[ARC5] Fw: Crystal Question
Henry Mei'l's
meils at get2net.dk
Sat Nov 13 03:17:36 EST 2010
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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