Re: LF: Razor blade RX .... Try a Cohere?

[Rik Strobbe <Rik.Strobbe@fys.kuleuven.be>]

Mal,

I have done it when I was 14 years old, it is not that difficult and  
is described in books and on the web.
What is the point that I (or others) have to prove to you that we know ?
Or do I have to pass an exam with you ?

73, Rik  ON7YD - OR7T

Quoting mal hamilton <g3kevmal@talktalk.net>:

> It seems everyone is MISSING THE POINT. I want someone to describe   
> how to make  RX using a RAZOR blade detector and also how to make   
> the HEADPHONE needed to hear the signal, using the sort of   
> components a soldier would have on the battlefront or a POW.
> Stick to the specific topic. I think noone knows how to do it.Think   
> 1940 period and what was available.
> g3kev
>
>   ----- Original Message -----
>   From: M0FMT
>   To: rsgb_lf_group@blacksheep.org
>   Sent: Tuesday, January 06, 2009 11:23 PM
>   Subject: Re: LF: Razor blade RX .... Try a Cohere?
>
>
>         Hi Mal and LF
>
>         I am disapointed in you Mal to be considering an envelope   
> detector. A true CW man, I would have thought, should only entertain  
>  the use of a Cohere detector!
>         Having played with them, I was surprised how well they work   
> over a range 136kc/s to 433mc/s (the extent of my power RF O/P)   
> probably work over a much lager range of frequencies but not tested   
> by me.
>         http://home.earthlink.net/~lenyr/coherer.htm
>
>         73 pefmt
>
>
>
>         --- On Tue, 6/1/09, mal hamilton <g3kevmal@talktalk.net> wrote:
>
>           From: mal hamilton <g3kevmal@talktalk.net>
>           Subject: Re: LF: Razor blade RX
>           To: rsgb_lf_group@blacksheep.org
>           Date: Tuesday, 6 January, 2009, 9:21 PM
>
>
>           Your own cct and ideas and the headphone construction. Not  
>  info from the web.
>           g3kev
>
>             ----- Original Message -----
>             From: riese-k3djc@juno.com
>             To: rsgb_lf_group@blacksheep.org
>             Sent: Tuesday, January 06, 2009 7:58 PM
>             Subject: Re: LF: Razor blade RX
>
>
>             310113517964   E bay too
>
>             On Tue, 6 Jan 2009 18:00:45 -0000 "mal hamilton"   
> <g3kevmal@talktalk.net> writes:
>               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
>
>
>
>
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