Return-Path: Received: from rly-df08.mx.aol.com (rly-df08.mail.aol.com [172.19.156.21]) by air-df08.mail.aol.com (v121_r5.5) with ESMTP id MAILINDF081-56d4964b58f320; Wed, 07 Jan 2009 09:01:18 -0500 Received: from post.thorcom.com (post.thorcom.com [193.82.116.20]) by rly-df08.mx.aol.com (v121_r4.4) with ESMTP id MAILRELAYINDF084-56d4964b58f320; Wed, 07 Jan 2009 09:00:49 -0500 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1LKYxW-0002os-3W for rs_out_1@blacksheep.org; Wed, 07 Jan 2009 14:00:34 +0000 Received: from [193.82.116.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1LKYxV-0002oj-Fw for rsgb_lf_group@blacksheep.org; Wed, 07 Jan 2009 14:00:33 +0000 Received: from smtp-out-1.talktalk.net ([62.24.128.231] helo=smtp.talktalk.net) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1LKYxQ-00028R-Bu for rsgb_lf_group@blacksheep.org; Wed, 07 Jan 2009 14:00:33 +0000 X-Path: TTSMTP X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: AnsFALhDZElOlWZt/2dsb2JhbACCPzAhgUaGXQbET4V1 Received: from unknown (HELO mal769a60aa920) ([78.149.102.109]) by smtp.talktalk.net with SMTP; 07 Jan 2009 14:00:20 +0000 Message-ID: <00ba01c970d0$47d771e0$0301a8c0@mal769a60aa920> From: "mal hamilton" To: References: <24804.93209.qm@web28103.mail.ukl.yahoo.com> Date: Wed, 7 Jan 2009 14:00:21 -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_00B7_01C970D0.478D97A0" X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.1 required=5.0 tests=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_00B7_01C970D0.478D97A0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable How would you make the earphone, what bits would you use. How exactly would=20= you use the razor blade, edge, broadside, for actual connection in cct and h= ow would you tweak it for max sensitivity. Dont know why you ask about AM, M= F 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 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 t= o 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 would= find in a trench or P0W camp.=20 I can see now why noone could pass an examination except it was multiple cho= ice type with all the answers in front of the canditate=20 g3kev =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 OK Mal What actually is the challenge then? 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 wa= ve 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 their=20= captors to make the RX? Together with a technical description of how the who= le thing works?=20 Shopping list like:- Razor blade, wire, telephone earpiece, pencil,=20= safety pin, sliver paper for cap etc? But in more detail, the razor blade be= ing a bit of a Red Herring because most oxides on metal surfaces will exhibi= t a none linear conduction characteristic required for AC rectification e.g=20= the rusty nail effect beloved by the old C&G RAE.. =20 Or have you got a "Smart Alec" solution?=20 Please specify! 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=20 present., but if so one would TX using MCW or Keyed Tone and old spy tric. g3kev ----- Original Message -----=20 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" 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=20 > detector. > And it is an AM detector, so not useable for ham signals on 500kHz. > > 73, Rik ON7YD - OR7T > > > Quoting mal hamilton : > >> 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 > > ----------------------------------------------------------------------------= ---- 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=20 5:16 PM =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: 1/6/2009=20= 5:16 PM ------=_NextPart_000_00B7_01C970D0.478D97A0 Content-Type: text/html; charset="utf-8" Content-Transfer-Encoding: quoted-printable
How would you make the earphone, what bits=20= would=20 you use. How exactly would you use the razor blade, edge, broadside, for act= ual=20 connection in cct and how would you tweak it for max sensitivity. Dont know=20= why=20 you ask about AM, MF LF etc. This sort of device is not likely to be any goo= d on=20 vhf.
I already know all the answers. I am =20= asking=20 you and others how would you do it. So far no one has described how to to bu= ild=20 one and set it up.
A telephone earpiece is not on the shopping= list.=20 You have to describe how to make it. I will give you a clue, its a hiZ devic= e,=20 not like modern types.
You have no junk box, you have to gather up= the=20 pieces lying around or would find in a trench or P0W camp.
I can see now why noone could pass an exami= nation=20 except it was multiple choice type with all the  answers in f= ront=20 of the canditate
g3kev
 
 
----- Original Message -----
M0FMT <= /DIV>
Sent: Wednesday, January 07, 2009 1= 2:44=20 PM
Subject: Re: LF: Razor blade RX

OK Mal
 
What actually is the challenge then?
 
Just to make an RX using a razor blade as the guys in Coldiz di= d?=20
An Rx to receive AM broadcast stations on the Medium wave or Lo= ng=20 wave BC bands?
I think that RX has been described previously in these=20 exchanges.
Or are you asking for one to be actually made and=20 demonstrated?
Or do you just want a shopping list of things to be stolen of t= heir=20 captors to make the RX? Together with a technical description of how= the=20 whole thing works? 
Shopping list like:- Razor blade, wire, telephone earpiece, pen= cil,=20 safety pin, sliver paper for cap etc? But in more detail, the razor=20 blade being a bit of a Red Herring because most oxides on metal surf= aces=20 will exhibit a none linear conduction characteristic required=20 for AC rectification e.g the rusty nail effect beloved by the o= ld=20 C&G RAE..  
 
Or have you got a "Smart Alec" solution? 
 
Please specify!
 
Regards 73 Petefmt

--- On Wed, 7/1/09, mal hamilton=20 <g3kevmal@talktalk.net> wrote:
From:=20 mal hamilton <g3kevmal@talktalk.net>
Subject: Re: LF: Raz= or=20 blade RX
To: rsgb_lf_group@blacksheep.org
Date: Wednesday, 7= =20 January, 2009, 11:38 AM

Please answer the question.  I=
 did not ask if it could be used on 500 at=20
present., but if so one would TX using MCW or Keyed Tone and old spy tric.
g3kev

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


----------------------------------------------------------------------------=
----



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=20
5:16 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
------=_NextPart_000_00B7_01C970D0.478D97A0--