O.T. Step Potential ...

[Arfa Daily]

"Smitty Two" <prestwhich@earthlink.net> wrote in message
newsrestwhich-40B08E.20105715042008@news.phx.highwinds-media.com...

In article <lt5Nj.45983$Ff4.41645@newsfe5-win.ntli.net>,
"Arfa Daily" <arfa.daily@ntlworld.com> wrote:

Bear Grylls could do it too ! Do you get his TV shows there ? He's an ex
British Special Services survival specialist, and he's a sort of cross
between an escaped mental patient, and Steve Irwin ... Totally mad, but
full
of *really* useful and practical nuggets of survival technique. He really
is
the sort of bloke that you would want with you, if you found yourself
somewhere really inhospitable ...

Yeah, he's here. Um, I know it's bad form to denigrate the dead, but are
you implying that Steve Irwin *wasn't* an escaped mental patient?

Maybe I'm delusional, but somehow I don't think I'm going to be walking
down an unfamiliar street in a foreign city, take a wrong turn, and find
myself in the middle of a simmering lava field... so I might never need
a friend like Bear.

Ah, but one day, you might be taking a well earned vacation, and have your
plane come down in deepest Alaska in the winter (it got blown off course,
and couldn't spot its own navigational problems, because by then, lead-free
solder had crept into avionics, and a tin whisker had compromised the
primary navigation computer in such a way as not to be spotted by the pilot
:~} ) and only you and one other guy survive. Bet you'd be glad then that
you were sitting next to Bear ... !!

Arfa

 

[Arfa Daily]

"Smitty Two" <prestwhich@earthlink.net> wrote in message
newsrestwhich-40B08E.20105715042008@news.phx.highwinds-media.com...

In article <lt5Nj.45983$Ff4.41645@newsfe5-win.ntli.net>,
"Arfa Daily" <arfa.daily@ntlworld.com> wrote:

Bear Grylls could do it too ! Do you get his TV shows there ? He's an ex
British Special Services survival specialist, and he's a sort of cross
between an escaped mental patient, and Steve Irwin ... Totally mad, but
full
of *really* useful and practical nuggets of survival technique. He really
is
the sort of bloke that you would want with you, if you found yourself
somewhere really inhospitable ...

Yeah, he's here. Um, I know it's bad form to denigrate the dead, but are
you implying that Steve Irwin *wasn't* an escaped mental patient?

Maybe I'm delusional, but somehow I don't think I'm going to be walking
down an unfamiliar street in a foreign city, take a wrong turn, and find
myself in the middle of a simmering lava field... so I might never need
a friend like Bear.

Ah, but one day, you might be taking a well earned vacation, and have your
plane come down in deepest Alaska in the winter (it got blown off course,
and couldn't spot its own navigational problems, because by then, lead-free
solder had crept into avionics, and a tin whisker had compromised the
primary navigation computer in such a way as not to be spotted by the pilot
:~} ) and only you and one other guy survive. Bet you'd be glad then that
you were sitting next to Bear ... !!

Arfa

 

[Arfa Daily]

"bz" <bz+ser@ch100-5.chem.lsu.edu> wrote in message
news:Xns9A8180F4338D5WQAHBGMXSZHVspammote@130.39.198.139...

"N_Cook" <diverse@tcp.co.uk> wrote in
news:fu1st2$i9g$1@registered.motzarella.org:

Arfa Daily <arfa.daily@ntlworld.com> wrote in message
news:epSMj.354$DQ3.262@newsfe1-win.ntli.net...
Sorry all. O.T. as a repair issue. Just something I read about today
that
I'm not sure I understand.

Anybody come across the term "step potential" or its effect in regard
to a downed live power line in contact with the ground ?

Arfa



Hollywood versions show the severed end of the cable, in intermittant
contact with the ground, snaking about like an unsupported hosepipe
issuing a water jet, - true, I don't know ?

Seen it. I was at a gas station north of LSU one day when linemen were
working to straighten a power pole.
They were tightening a guy wire when the winch slipped.

The pole snapped back to 'relaxed position' (about a 3 degree lean) and
the
impulse traveled down the power lines.

The power lines started swinging to-and-fro. The linemen ran. I didn't
know
why.

The wires touched on a swing and arced. Bzzzzzt. A loud, rough, 60 Hz
note.

