Tv reception

On 6/02/2017 11:32 AM, ~misfit~ wrote:
Once upon a time on usenet felix wrote:
On Sunday, 5 Feb 2017 7:09 PM, Petzl wrote:
On Sun, 5 Feb 2017 18:25:32 +1100, F Murtz <haggisz@hotmail.com
wrote:

Petzl wrote:
On Sun, 5 Feb 2017 13:51:41 +1100, F Murtz <haggisz@hotmail.com
wrote:

Computer Nerd Kev wrote:
In aus.electronics F Murtz <haggisz@hotmail.com> wrote:
For months I have been having problems with tv reception TV not
working on most channels for hours, I have been blaming 4g
towers, fixed wireless towers etc that have just been put up
etc. I have just found the cause by accident, almost unbelievable.
TV does not work if the kitchen light is on.
The culprit is one of these, a 12" or so multiple led ceiling LED
similar to this,
http://imgur.com/a/dj5ha
I wish I could put down my TV reception's bad stints to something
like that. I ususally mumble something nasty about digital TV
when it happens because the "all or nothing" consequence of a
weak digital signal makes the whole experiance so much more
annoying than the bit of noise that might have appeared in
analogue reception.

It's funny how reception can be bad for a week or more then fine
for months afterwards, or only dodgy on a few nights. Probably
something to do with atmospheric conditions. Maybe I should
look at the atmosphere monitor webpages that the ham radio
people use next time there's a long stint of trouble.

The transmitter's around 70Km away.

I always have had minor glitches that I put down to the weather
but this was almost all or nothing.
"F Murtz" you know your nearest transmiter is Razorback straight
line 10 Klm away
https://is.gd/EVehQL

https://www.digitaltvhelp.com.au/digital-tv-antenna-capital-cities/#sydney

Yes, and lots of trees in between.
Have you got a dedicated digital TV antenna?
My place is also a home amongst the gum trees.

digital antennas need 'line of sight'

I thought that too until the installer faced mine up at an angle to catch
the signal bounced off the troposphere (?).
Click to expand...
VHF and UHF also have a degree of diffraction that will alter the
equation somewhat.

http://hdtvprimer.com/antennas/siting.html


--

Xeno

First they ignore you,
Then they ridicule you,
Then they fight you,
Then you win.

Mahatma Ghandi
 
On Mon, 6 Feb 2017 03:52:29 +1100, "Rod Speed"
<rod.speed.aaa@gmail.com> wrote:

"Petzl" <petzlx@gmail.com> wrote in message
news:v95e9chkbb8hbiq6fpnkedovsbbsngkpai@4ax.com...
On Sun, 5 Feb 2017 19:58:21 +1100, "Rod Speed"
rod.speed.aaa@gmail.com> wrote:



"Petzl" <petzlx@gmail.com> wrote in message
news:h9nd9clav36cj3ceolkdf9508j3b4eugq9@4ax.com...
On Sun, 5 Feb 2017 18:25:32 +1100, F Murtz <haggisz@hotmail.com
wrote:

Petzl wrote:
On Sun, 5 Feb 2017 13:51:41 +1100, F Murtz <haggisz@hotmail.com
wrote:

Computer Nerd Kev wrote:
In aus.electronics F Murtz <haggisz@hotmail.com> wrote:
For months I have been having problems with tv reception TV not
working
on most channels for hours, I have been blaming 4g towers, fixed
wireless towers etc that have just been put up etc.
I have just found the cause by accident, almost unbelievable.
TV does not work if the kitchen light is on.
The culprit is one of these, a 12" or so multiple led ceiling LED
similar to this,
http://imgur.com/a/dj5ha

I wish I could put down my TV reception's bad stints to something
like that. I ususally mumble something nasty about digital TV when
it happens because the "all or nothing" consequence of a weak
digital signal makes the whole experiance so much more annoying
than the bit of noise that might have appeared in analogue
reception.

It's funny how reception can be bad for a week or more then fine
for months afterwards, or only dodgy on a few nights. Probably
something to do with atmospheric conditions. Maybe I should
look at the atmosphere monitor webpages that the ham radio
people use next time there's a long stint of trouble.

The transmitter's around 70Km away.

I always have had minor glitches that I put down to the weather but
this
was almost all or nothing.

