Home made.

Click on the picture for enlarge and info.

De DSW-80 is een QRP CW zend ontvanger voor de 80meter band.


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The "hatch" A Transformerless 10 Watt AM Transmitter for 80 meters.

Made in old cb box.


Click on the picture for enlarge and info.

70MHZ 150 Watt RF PA.

Made in old cb box.


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Morse decoder.


Morse code pen writer.


The Timber TX. 80 M. QRP CW zender.


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 80 MTR Foxhunter receiver.


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Antenna tuning (S match)

Antenna current meter.


Equipotential and Lightning Surge Protection.

Equipotential and Lightning Surge Protection.


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500 kHz transmitter.  Now works at 474 KHz.


Antenna for 475 Khz. 630 meter. Variable Inductor

Antenna for 475 Khz. 630 meter.   15 meters high and variometer.

        Wound on 31 cm-diameter pipe.                                                                       0.474 MHz SWR

        Variometer 700 to 950 uH.                                                                    

                                              Click on the picture above for enlarge.


How to build a variometer.  Variable Inductor

How to build a variometer.

 

A variometer is easy to build with readily available materials. Two plastic pipes of different diameters, insulated copper wire and a plastic rod for the shaft are the main components.

The figure shows the cross section and the way the coils are connected together.


Power supply twice 24 volts 15 ampere, and a 13.8 volt 35 ampere.

 


Click on the picture above for enlarge.

6 en 10 meter Duplexer.

Made for WSPR, for used with band hopping.


Duplexer 70 MHz / 50 MHz.  4 en 6 meter Duplexer
4 en 6 meter Duplexer  70 MHz and 50 MHz

Duplexer 70 / 50 MHz.

Made for WSPR, for used with band hopping.


low pass filter 144 MHz
lowpass filter 145MHz

Please note: the images on these sites show my own Morse keys and devices.

They may only be used for private purposes with reference to my site. (Source reference)