Return-Path: Received: from rly-mf04.mx.aol.com (rly-mf04.mail.aol.com [172.20.29.174]) by air-mf09.mail.aol.com (v121_r4.4) with ESMTP id MAILINMF093-9544964bcd4269; Wed, 07 Jan 2009 09:32:14 -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 MAILRELAYINMF042-9544964bcd4269; Wed, 07 Jan 2009 09:31:50 -0500 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1LKZRR-0003zI-K4 for rs_out_1@blacksheep.org; Wed, 07 Jan 2009 14:31:29 +0000 Received: from [83.244.159.144] (helo=relay3.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1LKZRO-0003rV-RH for rsgb_lf_group@blacksheep.org; Wed, 07 Jan 2009 14:31:26 +0000 Received: from mk-filter-1-a-1.mail.uk.tiscali.com ([212.74.100.52]) by relay3.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1LKZRN-0001sr-5v for rsgb_lf_group@blacksheep.org; Wed, 07 Jan 2009 14:31:26 +0000 X-Trace: 127397858/mk-filter-1.mail.uk.tiscali.com/B2C/$b2c-THROTTLED-DYNAMIC/b2c-CUSTOMER-DYNAMIC-IP/88.106.44.67/None/g4wgt@tiscali.co.uk X-SBRS: None X-RemoteIP: 88.106.44.67 X-IP-MAIL-FROM: g4wgt@tiscali.co.uk X-MUA: Microsoft Office Outlook 11Produced By Microsoft MimeOLE V6.00.2900.3350 X-IP-BHB: Once X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: AkYSAPxKZElYaixD/2dsb2JhbACCQyxUQIUbeoM4wigGhW8 X-IronPort-AV: E=Sophos;i="4.37,226,1231113600"; d="scan'208,217";a="127397858" Received: from 88-106-44-67.dynamic.dsl.as9105.com (HELO asus) ([88.106.44.67]) by smtp.tiscali.co.uk with ESMTP; 07 Jan 2009 14:31:13 +0000 From: "Gary - G4WGT" To: References: <24804.93209.qm@web28103.mail.ukl.yahoo.com> <00ba01c970d0$47d771e0$0301a8c0@mal769a60aa920> Date: Wed, 7 Jan 2009 14:31:13 -0000 Message-ID: <001b01c970d4$97eeff50$6401a8c0@asus> MIME-Version: 1.0 X-Mailer: Microsoft Office Outlook 11 Thread-Index: Aclw0JwHCrpdEE4TSh6LRTSgwF07QAAA2RRQ X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.3350 In-Reply-To: <00ba01c970d0$47d771e0$0301a8c0@mal769a60aa920> X-Spam-Score: 0.0 (/) X-Spam-Report: autolearn=disabled,HTML_MESSAGE=0.001 Subject: RE: LF: Razor blade RX Content-Type: multipart/alternative; boundary="----=_NextPart_000_001C_01C970D4.97EEFF50" X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.2 required=5.0 tests=HTML_60_70, HTML_FONTCOLOR_UNKNOWN,HTML_MESSAGE 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_001C_01C970D4.97EEFF50 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Mal, You wrote :- >>>>>> Dont know why you ask about AM, MF LF etc You previously wrote :- >>>>>>> Build one and have a QSO using this RX g3kev That seems to be the reason why. Gary - G4WGT. _____ From: owner-rsgb_lf_group@blacksheep.org [mailto:owner-rsgb_lf_group@blacksheep.org] On Behalf Of mal hamilton Sent: 07 January 2009 14:00 To: rsgb_lf_group@blacksheep.org Subject: Re: LF: Razor blade RX How would you make the earphone, what bits would you use. How exactly would 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 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. You have no junk box, you have to gather up the pieces lying around or would find in a trench or P0W camp. I can see now why noone could pass an examination except it was multiple choice type with all the answers in front of the canditate g3kev ----- Original Message ----- From: M0FMT To: rsgb_lf_group@blacksheep.org 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? An Rx to receive AM broadcast stations on the Medium wave or Long 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 their captors to make the RX? Together with a technical description of how the whole thing works? Shopping list like:- Razor blade, wire, telephone earpiece, pencil, safety pin, sliver paper for cap etc? But in more detail, the razor blade being a bit of a Red Herring because most oxides on metal surfaces will exhibit a none linear conduction characteristic required for AC rectification e.g the rusty nail effect beloved by the old C&G RAE.. Or have you got a "Smart Alec" solution? 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 present., 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" 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 > 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 5:16 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 ------=_NextPart_000_001C_01C970D4.97EEFF50 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Mal,

&nb= sp;

You wrote :-

>>>>>>= Dont know w= hy you ask about AM, MF LF etc

 

You previously wrote :-

>>>>>&g= t;> Build one and have a QSO using this RX g3kev

 

That seems to be the reason why.<= /font>

 

Gary – G4WGT.

&nb= sp;

&nb= sp;

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

 

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

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

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

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

I can see now why noone could pass an examination e= xcept it was multiple choice type with all the  answers in front of th= e canditate

g3kev

 

 

----- Original Message -----

Fro= m: M0FMT

Sent: Wedn= esday, January 07, 2009 12:44 PM

Subject: R= e: 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?

An Rx to receive AM broadcast stations on the Medium wave or Long 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 their captors to make the RX? Together with a technical descript= ion of how the whole thing works? 

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

 

Or have you got a "Smart Alec" solution? 

 

Please specify!

 

Regards 73 Petefmt

--- On Wed, 7/1/09, 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: Wednesday, 7 January, 2009, 11:38 AM

=
Please answer the question.  I did not ask if it could be used on 500 a=
t 
=
present., but if so one would TX using MCW=20=
or Keyed Tone and old spy tric.
g3kev
 
----- Original Me=
ssage ----- 
From: "Rik Strobbe" <=
;Rik.Strobbe@fys.kuleuven.be>
To: <rsgb_=
lf_group@blacksheep.org>
Sent: Tuesday, Ja=
nuary 06, 2009 9:53 PM
Subject: Re: LF: Razor=20=
blade RX
 
= 
=
 
> Mal,
> 
> I did build a "crystal r=
adio" 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 ve=
ry poor 
> detector.
> And it is an AM detector, so not useable for ham signals on 500=
kHz.
=
> 73, Rik  ON7YD - OR7T
> =
;
> 
> Quo=
ting mal hamilton=
 <g3kevmal@talktalk.net>:
>= ; 
>> Since I mentioned a Razor bla=
de and fence wire RX a while back I
>> h=
ave had several requests for a circuit. To give others the=

>> opportunity to submit a cct I will await replies. This=
 method was
>> used successfully  a=
t Coldiz and other POW camps to receive BBC
&g= t;> broadcasts.
>> Let us know how y=
ou would approach the subject. This is applicable
>> to MF/LF since the broadcasts at the time were receicved on the=
se
=
>> bands.
>> Build one and have a QSO using this RX<=
/pre>
>> g3kev
>> <=
/span>
> 
>&nbs=
p;
> 
> Di=
sclaimer: http://www.kuleuven.be/cwis/email_disclaimer.htm=

> 
> <=
/span>
 
 =

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

 
 =

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
 
 














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:=
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