"F Murtz" you know your nearest transmiter is Razorback straight line
10 Klm away
https://is.gd/EVehQL

https://www.digitaltvhelp.com.au/digital-tv-antenna-capital-cities/#sydney

Yes, and lots of trees in between.

Have you got a dedicated digital TV antenna?

No such animal.

Well my analogue one was 3 metres above the top of the roof
The digital one is tacked to the "barge board" the gutter is on,
about a metre high

Mine always as and isnt even that high.

but really small.

That's because its UHF only, not VHF.

Reception is excellent.

Yeah, that's because its digital. Plenty who couldn't get a
decent result with an internal antenna can now with digital.

My place is also a home amongst the gum trees.

So is mine, but they arent on the side where the TV transmitters are.

Then if need be there are Sydney transmitters 180 degrees in reverse

We never had that here, 90 degrees different at one time.
Click to expand...

In Sydney's Southwest a legacy issue was the transmitters were in
"North Shore" (we aimed at CentrePoint tower) but now there is a
transmitter a lot closer in Razorback
https://is.gd/NCHq5Z
Although I had the aerial installer aim at Sydney's transmitter, in
the belief if something goes wrong they a fixed quick, Razorback I
suspect would take weeks.

Digital does not pick up the interference the analogue aerials did.

Getting digital on analogue was a arse, vacuum cleaner, computer
almost everything blanked reception.
--
Petzl
Arguing with a woman is like reading the Software License Agreement.
In the end, you ignore everthing and click "I agree"
 
On 06-Feb-17 4:51 AM, Benderthe.evilrobot wrote:
"F Murtz" <haggisz@hotmail.com> wrote in message
news:5895e20f$0$55943$b1db1813$65575428@news.astraweb.com...
Lucifer Morningstar wrote:
On Sat, 4 Feb 2017 23:49:55 +1100, F Murtz <haggisz@hotmail.com
wrote:

For months I have been having problems with tv reception TV not working
on most channels for hours, I have been blaming 4g towers, fixed
wireless towers etc that have just been put up etc.
I have just found the cause by accident, almost unbelievable.
TV does not work if the kitchen light is on.
The culprit is one of these, a 12" or so multiple led ceiling LED
similar to this,
http://imgur.com/a/dj5ha

My electric fence was interfering with my TV reception.

If I had an electric fence that would be one of the first suspects but
who would think turning a light on would cause it,

Its been a possible problem with CFLs for years.

Some of the LED replacement bulbs use a wattless dropper instead of
SMPSU circuitry. You might be able to adapt it, but don't forget to
include a surge limiting resistor - the current is very high around the
zero crossing portion of the AC waveform.

All the LED bulbs I've pulled apart had SMD resistors, so I didn't
bother tracing the schematic - there was a very handy CFL blog, maybe
LED bulbs have caught up.
Click to expand...

Can you enlighten us about that high current issue?
 
On 2017-02-05, F Murtz <haggisz@hotmail.com> wrote:
Benderthe.evilrobot wrote:

"Blue Peeler" <woof@barque.org> wrote in message
news:efn0c5FfbjlU1@mid.individual.net...
Lucifer Morningstar wrote:


My electric fence was interfering with my TV reception.


To clarify - was that the electronics in the fence generator, or the
screams of the victims that was intruding on your viewing pleasure?

Someone on one of the electronics forums was into urinating on electric
fences.............

Did not mythbusters do one on that?
Click to expand...

No, they did "third rail". you can easily get a lot closer to the active part
of a fence, and the voltage is significantly higher.

--
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Jasen Betts wrote:
On 2017-02-05, F Murtz <haggisz@hotmail.com> wrote:
Benderthe.evilrobot wrote:

"Blue Peeler" <woof@barque.org> wrote in message
news:efn0c5FfbjlU1@mid.individual.net...
Lucifer Morningstar wrote:


My electric fence was interfering with my TV reception.


To clarify - was that the electronics in the fence generator, or the
screams of the victims that was intruding on your viewing pleasure?

Someone on one of the electronics forums was into urinating on electric
fences.............

Did not mythbusters do one on that?