The arc cut the wire.
The hot wire dropped onto the pavement and started jumping around,
sparking
and buzzing at each contact.

I am standing about 50 feet away, putting gas in my car.
Cars on the street are slamming on their brakes and dodging the hot wire.

Finally, the circuit breaker tripped, killing the power.

THEN I had time to be scared.

I suspect the jumping is due to the magnetic field caused by the current
flow.
One section of the wire attracts or repels another, nearby section of the
same wire.


--
bz 73 de N5BZ k

I don't know about that. I think that it might be due to the force of the
mini-explosion - i.e. expanding air blast - each time it touches. The only
reason I say this is because I saw something a couple of weeks back, that in
35 years of service work, I had never seen before. I had a switch-mode power
supply on the bench. An internal one from an LCD TV. The design has a PFC
boost converter stage on the fron end. When working correctly, it shoud
produce 390v across the main filter cap for all input voltages from a
hundred or so, up. The filter cap is laid on its side, soldered to two pins.
When I powered this one, it was going "CRACK - CRACK - CRACK" very loud. It
took me by surprise, but I quickly turned off and checked for any sign of
arcing. There was none, so I covered my eyes, and turned back on. The main
filter cap should be stuck down to the board, but they have always broken
free on these boards, so are secured just by being soldered to the pins. On
this one, when I looked closer, the cap was bouncing with each "CRACK !" It
was in fact arcing internally with enough force to physically move it - and
it's not a small cap. The reason was that the regulation feedback on this
converter had failed, and there was over 700v across the cap ...

Arfa

 

[Arfa Daily]

"bz" <bz+ser@ch100-5.chem.lsu.edu> wrote in message
news:Xns9A8180F4338D5WQAHBGMXSZHVspammote@130.39.198.139...

"N_Cook" <diverse@tcp.co.uk> wrote in
news:fu1st2$i9g$1@registered.motzarella.org:

Arfa Daily <arfa.daily@ntlworld.com> wrote in message
news:epSMj.354$DQ3.262@newsfe1-win.ntli.net...
Sorry all. O.T. as a repair issue. Just something I read about today
that
I'm not sure I understand.

Anybody come across the term "step potential" or its effect in regard
to a downed live power line in contact with the ground ?

Arfa



Hollywood versions show the severed end of the cable, in intermittant
contact with the ground, snaking about like an unsupported hosepipe
issuing a water jet, - true, I don't know ?

Seen it. I was at a gas station north of LSU one day when linemen were
working to straighten a power pole.
They were tightening a guy wire when the winch slipped.

The pole snapped back to 'relaxed position' (about a 3 degree lean) and
the
impulse traveled down the power lines.

The power lines started swinging to-and-fro. The linemen ran. I didn't
know
why.

The wires touched on a swing and arced. Bzzzzzt. A loud, rough, 60 Hz
note.

The arc cut the wire.
The hot wire dropped onto the pavement and started jumping around,
sparking
and buzzing at each contact.

I am standing about 50 feet away, putting gas in my car.
Cars on the street are slamming on their brakes and dodging the hot wire.

Finally, the circuit breaker tripped, killing the power.

THEN I had time to be scared.

I suspect the jumping is due to the magnetic field caused by the current
flow.
One section of the wire attracts or repels another, nearby section of the
same wire.


--
bz 73 de N5BZ k

I don't know about that. I think that it might be due to the force of the
mini-explosion - i.e. expanding air blast - each time it touches. The only
reason I say this is because I saw something a couple of weeks back, that in
35 years of service work, I had never seen before. I had a switch-mode power
supply on the bench. An internal one from an LCD TV. The design has a PFC
boost converter stage on the fron end. When working correctly, it shoud
produce 390v across the main filter cap for all input voltages from a
hundred or so, up. The filter cap is laid on its side, soldered to two pins.
When I powered this one, it was going "CRACK - CRACK - CRACK" very loud. It
took me by surprise, but I quickly turned off and checked for any sign of
arcing. There was none, so I covered my eyes, and turned back on. The main
filter cap should be stuck down to the board, but they have always broken
free on these boards, so are secured just by being soldered to the pins. On
this one, when I looked closer, the cap was bouncing with each "CRACK !" It
was in fact arcing internally with enough force to physically move it - and
it's not a small cap. The reason was that the regulation feedback on this
converter had failed, and there was over 700v across the cap ...

