Set 5

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Receiver without case Receiver with case

The receiver with a nice painting made by Petra.

Circuit diagram of the receiver.

This is a real portable radio. It uses a 25x30 cm loop antenne.
14 ferrite bars (60x8 mm) are mounted inside the loop, this improves the reception.
On the picture above one can see the black ends of the ferrite bars.
The more ferrite bars you use, the better the reception will be. Longer and thicker bars will also give improvement.

The transformer is modelnr: 952.431 made by Adastra. It has a primary impedance of 80 kΩ.
The diode BAT85 is very adequate at impedances of 80 k
Ω.

The coil has 12 windings made of litze wire 40x0.07mm
By using the ferrite bars the inductance of the coil (loop) increases, without the ferrite bars the coil would need more windings in order to have the same inductance.

At daytime I can receive the following stations.

kHz

Station

Country

Location

kW

km

648

BBC Worldservice

G

Orfordness

500

229

675

Arrow

HOL

Lopik

120

17

747

747 AM

HOL

Flevoland

400

41

1395

Radio 10 Gold

HOL

Trintelhaven

25

62

At night I received about 20 stations (as a speaker I am then using a  driver unit).

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