11-10-2015, 06:59 PM
Crystal sets are capable of long distance reception under favourable conditions. The standard single tuned circuit driving headphones via a diode is not much good but careful low loss design of multiple coupled tuned circuits matched both to the aerial and the headphone load results in a set with quite frankly amazing performance compared with the basic variety. A look at some of the professional "tuner" designs from the late teens/early twenties is an eye opener.
Even the two tuned circuit one I built from a Radio Constructor article was good for quite a few BBC stations in the day, with Luxembourg and other continental stuff heard after dark from behind the Malvern Hills in Herefordshire.
Whether the expertise for that was around in the Channel Islands during the war is less likely. It's clear that even many relatively clued up people here are unaware of the possibilities.
Even the two tuned circuit one I built from a Radio Constructor article was good for quite a few BBC stations in the day, with Luxembourg and other continental stuff heard after dark from behind the Malvern Hills in Herefordshire.
Whether the expertise for that was around in the Channel Islands during the war is less likely. It's clear that even many relatively clued up people here are unaware of the possibilities.
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.=.( _---\__|___|_---_)
......O...Chris....O
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.=.( _---\__|___|_---_)
......O...Chris....O