No, they did "third rail". you can easily get a lot closer to the active part
of a fence, and the voltage is significantly higher.
Click to expand...
This wasn't a revisiting as much as it was a variation. The myth the
first time around was that you could get shocked by peeing on an
electrified third rail. Their slow-motion video from the first time
showed that the stream breaks apart too much falling to the ground. This
time around they built an electric fence with small charge, which would
be closer to the person peeing. Once again, Adam volunteered as the
guinea pig and peed directly onto the fence. It was only a couple
seconds before he felt a little shock.
 
~misfit~ <shaun.at.pukekohe@gmail.com> wrote:
Once upon a time on usenet Computer Nerd Kev wrote:

If I'm the OP you're talking about, my aerial is designed for
digital. The installation was a DIY affair though (one person
on the roof, another watching the set-top box's signal level
menu). That procedure has been repeated a few times after the
wind's blown the antenna in the wrong direction - the mounting
design really isn't suited to the "watch the world blow by
your window" winds out here.

Not optimal, but it shouldn't be any worse than the set-up on
analogue.

I'm about 70kms from the transmitter also and the installer has my aerial
pointed upwards at about 30 degrees. I'd struggled going up and down a
ladder and turning the damn thing several times myself and not getting a
decent signal (but never thought to angle it upwards!) before discovering
that, being disabled I was entitled to a subsidised professional install.
Since it's been pointed up like that it's been great.
Click to expand...

Thanks. Unfortunately I just checked, and the aerial's design only allows
horizontal adjustment. Something to keep in mind though.

--
__ __
#_ < |\| |< _#
 
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"F Murtz" <haggisz@hotmail.com> wrote in message
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Lucifer Morningstar wrote:
On Sat, 4 Feb 2017 23:49:55 +1100, F Murtz <haggisz@hotmail.com
wrote:

For months I have been having problems with tv reception TV not
working
on most channels for hours, I have been blaming 4g towers, fixed
wireless towers etc that have just been put up etc.
I have just found the cause by accident, almost unbelievable.
TV does not work if the kitchen light is on.
The culprit is one of these, a 12" or so multiple led ceiling LED
similar to this,
http://imgur.com/a/dj5ha

My electric fence was interfering with my TV reception.

If I had an electric fence that would be one of the first suspects but
who would think turning a light on would cause it,

Its been a possible problem with CFLs for years.

Some of the LED replacement bulbs use a wattless dropper instead of SMPSU
circuitry. You might be able to adapt it, but don't forget to include a
surge limiting resistor - the current is very high around the zero
crossing portion of the AC waveform.

That's mad, the current will be very low around the zero crossing of the
AC waveform.
Click to expand...

Three words - "rate of change".
 
"Jasen Betts" <jasen@xnet.co.nz> wrote in message
news:eek:78ng6$orf$1@gonzo.alcatraz...
On 2017-02-05, F Murtz <haggisz@hotmail.com> wrote:
Benderthe.evilrobot wrote:

"Blue Peeler" <woof@barque.org> wrote in message
news:efn0c5FfbjlU1@mid.individual.net...
Lucifer Morningstar wrote:


My electric fence was interfering with my TV reception.


To clarify - was that the electronics in the fence generator, or the
screams of the victims that was intruding on your viewing pleasure?

Someone on one of the electronics forums was into urinating on electric
fences.............

Did not mythbusters do one on that?

No, they did "third rail". you can easily get a lot closer to the active
part
of a fence, and the voltage is significantly higher.
Click to expand...

Most of the UK rail network has been electrified with overhead lines, we
used to get the occasional report of drunks getting seriously injured by
urinating off bridges.

The bridge near me has had sheet steel welded over the railings over the
power lines.
 
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"F Murtz" <haggisz@hotmail.com> wrote in message
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Lucifer Morningstar wrote:
On Sat, 4 Feb 2017 23:49:55 +1100, F Murtz <haggisz@hotmail.com
wrote:

For months I have been having problems with tv reception TV not
working
on most channels for hours, I have been blaming 4g towers, fixed
wireless towers etc that have just been put up etc.
I have just found the cause by accident, almost unbelievable.
TV does not work if the kitchen light is on.
The culprit is one of these, a 12" or so multiple led ceiling LED
similar to this,
http://imgur.com/a/dj5ha

My electric fence was interfering with my TV reception.

If I had an electric fence that would be one of the first suspects but
who would think turning a light on would cause it,

Its been a possible problem with CFLs for years.

