[ARC5] Crystal Question

[Henry Mei'l's]

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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