Return-Path: Received: from rly-mf04.mx.aol.com (rly-mf04.mail.aol.com [172.20.29.174]) by air-mf10.mail.aol.com (v121_r4.4) with ESMTP id MAILINMF102-9544964cd50239; Wed, 07 Jan 2009 10:42:53 -0500 Received: from post.thorcom.com (post.thorcom.com [193.82.116.20]) by rly-mf04.mx.aol.com (v121_r4.4) with ESMTP id MAILRELAYINMF042-9544964cd50239; Wed, 07 Jan 2009 10:42:12 -0500 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1LKaXL-00060y-Q5 for rs_out_1@blacksheep.org; Wed, 07 Jan 2009 15:41:39 +0000 Received: from [193.82.116.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1LKaXL-00060p-0R for rsgb_lf_group@blacksheep.org; Wed, 07 Jan 2009 15:41:39 +0000 Received: from smtp-out-3.talktalk.net ([62.24.128.233] helo=smtp.talktalk.net) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1LKaXJ-0004fM-HI for rsgb_lf_group@blacksheep.org; Wed, 07 Jan 2009 15:41:38 +0000 X-Path: TTSMTP Received: from unknown (HELO mal769a60aa920) ([78.149.102.109]) by smtp.talktalk.net with SMTP; 07 Jan 2009 15:41:16 +0000 Message-ID: <010d01c970de$6120f410$0301a8c0@mal769a60aa920> From: "mal hamilton" To: References: <24804.93209.qm@web28103.mail.ukl.yahoo.com> <00ba01c970d0$47d771e0$0301a8c0@mal769a60aa920> <001b01c970d4$97eeff50$6401a8c0@asus> Date: Wed, 7 Jan 2009 15:41:16 -0000 MIME-Version: 1.0 X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.2180 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.2180 X-Karma: 0: X-Spam-Score: 0.1 (/) X-Spam-Report: autolearn=disabled,HTML_MESSAGE=0.001,HTML_TAG_EXIST_TBODY=0.126 Subject: Re: LF: Razor blade RX Content-Type: multipart/alternative; boundary="----=_NextPart_000_010A_01C970DE.60DE1EB0" X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.3 required=5.0 tests=HTML_60_70, HTML_FONTCOLOR_UNKNOWN,HTML_MESSAGE,HTML_TAG_EXISTS_TBODY autolearn=no version=2.63 X-SA-Exim-Scanned: Yes Sender: owner-rsgb_lf_group@blacksheep.org Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org X-Listname: rsgb_lf_group X-SA-Exim-Rcpt-To: rs_out_1@blacksheep.org X-SA-Exim-Scanned: No; SAEximRunCond expanded to false X-AOL-IP: 193.82.116.20 ------=_NextPart_000_010A_01C970DE.60DE1EB0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable It could be used but that was not the object of the excercise. It could be=20= used on 500 for a QSO because of the poor selectivity a number of signals wo= uld hetrodyne and produce a note with careful fiddling. Why has noone so far been able to answer a simple question and stick to the=20= topic. In the first instance what materials are required for the project and= where would one acquire each irem.=20 Someone suggested MAPLINS !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! g3kev =20 ----- Original Message -----=20 From: Gary - G4WGT=20 To: rsgb_lf_group@blacksheep.org=20 Sent: Wednesday, January 07, 2009 2:31 PM Subject: RE: LF: Razor blade RX Mal, =20 You wrote :- >>>>>> Dont know why you ask about AM, MF LF etc =20 You previously wrote :- >>>>>>> Build one and have a QSO using this RX g3kev =20 That seems to be the reason why. =20 Gary - G4WGT. =20 =20 ----------------------------------------------------------------------------= -- From: owner-rsgb_lf_group@blacksheep.org [mailto:owner-rsgb_lf_group@black= sheep.org] On Behalf Of mal hamilton Sent: 07 January 2009 14:00 To: rsgb_lf_group@blacksheep.org Subject: Re: LF: Razor blade RX =20 How would you make the earphone, what bits would you use. How exactly woul= d you use the razor blade, edge, broadside, for actual connection in cct and= how would you tweak it for max sensitivity. Dont know why you ask about AM,= MF LF etc. This sort of device is not likely to be any good on vhf. I already know all the answers. I am asking you and others how would you=20= do it. So far no one has described how to to build one and set it up. A telephone earpiece is not on the shopping list. You have to describe how= to make it. I will give you a clue, its a hiZ device, not like modern types= .