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Four valve homodyne (direct conversion*) battery receiver
In oak cabinet with doors. The doors are decorated with coromandel wood. At the top is a hinged lid with snap closure.
The knobs from left to right: rheostat for the mixer valve with the text "zwak/sterk" ("weak/strong"), antenna tuning, wave length switch with two push/pull switches above, the upper one for the scale lights (remarkable for a battery set) and the lower one for switching off the filament current circuit of the valves, followed by oscillator tuning and reaction control (as a matter of fact fase control of the oscillator). This remarkable circuit has not often been used in commercially manufactured receivers.
*) A direct-conversion receiver (DCR), also known as homodyne, synchrodyne, or zero-IF receiver, is a radio receiver design that demodulates the incoming radio signal using synchronous detection driven by a local oscilator whose frequency is identical to, or very close to the carrier frequency of the intended signal. This is in contrast to the standard superheterodyne receiver where this is accomplished only after an initial conversion to an intermediate frequency. Most modern radios use direct conversion. Using digital techniques, this design works a lot better than in the 1920s and 1930s.
Data Valves  
Serial number: 5331
Dimensions (hwd): 31.5 52.5 26.5 cm
Made in: 1928
Purchased in: 2014
Click on a valve for more information

Circuit

What was broadcast in 1928?

 

Listen to "Vrouwtjes zijn mijn zwakke zijde", sung by the Duo Hofmann, recorded in 1928

The closed cabinet. The doors are decorated with coromandel wood and have black knobs

A look inside the radio
Under-chassis view

This page was last edited on 27.04.2019