Some of the LED replacement bulbs use a wattless dropper instead of
SMPSU circuitry. You might be able to adapt it, but don't forget to
include a surge limiting resistor - the current is very high around the
zero crossing portion of the AC waveform.

That's mad, the current will be very low around the zero crossing of the
AC waveform.

Three words - "rate of change".
Click to expand...

It has nothing to do with rate of change, the voltage by definition
is close to zero, so the current is in fact very low. Ohms law.
 
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"F Murtz" <haggisz@hotmail.com> wrote in message
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Lucifer Morningstar wrote:
On Sat, 4 Feb 2017 23:49:55 +1100, F Murtz <haggisz@hotmail.com
wrote:

For months I have been having problems with tv reception TV not
working
on most channels for hours, I have been blaming 4g towers, fixed
wireless towers etc that have just been put up etc.
I have just found the cause by accident, almost unbelievable.
TV does not work if the kitchen light is on.
The culprit is one of these, a 12" or so multiple led ceiling LED
similar to this,
http://imgur.com/a/dj5ha

My electric fence was interfering with my TV reception.

If I had an electric fence that would be one of the first suspects but
who would think turning a light on would cause it,

Its been a possible problem with CFLs for years.

Some of the LED replacement bulbs use a wattless dropper instead of
SMPSU circuitry. You might be able to adapt it, but don't forget to
include a surge limiting resistor - the current is very high around the
zero crossing portion of the AC waveform.

That's mad, the current will be very low around the zero crossing of the
AC waveform.

Three words - "rate of change".

It has nothing to do with rate of change, the voltage by definition
is close to zero, so the current is in fact very low. Ohms law.
Click to expand...

Geez - and I thought I wasn't great at AC theory..........................

A coupling capacitor (wattless dropper) blocks DC, the AC waveform is almost
that at the peaks. The capacitor only passes a rate of change - that's at
its greatest around the zero crossing points.

Maybe you should lay off the booze (or whatever)........
 
On 07-Feb-17 5:15 AM, Benderthe.evilrobot wrote:
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"F Murtz" <haggisz@hotmail.com> wrote in message
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Lucifer Morningstar wrote:
On Sat, 4 Feb 2017 23:49:55 +1100, F Murtz <haggisz@hotmail.com
wrote:

For months I have been having problems with tv reception TV not
working
on most channels for hours, I have been blaming 4g towers, fixed
wireless towers etc that have just been put up etc.
I have just found the cause by accident, almost unbelievable.
TV does not work if the kitchen light is on.
The culprit is one of these, a 12" or so multiple led ceiling LED
similar to this,
http://imgur.com/a/dj5ha

My electric fence was interfering with my TV reception.

If I had an electric fence that would be one of the first suspects
but who would think turning a light on would cause it,

Its been a possible problem with CFLs for years.

Some of the LED replacement bulbs use a wattless dropper instead of
SMPSU circuitry. You might be able to adapt it, but don't forget to
include a surge limiting resistor - the current is very high around
the zero crossing portion of the AC waveform.

That's mad, the current will be very low around the zero crossing of
the AC waveform.

Three words - "rate of change".

It has nothing to do with rate of change, the voltage by definition
is close to zero, so the current is in fact very low. Ohms law.

Geez - and I thought I wasn't great at AC theory..........................

A coupling capacitor (wattless dropper) blocks DC, the AC waveform is
almost that at the peaks. The capacitor only passes a rate of change -
that's at its greatest around the zero crossing points.

Maybe you should lay off the booze (or whatever)........
Click to expand...

I have put such a circuit in a simulator, and except for the inrush
current I don't see anything like you said.
Try it yourself, like on: http://www.falstad.com/circuit/
Select 'File', 'import from text', and paste this text, a simple example:

