Τρίτη, 26 Απριλίου 2011

MEDIUM AND LONG WAVE ANTENNA BOOSTER



The following construction is an LC circuit, which will increase the signal strength of  MW and LW radio broadcasts.


Materials, you will need:


PVC tube about 25 cm long, of 4 cm diameter (Φ4cm).

Copper wire of 1mm diameter (Φ1mm).




Ten ferrite bars 20 cm long, of 1cm diameter (Φ1cm).


 


Place the ferrite bars inside the tube carefully, as they broke easily.





The coil consists of 40 turns. 
It is wounded in the middle of the tube.
More turns move the frequency range to 500 KHz, less to 1700 KHz.
Two holes needed to pass the wire inside the tube to the banana plugs.



The variable capacitor I used has got three sections. One section is enough for MW reception. All three sections connected, will tune the antenna down to 200 KHz. For reaching 150 KHz, an extra ceramic capacitor is necessary.Try different types of wire from the coil to the variable capacitor, as some wires will change the frequency range significantly.

The whole project is designed by Brazilian Dxers, and the above information found in Brazilian web sites, was in Portuguese. My experimentation refers to LW reception. All materials were available in the Greek market.



Finally







Receiving Cyprus on 603 KHz, in Nea Makri, Attiki, Hellas, around 17:00 in winter. 
(Sunday Football programme).



 Listening to Polskie Radio in Long Waves, 225 KHz, summertime at night.








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