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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 -----
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
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
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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