card.

Armando in Oud Amelisweerd

Vorige maand had ik de mogelijkheid om de tentoonstelling van Armando en een tiental andere kunstenaars te bezoeken. Op zaterdagmiddag gingen mijn vrouw en ik wandelen in Amelisweerd toen ik zag dat er een tentoonstelling was in het landhuis Oud Amelisweerd. Daarop heb ik besloten om de volgende dag de eerste rondleiding om 12:00 uur te nemen. In de rondleiding, die uitstekend gegeven werd door Joris, een vrijwilliger, heb ik alle kunstwerken van Armando en de andere kunstenaars bekeken.

Ik heb ook een Presentatie gemaakt, die je kunt bereiken via de volgende link:
Presentatie: Armando en het Chinese behang Click