$ 1 0.000005 3.452441195350251 45 5 43
s 688 96 752 96 0 0 false
v 752 368 752 96 0 1 50 330 0 0 0.5
d 480 352 480 240 1 0.805904783
d 576 112 576 208 1 0.805904783
w 688 96 576 96 0
w 576 96 576 112 0
w 480 96 576 96 0
w 480 352 480 368 0
d 416 144 416 96 1 0.805904783
d 416 272 416 352 1 0.805904783
w 480 96 416 96 0
w 416 352 416 368 0
w 432 368 480 368 0
370 688 368 752 368 1 0
162 480 224 480 160 1 2.1024259 1 0 0 0.01
162 512 224 512 160 1 2.1024259 1 0 0 0.01
162 544 224 544 160 1 2.1024259 1 0 0 0.01
w 480 144 480 160 0
w 480 160 512 160 0
w 512 160 544 160 0
w 544 224 512 224 0
w 512 224 480 224 0
w 432 144 416 144 0
c 560 368 624 368 0 5e-7 -9.1361757825205
w 688 368 624 368 0
w 560 368 480 368 0
w 416 144 416 160 0
w 416 160 416 272 0
w 432 368 416 368 0
w 432 144 480 144 0
w 480 240 480 224 0
r 560 320 624 320 0 220000
w 560 320 560 368 0
w 624 320 624 368 0
w 576 208 576 224 0
w 480 240 576 240 0
w 576 240 576 224 0
o 1 64 0 2083 640 0.1 0 -1 0
o 30 64 0 2083 640 0.1 1 -1 0

You have to reset the simulation and start again do get the current
range to normal after the inrush.
AFAIK The only important thing to remember is to use at least an X3
rated capacitor and a discharge resistor across the cap, so yo don't get
zapped when touching the open pins.
 
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"F Murtz" <haggisz@hotmail.com> wrote in message
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Lucifer Morningstar wrote:
On Sat, 4 Feb 2017 23:49:55 +1100, F Murtz <haggisz@hotmail.com
wrote:

For months I have been having problems with tv reception TV not
working
on most channels for hours, I have been blaming 4g towers, fixed
wireless towers etc that have just been put up etc.
I have just found the cause by accident, almost unbelievable.
TV does not work if the kitchen light is on.
The culprit is one of these, a 12" or so multiple led ceiling LED
similar to this,
http://imgur.com/a/dj5ha

My electric fence was interfering with my TV reception.

If I had an electric fence that would be one of the first suspects
but who would think turning a light on would cause it,

Its been a possible problem with CFLs for years.

Some of the LED replacement bulbs use a wattless dropper instead of
SMPSU circuitry. You might be able to adapt it, but don't forget to
include a surge limiting resistor - the current is very high around
the zero crossing portion of the AC waveform.

That's mad, the current will be very low around the zero crossing of
the AC waveform.

Three words - "rate of change".

It has nothing to do with rate of change, the voltage by definition
is close to zero, so the current is in fact very low. Ohms law.

Geez - and I thought I wasn't great at AC theory..........................

A coupling capacitor (wattless dropper) blocks DC, the AC waveform is
almost that at the peaks. The capacitor only passes a rate of change -
that's at its greatest around the zero crossing points.
Click to expand...

Even sillier and more pig ignorant than you usually manage.
 
On Tue, 7 Feb 2017 17:36:04 +1100, F Murtz <haggisz@hotmail.com>
wrote:

F Murtz wrote:
Benderthe.evilrobot wrote:

"F Murtz" <haggisz@hotmail.com> wrote in message
news:5895cdf7$0$4415$b1db1813$145976f0@news.astraweb.com...
For months I have been having problems with tv reception TV not
working on most channels for hours, I have been blaming 4g towers,
fixed wireless towers etc that have just been put up etc.
I have just found the cause by accident, almost unbelievable.
TV does not work if the kitchen light is on.
The culprit is one of these, a 12" or so multiple led ceiling LED
similar to this,
http://imgur.com/a/dj5ha


With a metal cased unit you can get away with a ferrite collar on the
supply lead.

If you have to go inside - you can get split ferrite clamp on collars
that can be fitted without lifting any wires, the smaller sizes you're
likely to want are harder to find.

When the temp in the roof gets below the high fourties I might shift the
coax that must be passing near,and or try ferrite.

Just looked in roof, coax goes nowhere near light so ferrite at fitting
next, who knows where next if that does not work.
Click to expand...

