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Do crystal radios still pick anything up?
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The Natural Philosopher[_2_]
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Do crystal radios still pick anything up?
On 26/02/16 03:01,
wrote:
On Thursday, 25 February 2016 22:21:13 UTC, Andrew Gabriel wrote:
In article ,
"Dan S. MacAbre" writes:
Apologies to those who know about this stuff, if this is a stupid
question. Seeing the electronics thread reminded me of some of my
mis-spent youth. I never knew enough about electronics to design
anything, but I could usually get something like an amp or a tape
recorder from the tip, and fix it. That was about my limit. I used to
enjoy making crystal radios from some of the bits I'd have lying around,
but no matter what I used, I only ever seemed to be able to pick up what
seemed to be radio 4. If you were to build one nowadays, would there be
any suitable non-digital station left to pick up?
Funny you should mention this...
A couple of weeks ago, I stayed over at my parents, and in the bookshelf
was my old Ladybird book on making a radio, which takes you through the
stages of making the receiver and then adding an amplifier to it.
If you can still buy OC71's, it would still work today. ;-)
http://www.mds975.co.uk/Content/geor...trf_radio.html
Unusual method of biasing/driving the OC71.
Indeed. The first transistor radio I built was a 27Mhz RC radio and it
was biased like that. It worked. Until I left in on a window sill in the
sun. I then discovered things like 'temperature stability'...
Last time I looked you could still buy germaniums, albeit a very minimal range.
lots of dealers in old new stock as it were. Same as valves.
NT
--
New Socialism consists essentially in being seen to have your heart in
the right place whilst your head is in the clouds and your hand is in
someone else's pocket.
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