telefunken: 8; Concertino

I was wondering if anyone can explain the purpose and function of the bandwidth switch. Presumably it is to increase or decrease the range of frequencies tuned in to at one time, but for practical purposes what should it do?  

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The bandwidth switch, which only functions for the AM bands -- Lang, Mittel, Kurz, narrows the bandwidth of the IF section.  If you have two closely spaced AM stations in frequency, one station may interfere with the other.  The selectivity of the radio may not be enough to eliminate one of the stations.  This is particularly true on the shortwave band.  Local MW stations are usually spaced in frequency far enough, to prevent this.  The bandwidth switch increases the selectivity of the radio allowing you to tune in one station while keeping the other from interfering.  It is not always desirable to do this, however, as it reduces the audio fidelity of the station you want to listen to (the high frequencies are attenuated), hence the switch and your ability to turn it on and off.  This doesn't explain everything, but I hope it helps.

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Thanks that does answer my question clearly.

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