Never claimed to be a master of the english language :-). I was
attempting to distinguish between two arc's I had on a utility pole
causing rfi. One was "stronger" (about 25+db over S9 on 80m) vs the
weaker one which was barely heard on 80m due to natural noise levels but
could be heard on the upper bands. Visually both were tiny arc's but
both could be seen with binoculars in the dark. The "stronger" one was
fairly easy to see with binoculars. The other not so much but I could
see it better with a spotting scope. Neither would conjure up visions of
Tesla. Hope that helps.
Chuck
W4NBO
On 5/9/21 12:00 PM, Joe Locascio via RFI wrote:
WHAT is a 'strong arc'???
Joe
On Sunday, May 9, 2021, 09:00:37 AM PDT, rfi-request@contesting.com
<rfi-request@contesting.com> wrote:
Send RFI mailing list submissions to
rfi@contesting.com
To subscribe or unsubscribe via the World Wide Web, visit
http://lists.contesting.com/mailman/listinfo/rfi
or, via email, send a message with subject or body 'help' to
rfi-request@contesting.com
You can reach the person managing the list at
rfi-owner@contesting.com
When replying, please edit your Subject line so it is more specific
than "Re: Contents of RFI digest..."
Today's Topics:
1. Re: Next step visually sighting arc's (David Eckhardt)
2. Re: Next step visually sighting arc's (Charles Plunk)
3. Radar Engineers Model 251 Parabolic dimensions? (Charlie Delta)
4. Re: Radar Engineers Model 251 Parabolic dimensions?
(n0tt1@juno.com)
5. Fwd: RE250 Sighting? (Charles Plunk)
----------------------------------------------------------------------
Message: 1
Date: Sat, 8 May 2021 16:48:19 +0000
From: David Eckhardt <davearea51a@gmail.com>
To: Charles Plunk <af4o@twc.com>
Cc: "rfi@contesting.com" <rfi@contesting.com>
Subject: Re: [RFI] Next step visually sighting arc's
Message-ID:
<CAODdWWE0tJP1pRHH_6-2KVuukKroZyQxM0adkB==asj045DfWg@mail.gmail.com>
Content-Type: text/plain; charset="UTF-8"
Instead of the 'rifle' scope, I'd suggest something a bit more capable with
a larger aperture. I have the Celestron Ultima 65 used for this purpose
and many others. The 65 mm objective is excellent, it can be either
hand-held or tripod mounted, and costs a bit less than twice your 'rifle'
scope (in the $100 to $150 range, store dependent).
Dave - W?LEV
On Sat, May 8, 2021 at 3:13 PM Charles Plunk <af4o@twc.com> wrote:
As you may remember, I sighted my first strong arc with binoculars after
triangulation, ultrasonic, etc. Its been fixed by the util for over a
month and still gone gone :-)
A not near as strong arc is on the same pole but on the opposite side.
This pole is in the corner of my backyard so makes it convenient to
experiment with. Playing with the success of the first, I tried
binoculars and thought, with some imagination that I could see this arc
too. Its tiny.
So, I bought a stronger spotting scope, like you sight in rifles with.
And mounted it on a tripod. Last night the source was active and still
think I see it in the same spot. A crusty old ground lug wired to the
bottom of a fused disconnect. Connects to the wire stapled to the pole.
One has to be careful as reflections off the ceramics from distant
street lights (~200' away) can look like arc's. But a crusty ground lug
should not reflect. This area is also where I hear it with ultrasonic.
Its a very narrow place to stand on the ground to hear it with
ultrasonic. Another issue is its so dark its hard to make out the
outlines of the pole in the dark to tell where you are seeing. But I
could see enough. The bigger the lens on the front of the
scope/binoculars the better to capture more light to see the pole I
suppose.
My experiments so far with digital cameras, one with the IR/UV filters
removed, have resulted in failure. Cannot even see the pole in the dark.
Nothing but a grainy picture. Even trying to capture a picture through
the scope. The scope came with a phone mount for capture.
I am going to look at the same spot when the source is inactive. If the
suspected tiny arc is absent then going to request the util replace that
connector unless anyone has any further suggestions.
The spotting scope I bought was ~$60 so another low cost tool maybe for
your rfi toolbox.
Underneath this one, at night I am hearing a repetitive noise. One
minute on ~0.5 - 4 seconds off. But thats another story, lol and does
not sound like power line arc.
Chuck
W4NBO
_______________________________________________
RFI mailing list
RFI@contesting.com
http://lists.contesting.com/mailman/listinfo/rfi
_______________________________________________
RFI mailing list
RFI@contesting.com
http://lists.contesting.com/mailman/listinfo/rfi
|