[ARC5] Crystal Question

[Leslie Smith]

Dennis/John:
Good example, good response.  Most informative.  Thanks vy much.

Les


> ----- Original Message -----
> From: "J. Forster" <jfor at quik.com>
> To: "Dennis Monticelli" <dennis.monticelli at gmail.com>
> Cc: "Discussion of AN/ARC-5 military radio equipment." <arc5 at mailman.qth.net>
> Subject: Re: [ARC5] Crystal Question
> Date: Fri, 12 Nov 2010 09:18:12 -0800 (PST)
> 
> 
> A shielded current loop and portable SW receiver ids the easiest way to
> track them down.
> 
> -John
> 
> =============
> 
> > 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.
> >>
> >>
> >>  ______________________________________________________________
> >> ARC5 mailing list
> >> Home: http://mailman.qth.net/mailman/listinfo/arc5
> >> Help: http://mailman.qth.net/mmfaq.htm
> >> Post: mailto:ARC5 at mailman.qth.net
> >>
> >> This list hosted by: http://www.qsl.net
> >> Please help support this email list: http://www.qsl.net/donate.html
> >>
> >
> 
> 
> ______________________________________________________________
> ARC5 mailing list
> Home: http://mailman.qth.net/mailman/listinfo/arc5
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:ARC5 at mailman.qth.net
> 
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html

>


-- 
_______________________________________________
Surf the Web in a faster, safer and easier way:
Download Opera 9 at http://www.opera.com