[ARC5] Fw: Crystal Question

Henry Mei'l's meils at get2net.dk
Sat Nov 13 09:39:19 EST 2010 

I downloaded an internet site:

'ACS Analytical Chemistry, Research paper' --

A detailled description of an electrolytic detector operating "at 60 Hz ... 
and near 1 MHz."
Several sites were found where the detector is described as quite sensitive.
Also an encapsulated one was developed and marketed commercially.
Could be interesting to experiment with, for the fun of it.

Henry, Cph.


----- Original Message ----- 
From: "Henry Mei'l's" <meils at get2net.dk>
To: <arc5 at mailman.qth.net>
Sent: Saturday, November 13, 2010 9:17 AM
Subject: [ARC5] Fw: Crystal Question


> Now I'm even spelling my name wrong! I can console myself with the adage
> "Consistancy is the bugaboo of small minds."
> HenRy, Cph.
>
> ----- Original Message ----- 
> From: "Henry Mei'l's" <meils at get2net.dk>
> To: "Discussion of AN/ARC-5 military radio equipment."
> <arc5 at mailman.qth.net>
> Sent: Saturday, November 13, 2010 9:12 AM
> Subject: Re: [ARC5] Crystal Question
>
>
>> Dennis,
>>
>> I found an interesting article about Fessenden, via Google.
>> His elecrtrolytic detector is mentioned, but no specifics about
>> frequencies -- maybe a more thourough search would answer
>> that question.
>>
>> Heny, OZ1UF-OU5T / N2NR
>>
>> ----- Original Message ----- 
>> From: "Dennis Monticelli" <dennis.monticelli at gmail.com>
>> To: "Discussion of AN/ARC-5 military radio equipment."
>> <arc5 at mailman.qth.net>
>> Cc: <jfor at quik.com>
>> Sent: Saturday, November 13, 2010 7:44 AM
>> Subject: Re: [ARC5] Crystal Question
>>
>>
>>> You're right, Michael.  I did forget about Fessenden's Liquid Barretter.
>>> It
>>> was used at VLF.  I wonder how it would perform today applied to the 
>>> BCB,
>>> which is 10X the freq of those early transmitters.  Any body tried it?
>>>
>>> Dennis AE6C
>>>
>>> On Fri, Nov 12, 2010 at 9:07 AM, Michael A. Bittner <mmab at cox.net> 
>>> wrote:
>>>
>>>> Don't forget the electrolytic detectors of  Reginald Fessenden.  Mike,
>>>> W6MAB
>>>>
>>>>  ----- Original Message -----
>>>>  From: Dennis Monticelli
>>>>  To: jfor at quik.com ; Discussion of AN/ARC-5 military radio equipment.
>>>>  Sent: Friday, November 12, 2010 9:02 AM
>>>>  Subject: Re: [ARC5] Crystal Question
>>>>
>>>>
>>>>   Not only rain gutters but wire fencing or decrepid old TV antennas or
>>>> any
>>>>  long metal run that has metal-to-metal mechanical contacts along the
>>>> way
>>>>  that corrode upon exposure to reactive elements in the atmosphere.
>>>> Nearby
>>>>  AM BCB antennas are the usual source of the fundamental energy.  I
>>>> recently
>>>>  experienced terrible mixing products in my HF receivers that took 
>>>> weeks
>>>> to
>>>>  track down.  It turned out to be a hairline broken connection at the
>>>>  feedpoint of one of my wire antennas. The wire was copperweld and the
>>>>  connection was covered with RTV.  All looked well from the outside and
>>>> in
>>>>  trasmit the SWR was just fine as the large signal crashed right across
>>>> the
>>>>  gap.  But inside was a barely touching joint that had failed due to
>>>> fatigue
>>>>  and in receive it made a great Schottky detector.
>>>>
>>>>  I think the liquid electrolyte rectifiers of old were used in the 
>>>> early
>>>>  power supplies.  The speed of ion transport in solution was probably
>>>> too
>>>>  slow to be useful as an RF detector.
>>>>
>>>>  Dennis AE6C
>>>>
>>>>  On Fri, Nov 12, 2010 at 8:01 AM, J. Forster <jfor at quik.com> wrote:
>>>>
>>>>  > > Good Morning (UTC +1 time),
>>>>  > >
>>>>  > > Re my comment yestereday about metal-on metal
>>>>  > > rectifying RF:
>>>>  > > One of my experiments was using the contacts
>>>>  > > on my J-38 and home brew keys as detector
>>>>  > > by adjusting the spacing so that the
>>>>  > > oxidized contact surfaces barely made contact.
>>>>  > >
>>>>  > > On the more curious side, some have experienced
>>>>  > > having there tooth fillings function as detectors of broadcast
>>>>  > > signals.
>>>>  > >
>>>>  > > One of the causes of TVI often seen in densely populated areas
>>>>  > > is the fact that overlapping metal objects (e.g. rain gutters) not
>>>>  > > having good galvanic connection will rectify RF transmissions
>>>>  > > and create harmonics.
>>>>  >
>>>>  >
>>>>  > This is certainly true. A friend lives near a few powerful AM
>>>> stations
>>>> and
>>>>  > gets third order mixing products all the time. He has spent weeks
>>>> chasing
>>>>  > then down.
>>>>  >
>>>>  > Best,
>>>>  >
>>>>  > -John
>>>>  >
>>>>  > ==============
>>>>  >
>>>>  >
>>>>  > > BTW didn't early radio detectors also include liquid electrolytic
>>>>  > > solutions?
>>>>  > >
>>>>  > > Henry, Cph.
>>>>  >
>>>>  >
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