=20 You have no junk box, you have to gather up the pieces lying around or wou= ld find in a trench or P0W camp.=20 I can see now why noone could pass an examination except it was multiple c= hoice type with all the answers in front of the canditate=20 g3kev =20 =20 ----- Original Message -----=20 From: M0FMT=20 To: rsgb_lf_group@blacksheep.org=20 Sent: Wednesday, January 07, 2009 12:44 PM Subject: Re: LF: Razor blade RX =20 OK Mal =20 What actually is the challenge then? =20 Just to make an RX using a razor blade as the guys in Coldiz did?=20 An Rx to receive AM broadcast stations on the Medium wave or Long=20= wave BC bands? I think that RX has been described previously in these exchanges. Or are you asking for one to be actually made and demonstrated? Or do you just want a shopping list of things to be stolen of thei= r captors to make the RX? Together with a technical description of how the w= hole thing works?=20 Shopping list like:- Razor blade, wire, telephone earpiece, pencil= , safety pin, sliver paper for cap etc? But in more detail, the razor blade=20= being a bit of a Red Herring because most oxides on metal surfaces will exhi= bit a none linear conduction characteristic required for AC rectification e.= g the rusty nail effect beloved by the old C&G RAE.. =20 =20 Or have you got a "Smart Alec" solution?=20 =20 Please specify! =20 Regards 73 Petefmt --- On Wed, 7/1/09, mal hamilton wrote: From: mal hamilton Subject: Re: LF: Razor blade RX To: rsgb_lf_group@blacksheep.org Date: Wednesday, 7 January, 2009, 11:38 AM Please answer the question. I did not ask if it could be used on 500 at pre= sent., but if so one would TX using MCW or Keyed Tone and old spy tric.g3kev= ----- Original Message ----- From: "Rik Strobbe" To: Sent: Tuesday, January 06, 2009 9:53 PM= Subject: Re: LF: Razor blade RX > Mal,> > I did build a "crystal radio" wit= h a razor blade as detectorwhen I> was 14 years old.> It had to be rusty to=20= work properly and even then it was a very poor > detector.> And it is an AM=20= detector, so not useable for ham signals on 500kHz.> > 73, Rik ON7YD - OR7T= > > > Quoting mal hamilton :> >> Since I mentioned a=20= 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 re= plies. 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 receicv= ed on these>> bands.>> Build one and have a QSO using this RX>> g3kev>> > >=20= > > Disclaimer: http://www.kuleuven.be/cwis/email_disclaimer.htm> > ------= -------------------------------------------------------------------------- =20= 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 =20 =20 ---------------------------------------------------------------------------- No virus found in this incoming message. Checked by AVG - http://www.avg.com=20 Version: 8.0.176 / Virus Database: 270.10.3/1879 - Release Date: 1/6/200= 9 5:16 PM ----------------------------------------------------------------------------= -- No virus found in this incoming message. Checked by AVG - http://www.avg.com=20 Version: 8.0.176 / Virus Database: 270.10.3/1879 - Release Date: 1/6/2009=20= 5:16 PM ------=_NextPart_000_010A_01C970DE.60DE1EB0 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
It could be used but that  was not the= object=20 of the excercise. It could be used on 500 for a QSO because of the poor=20 selectivity a number of signals would hetrodyne and produce a note with=20 careful fiddling.
Why has noone so far been able to answer a=20= simple=20 question and stick to the topic. In the first instance what=20 materials are required for the project and where would one acquire each irem= .=20
Someone=20 suggested MAPLINS !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
g3kev
 