Check your earth wire is working (earthed) if your Aerial is OK.
--
Petzl
Arguing with a woman is like reading the Software License Agreement.
In the end, you ignore everthing and click "I agree"
 
F Murtz wrote:
Benderthe.evilrobot wrote:

"F Murtz" <haggisz@hotmail.com> wrote in message
news:5895cdf7$0$4415$b1db1813$145976f0@news.astraweb.com...
For months I have been having problems with tv reception TV not
working on most channels for hours, I have been blaming 4g towers,
fixed wireless towers etc that have just been put up etc.
I have just found the cause by accident, almost unbelievable.
TV does not work if the kitchen light is on.
The culprit is one of these, a 12" or so multiple led ceiling LED
similar to this,
http://imgur.com/a/dj5ha


With a metal cased unit you can get away with a ferrite collar on the
supply lead.

If you have to go inside - you can get split ferrite clamp on collars
that can be fitted without lifting any wires, the smaller sizes you're
likely to want are harder to find.

When the temp in the roof gets below the high fourties I might shift the
coax that must be passing near,and or try ferrite.
Click to expand...

Just looked in roof, coax goes nowhere near light so ferrite at fitting
next, who knows where next if that does not work.
 
On 2017-02-06, ~misfit~ <shaun.at.pukekohe@gmail.com> wrote:
I'm about 70kms from the transmitter also and the installer has my aerial
pointed upwards at about 30 degrees. I'd struggled going up and down a
ladder and turning the damn thing several times myself and not getting a
decent signal (but never thought to angle it upwards!) before discovering
that, being disabled I was entitled to a subsidised professional install.
Since it's been pointed up like that it's been great.
Click to expand...

The angle's about right, but is there such a thing as stratosphere
bounce? or is the installer instead exploiting a side-lobe of the antenna?


--
This email has not been checked by half-arsed antivirus software
 
Petzl wrote:
On Tue, 7 Feb 2017 17:36:04 +1100, F Murtz <haggisz@hotmail.com
wrote:

F Murtz wrote:
Benderthe.evilrobot wrote:

"F Murtz" <haggisz@hotmail.com> wrote in message
news:5895cdf7$0$4415$b1db1813$145976f0@news.astraweb.com...
For months I have been having problems with tv reception TV not
working on most channels for hours, I have been blaming 4g towers,
fixed wireless towers etc that have just been put up etc.
I have just found the cause by accident, almost unbelievable.
TV does not work if the kitchen light is on.
The culprit is one of these, a 12" or so multiple led ceiling LED
similar to this,
http://imgur.com/a/dj5ha


With a metal cased unit you can get away with a ferrite collar on the
supply lead.

If you have to go inside - you can get split ferrite clamp on collars
that can be fitted without lifting any wires, the smaller sizes you're
likely to want are harder to find.

When the temp in the roof gets below the high fourties I might shift the
coax that must be passing near,and or try ferrite.

Just looked in roof, coax goes nowhere near light so ferrite at fitting
next, who knows where next if that does not work.

Check your earth wire is working (earthed) if your Aerial is OK.
Click to expand...
Everything worked (sort of, always a bit iffy in strange weather, better
when I raised aerial) for 4 years, suddenly all or nothing when light
installed (almost no tv when light on)
 
Once upon a time on usenet Jasen Betts wrote:
On 2017-02-06, ~misfit~ <shaun.at.pukekohe@gmail.com> wrote:

I'm about 70kms from the transmitter also and the installer has my
aerial pointed upwards at about 30 degrees. I'd struggled going up
and down a ladder and turning the damn thing several times myself
and not getting a decent signal (but never thought to angle it
upwards!) before discovering that, being disabled I was entitled to
a subsidised professional install. Since it's been pointed up like
that it's been great.

The angle's about right, but is there such a thing as stratosphere
bounce? or is the installer instead exploiting a side-lobe of the
antenna?
Click to expand...

I have no idea. All I know is that before, when I tried to use line-of-sight
(through a stand of large trees 500m away) the best signal I got would drop
out a lot. The installer hooked up a signal meter, turned it left and right
at first then angled it up. Since then even in bad weather the signal's rock
solid.
--
Shaun.

