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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 -----
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!
From:
mal hamilton <[email protected]>
Subject: Re: LF: Razor
blade RX
To: [email protected]
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" <[email protected]>
To: <[email protected]>
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 <[email protected]>:
>
>> 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
>
>
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