Return to KLUBNL.PL main page

rsgb_lf_group
[Top] [All Lists]

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

To: <[email protected]>
Subject: Re: LF: Razor blade RX .... Try a Cohere?
From: "dave.riley3" <[email protected]>
Date: Wed, 07 Jan 2009 07:13:58 -0500
References: <[email protected]> <005001c970b9$e4cf6eb0$0301a8c0@mal769a60aa920>
Reply-to: [email protected]
Sender: [email protected]
Ah yes, the coherer, worked for me during a reconstruction of the W1AA/Marconi event...
 
But lets give credit to latter day technology as well and the Liquid Beretta, that truly sensitive with all AM detection capabilty invented by the august and sublime producer of genius, Reginald Fessenden...
 
Good thing that he had his clues on and that Armstrong used Reggie's heterodyne principal and also tamed deForest's audion into submission to do noble early radio work...
 
TNX fer your ears...  ( and eyes )
 
EOR  ( end of rant )
 
30s
 
Dave WD2XSH/17, in the Colonies...
 
 
----- Original Message -----
Sent: Wednesday, January 07, 2009 6:20 AM
Subject: Re: LF: Razor blade RX .... Try a Cohere?

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
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.
 
 
73 pefmt
 


--- On Tue, 6/1/09, mal hamilton <[email protected]> wrote:
From: mal hamilton <[email protected]>
Subject: Re: LF: Razor blade RX
To: [email protected]
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 -----
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" <[email protected]> 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
 
 


____________________________________________________________
Fashion Design Education - Click Here!



No virus found in this incoming message.
Checked by AVG - http://www.avg.com
Version: 8.0.176 / Virus Database: 270.10.3/1877 - Release Date: 1/5/2009 7:20 PM



No virus found in this incoming message.
Checked by AVG - http://www.avg.com
Version: 8.0.176 / Virus Database: 270.10.3/1879 - Release Date: 1/6/2009 5:16 PM
<Prev in Thread] Current Thread [Next in Thread>