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Re: voice powered radio

Von: Brian Howie (brian@nospam.demon.co.uk) [Profil]
Datum: 04.11.2009 20:35
Message-ID: <T0IZxEBtdd8KFwDp@b-howie.demon.co.uk>
Newsgroup: uk.radio.amateur
In message
<fd3fcdb9-95a0-454b-8b70-3d3b6ab8d13d@k4g2000yqb.googlegroups.com>,
EA1/G1LVN <gareth.paley@gmail.com> writes
>On 4 Nov, 08:42, Brian Howie <br...@nospam.demon.co.uk> wrote:
>> Found on the AM Forum.
>>
>> Occasionally in ham radio, there a few things that turn  up now and
>> again that make my jaw drop- this is one of them.
>>
>> Http://mjrainey.googlepages.com/elsilbo
>>
>> "This double-sideband (DSB) radiotelephone transmitter is powered
>> entirely by the instantaneous (not stored) energy produced in the
>> operator's voice. The RF output power in my prototype falls within the
>> range of 5 to 15mW. The circuit is essentially a high-level DSB
>> modulator/crystal-controlled RF oscillator."
>>
>> Seems the louder you shout , the further you get.
>>
>> 73s Brian GM4DIJ
>> --
>> Brian Howie
>
>I seem to remember some Scottish Chap did the same thing with just a
>couple of wires back in 1877.
>
>that guy's just invented the AM transmitter (without the audio amp
>stage). But fair play to him, it is amazing how far you can get with a
>few milliwatts - I would imagine it takes quite a bit of patience
>though (and a loud hailer)


The next clever bit is trying to get the receiver to work that way.

B

--
Brian Howie
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