Re: LF: Razor blade RX

["mal hamilton" <g3kevmal@talktalk.net>]

Doc
Its hard to believe so many people are missing the point. No one has yet 
mentioned how to make the device. How to set the RAZOR blade detector up and 
how to construct the EARPHONE needed.
What is the impedence of the earphone and how a person would make one 
especially in 1940, although it would still apply today
g3kev

----- Original Message ----- 
From: "Dr. Tom Gruis" <donnatom@netins.net>
To: <rsgb_lf_group@blacksheep.org>
Sent: Tuesday, January 06, 2009 10:34 PM
Subject: RE: LF: Razor blade RX


> Ah!
>
> Crystal sets! More of the joy of analog....
>
> Doc,
>
> -----Original Message-----
> From: owner-rsgb_lf_group@blacksheep.org
> [mailto:owner-rsgb_lf_group@blacksheep.org] On Behalf Of Rik Strobbe
> Sent: Tuesday, January 06, 2009 15:54
> To: rsgb_lf_group@blacksheep.org
> Subject: Re: LF: Razor blade RX
>
> Mal,
>
> I did build a "crystal radio" with a razor blade as detector when I
> was 14 years old.
> It had to be rusty to work properly and even then it was a very poor
> detector.
> And it is an AM detector, so not useable for ham signals on 500kHz.
>
> 73, Rik  ON7YD - OR7T
>
>
> Quoting mal hamilton <g3kevmal@talktalk.net>:
>
> > Since I mentioned a Razor blade and fence wire RX a while back I
> > have had several requests for a circuit. To give others the
> > opportunity to submit a cct I will await replies. This method was
> > used successfully  at Coldiz and other POW camps to receive BBC
> > broadcasts.
> > Let us know how you would approach the subject. This is applicable
> > to MF/LF since the broadcasts at the time were receicved on these
> > bands.
> > Build one and have a QSO using this RX
> > g3kev
>
>
> Disclaimer: http://www.kuleuven.be/cwis/email_disclaimer.htm

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