Arfa

 

A client has an RCA D52W19B with the ITC222 chassis.

Previous repairs have involved patching a cold solder joint on CL031,
which had endured horrendous amounts of arcing since CL031 is a high
voltage capacitor (.0087 microfarads at 1600 VDC). Capacitor was not
replaced.

CP150 (2200 microfarads at 16 VDC) was replaced as the capacitor was
visibly defective with bulging of the can (stupid Chinese/Taiwanese
capacitor manufacturers; the capacitor in question was made by Lelon,
which is one of many also responsible for faulty computer motherboard
capacitors).

Currently, the set has a tendency to shut down and not power up when
being used after being off overnight. The power LED comes on for a
few seconds, then goes off, and then repeats a couple of more times
before not doing anything at all. After a few moments, the set is
able to be powered up again, only to shut down again after a little
while longer at running. Then, after another few moments, the set
powers on and seems to stay on.

I suspect the replacement I used for CP150 could be bad.

I am also thinking that CL031 might have sustained damage from heat
associated with the arcing and should have been replaced, except I
cannot find any place that sells this part, including online sources
such as DigiKey.

Client doesn't want to buy a new TV. She bought this one because of
the RCA name, not knowing that it largely stopped meaning anything
after the late 1980's.

Any solutions?

And, which seems typical with quite a few Thomson-designed RCA chassis
I've seen, this thing sucks in terms of its layout and parts quality.

 

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[msg]

Arfa Daily wrote:
<snip>

Now, I can see what the article (and you) are saying, but what I didn't
understand was the mechanism that caused these "expanding concentric
circles" of potential difference,

Does the article imply or depict a non-linear potential gradient?

which would be close enough together -
what's the length of a step, 45cm (18"") perhaps? - to allow you to step on
two of them together. At what speed are they expanding ? Presumably, slowly
enough to allow you to step on two for long enough to fry you ? Or has the
person writing the article, or the artist, got it basically wrong, or are
attempting to over-simplify or create a non-realistic model that might
better allow a semi-layman to understand the concept?

I would expect that all of this would be highly dependent on soil
conductivity and the underlying geology and that models must exist for
a variety of soil types, locations and conditions as this must be
a topic of importance to utility companies and insurers. In
rural areas where "stray voltage" complaints are encountered, the
utilities must have some good data. I suspect that natural resource
exploration businesses also have data and instrumentation.

The essential concern is for a high radial potential gradient from the
point of the downed line; I wonder if there are electrolysis effects
that would decrease soil resistance over time that could cause
an "expanding" gradient.

Michael

 

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[carlosB]

Does anyone have the unlock code / region free code for this DVD?
(Sony DVP-NS700h/B). Any tip will help.

Thanx.

CarlosB

 

[Terryc]

Michael A. Terrell wrote:

That description is more than simplistic, it is completely wrong.
There are usually more that one good ground path, so you can have a
gradient even if you walked in perfect circles. It all boils down to
Ohm's law, and the current path to every point that is well grounded.
If you have no other choice, you want to take as small of a step as
possible, but a pair of dry shoes add a lot of protection. It's possible
that the ground might only be 10 feet from where the wire touches the
ground. If that is a 7200 volt line, that would be 720 volts/foot. In
that case you would get a shock, even if you are standing on one foot.

Shock as in muscular contraction in the foot?

 

[Michael A. Terrell]

Terryc wrote:

Michael A. Terrell wrote:

That description is more than simplistic, it is completely wrong.
There are usually more that one good ground path, so you can have a
gradient even if you walked in perfect circles. It all boils down to
Ohm's law, and the current path to every point that is well grounded.
If you have no other choice, you want to take as small of a step as
possible, but a pair of dry shoes add a lot of protection. It's possible
that the ground might only be 10 feet from where the wire touches the
ground. If that is a 7200 volt line, that would be 720 volts/foot. In
that case you would get a shock, even if you are standing on one foot.

Shock as in muscular contraction in the foot?

Yes. Enough to knock you to the ground and expose you to a higher
gradient. One that will be fatal.


