Tuning device for Mullard Raleigh PM broadcast receiver, 1927.

Tuning device for Mullard Raleigh PM broadcast receiver, 1927.
2 4 c m
40cm
actual image size: 32cm x 16cm

Description

Until the 1980s rejection of unwanted radio stations was partly done by components like this tuning device. A fixed inductor is used with a variable capacitor - connected to the tuning knob - to form a variable band-pas filter that can be tuned to the frequency of the wanted station. In this home-built receiver the signal pases through several such filters, each of which has to be separately tuned by hand.

Image Details

Image Ref.
 
10325794

© Science Museum / Science & Society Picture Library

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