 
----- Original Message -----
Gary -=20 G4WGT
Sent: Wednesday, January 07, 2009 2= :31=20 PM
Subject: RE: LF: Razor blade RX

Mal,

 

You=20 wrote :-

>>>>>>= ; Dont know why you ask about AM,=20 MF LF etc

 

You=20 previously wrote :-

>>>>>>> Build=20 one and have a QSO using this RX g3kev

 

That=20 seems to be the reason why.

 

Gary=20 =96 G4WGT.

 

 

From: owner-rsgb_lf_group@blacksheep.org=20 [mailto:owner-rsgb_lf_group@blacksheep.org] On Behalf Of mal hamilton
Sent: 07 January 2009 14:00
To:=20 rsgb_lf_group@blacksheep.org
S= ubject: Re: LF: Razor blade=20 RX

 

How would you make the earphone,=20 what bits would you use. How exactly would you use the razor blade, edge,=20 broadside, for actual connection in cct and how would you tweak it for max= =20 sensitivity. Dont know why you ask about AM, MF LF etc. This sort of devic= e is=20 not likely to be any good on vhf.

I already know all the answers. I=20 am  asking you and others how would you do it. So far no one has=20 described how to to build one and set it=20 up.

A telephone earpiece is not on the=20 shopping list. You have to describe how to make it. I will give you a clue= ,=20 its a hiZ device, not like modern types.

You have no junk box, you have to=20 gather up the pieces lying around or would find in a trench or P0W camp.=20

I can see now why noone could pass=20 an examination except it was multiple choice type with all the&n= bsp;=20 answers in front of the canditate

g3kev

 

 

----- Original Message -----=20

From: M0FMT=20

Sent:=20 Wednesday, January 07, 2009 12:44 PM

Subject:<= /FONT> Re: LF:=20 Razor blade RX

 

OK Mal

 

What actually is the challenge=20 then?

 

Just to make an RX using a razor blad= e as the=20 guys in Coldiz did?

An Rx to receive AM broadcast station= s on the=20 Medium wave or Long wave BC bands?

I think that RX has been described pr= eviously=20 in these exchanges.

Or are you asking for one to be actua= lly made=20 and demonstrated?

Or do you just want a shopping list o= f things=20 to be stolen of their captors to make the RX? Together with a=20 technical description of how the whole thing=20 works? 

Shopping list like:- Razor blade, wir= e,=20 telephone earpiece, pencil, safety pin, sliver paper for cap etc?=20= But=20 in more detail, the razor blade being a bit of a Red Herring becau= se=20 most oxides on metal surfaces will exhibit a none linear conductio= n=20 characteristic required for AC rectification e.g the rusty na= il=20 effect beloved by the old C&G=20 RAE..  

 

Or have you got a "Smart Alec"=20 solution? 

 

Please=20 specify!

 

Regards 73 Petefmt

--- On <= SPAN style=3D"FONT-WEIGHT: bold">Wed, 7/1/09, mal hamilton=20 <g3kevmal@tal= ktalk.net>=20 wrote:

Fro= m:=20 mal hamilton <g3kevmal@talktalk.net>
Subject: Re: LF: R= azor=20 blade RX
To: rsgb_lf_group@blacksheep.org
Date: Wednesday,= 7=20 January, 2009, 11:38 AM

Please answer t=
he question.  I did not ask if it could be used on 500 at 
present., but if so one would TX using MCW or Keyed Tone and=20=
old spy tric.
g3kev
 
=
----- Original Message ----- 
From: "Rik Strobbe" <Rik.Strobbe@fys.kuleuven.be>
To: <rsgb_lf_group@blacksheep.org>
Sent: Tuesday, January 06, 2009 9:53 PM
Subject: Re: LF: Razor blade RX
 
 
> Mal,
> 
> I did build=20=
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 v=
ery poor 
> detector.=

> And it is an AM detector, so not useable for ham signals on 500kHz.<=
o:p>
> 
> 73, Ri=
k  ON7YD - OR7T
> =

> 
> Quoting mal hamilton <g3kevm=
al@talktalk.net>:
> =

>> Since I mentioned a Razor blade and fence wire RX a while=
 back I
>> have had several requests for=20=
a circuit. To give others the
>> opportuni=
ty to submit a cct I will await replies. This method was
>> used successfully  at Coldiz and other POW camps to re=
ceive BBC
>> broadcasts.<=
/FONT>
>> Let us know how you would approach the subject. This is ap=
plicable
>> to MF/LF since the broadcasts=20=
at the time were receicved on these
>> band=
s.
>> Build one and have a QSO using this R=
X
>> g3kev
>&=
gt; 
> 
&=
gt; 
> 
&=
gt; Disclaimer: http://www.kuleuven.be/cwis/email_disclaimer.htm<=
/SPAN>
> 
> <=
/SPAN>
 
 
--------------------------------------------------------------------=
------------
 
 
=
 
No virus f=
ound in this incoming message.
Checked by AVG - h=
ttp://www.avg.com
Version: 8.0.176 / Virus Databa=
se: 270.10.3/1879 - Release Date: 1/6/2009 
5:16=20=
PM
 
 <=
/o:p>

 


No virus found in this incoming=20 message.
Checked by AVG - http://www.avg.com
Version: 8.0.176 / V= irus=20 Database: 270.10.3/1879 - Release Date: 1/6/2009 5:16=20 PM


No virus found in this incoming message.
Checked by AVG -=20 http://www.avg.com
Version: 8.0.176 / Virus Database: 270.10.3/1879 -=20 Release Date: 1/6/2009 5:16 PM
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