--
aioe.org is home to cowards and terrorists

Add this line to your news proxy nfilter.dat file
* drop Path:*aioe.org!not-for-mail to drop all aioe.org traffic.

http://improve-usenet.org/index.html


Use any search engine other than Google till they stop polluting USENET
with porn and junk commercial SPAM

 

[Michael A. Terrell]

James Sweet wrote:

"Michael A. Terrell" <mike.terrell@earthlink.net> wrote in message
news:38mdnUryfM8D-ZjVnZ2dnUVZ_qelnZ2d@earthlink.com...

ChrisCoaster wrote:

It's like trying to pick out a conversation in an AIR-RAID SIREN
FACTORY!!!

Google should have some filter options so we can eliminate at least
some of these advertisements for fake Swiss watches, "Pleather"
suitases and other crap!


You just don't get it. Google is the source of all that crap, and the
longer it takes you to wade through the crap, the more money they get
for their paid advertising that is on every page you go to. If you want
to get rid of the crap dump Google groups and get an account on a real
news server.



You may as well preach that to a pile of rocks, I doubt many people who are
still using google groups are ever gonna figure it out.

They will, when everyone killfilkes everything from google groups. I
am already flagging all the messages with News Proxy. All I have to do
is change the filter from flag to drop and I'll never see any of them
again. They are like the brain damaged idiots who try to convince you
that their WebTV is better than a computer.


--
aioe.org is home to cowards and terrorists

Add this line to your news proxy nfilter.dat file
* drop Path:*aioe.org!not-for-mail to drop all aioe.org traffic.

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Use any search engine other than Google till they stop polluting USENET
with porn and junk commercial SPAM

If you have broadband, your ISP may have a NNTP news server included in
your account: http://www.usenettools.net/ISP.htm

 

=
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=?windows-1252?Q?_in_a_distinctive_metal_case=2C_as_well_as_a_more_flashy_yellow?=
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From: watches0801@global-replica-watch.com
Date: Sun, 20 Apr 2008 00:30:17 -0700 (PDT)
Message-ID: <549357e1-9c2f-4d44-80b0-dee5c041b5fc@z24g2000prf.googlegroups.com>
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Newsgroups: sci.electronics.repair
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SV1),gzip(gfe),gzip(gfe)
Xref: sp12lax.superfeed.net sci.electronics.repair:98361

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[Michael A. Terrell]

maarten@panic.xx.tudelft.nl wrote:

Tim Phipps <news@timphipps.co.invalid> wrote:
I'm not a professional repairer but I've done a few motherboards. I
found it wasn't so much getting the old caps out but clearing the holes
afterwards was the problem. The non-groundplane side would normally
clear with the iron on one side and solder sucker on the other but the
groundplane hole was a real pain. I ended up using a sewing needle
whilst heating the hole (with a basic Antex 25w iron!!).

Use an iron of at least 50 watts, and suck it out using wick.

A good vacuum desoldering iron is better.


--
http://improve-usenet.org/index.html


Use any search engine other than Google till they stop polluting USENET
with porn and junk commercial SPAM

If you have broadband, your ISP may have a NNTP news server included in
your account: http://www.usenettools.net/ISP.htm

 

[Graham]

On Apr 19, 3:48 pm, Baron <baron.nos...@linuxmainiac.nospam.net>
wrote:

captainvideo462...@yahoo.com wrote:
I have a need for a power meter for general low band and VHF work. I
would like it to have at least two scales. One,  a 0 - 10 W or so
scale and if possible another which would enable it to measure up to
around 125 W as well. The immediate need to satisfy the requirements
of a job we're doing is for an instrument that can measure 1.0 W at
72.0 MHZ. The signal is AM with a duration of .50 sec. and there is
some type of digital alarm transmission which modulates the carrier.
The only way I think that I can do this now is to measure the RMS
voltage accross a 52 ohm dummy load with my Boonton, and then
calculate the power. I feel though that this is clumsy and may be
potentially inaccurate. I'd love to have a Bird with all the bells and
whistles but I really can't afford one. Does anyone know of a home
brew project for doing this or even an inexpensive accurate kit?
Thanks, Lenny.

If you have a "Boonton" why arn't you using it ?

--
Best Regards:
                     Baron.

This is just the thing , analouge vswr bridge head , with conditioning
amps , just need to measure the o/p voltage, with
what ever , job done

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