"Humans will have advanced a long, long way when religious belief has a cozy
little classification in the DSM*."
David Melville (in r.a.s.f1)
(*Diagnostic and Statistical Manual of Mental Disorders)
 
On Tue, 7 Feb 2017 18:38:22 +1100, F Murtz <haggisz@hotmail.com>
wrote:

Petzl wrote:
On Tue, 7 Feb 2017 17:36:04 +1100, F Murtz <haggisz@hotmail.com
wrote:

F Murtz wrote:
Benderthe.evilrobot wrote:

"F Murtz" <haggisz@hotmail.com> wrote in message
news:5895cdf7$0$4415$b1db1813$145976f0@news.astraweb.com...
For months I have been having problems with tv reception TV not
working on most channels for hours, I have been blaming 4g towers,
fixed wireless towers etc that have just been put up etc.
I have just found the cause by accident, almost unbelievable.
TV does not work if the kitchen light is on.
The culprit is one of these, a 12" or so multiple led ceiling LED
similar to this,
http://imgur.com/a/dj5ha


With a metal cased unit you can get away with a ferrite collar on the
supply lead.

If you have to go inside - you can get split ferrite clamp on collars
that can be fitted without lifting any wires, the smaller sizes you're
likely to want are harder to find.

When the temp in the roof gets below the high fourties I might shift the
coax that must be passing near,and or try ferrite.

Just looked in roof, coax goes nowhere near light so ferrite at fitting
next, who knows where next if that does not work.

Check your earth wire is working (earthed) if your Aerial is OK.

Everything worked (sort of, always a bit iffy in strange weather, better
when I raised aerial) for 4 years, suddenly all or nothing when light
installed (almost no tv when light on)
Click to expand...

I caved in when my TV became glitchy
Had the terracotta roof high pressure washed new gutters installed

THEN a new aerial perfect can now turn on computers anything no TV
problems
--
Petzl
Arguing with a woman is like reading the Software License Agreement.
In the end, you ignore everthing and click "I agree"
 
On 7/02/2017 6:38 PM, F Murtz wrote:
Petzl wrote:
On Tue, 7 Feb 2017 17:36:04 +1100, F Murtz <haggisz@hotmail.com
wrote:

F Murtz wrote:
Benderthe.evilrobot wrote:

"F Murtz" <haggisz@hotmail.com> wrote in message
news:5895cdf7$0$4415$b1db1813$145976f0@news.astraweb.com...
For months I have been having problems with tv reception TV not
working on most channels for hours, I have been blaming 4g towers,
fixed wireless towers etc that have just been put up etc.
I have just found the cause by accident, almost unbelievable.
TV does not work if the kitchen light is on.
The culprit is one of these, a 12" or so multiple led ceiling LED
similar to this,
http://imgur.com/a/dj5ha


With a metal cased unit you can get away with a ferrite collar on the
supply lead.

If you have to go inside - you can get split ferrite clamp on collars
that can be fitted without lifting any wires, the smaller sizes you're
likely to want are harder to find.

When the temp in the roof gets below the high fourties I might shift
the
coax that must be passing near,and or try ferrite.

Just looked in roof, coax goes nowhere near light so ferrite at fitting
next, who knows where next if that does not work.

Check your earth wire is working (earthed) if your Aerial is OK.

Everything worked (sort of, always a bit iffy in strange weather, better
when I raised aerial) for 4 years, suddenly all or nothing when light
installed (almost no tv when light on)
Click to expand...

No bad connections in the coax?

--

Xeno

First they ignore you,
Then they ridicule you,
Then they fight you,
Then you win.

Mahatma Ghandi
 
"Tony" <nomail@nospam.com> wrote in message
news:eek:7aul7$86n$1@dont-email.me...
On 07-Feb-17 5:15 AM, Benderthe.evilrobot wrote:

"Rod Speed" <rod.speed.aaa@gmail.com> wrote in message
news:efs442Fg7ciU1@mid.individual.net...


"Benderthe.evilrobot" <Benderthe.evilrobot@virginmedia.com> wrote in
message news:eo4mA.23709$8K.5710@fx46.am4...

"Rod Speed" <rod.speed.aaa@gmail.com> wrote in message
news:efphvdFdimU1@mid.individual.net...


"Benderthe.evilrobot" <Benderthe.evilrobot@virginmedia.com> wrote in
message news:sfMlA.195747$yv3.192638@fx30.am4...

"F Murtz" <haggisz@hotmail.com> wrote in message
news:5895e20f$0$55943$b1db1813$65575428@news.astraweb.com...
Lucifer Morningstar wrote:
On Sat, 4 Feb 2017 23:49:55 +1100, F Murtz <haggisz@hotmail.com
wrote:

For months I have been having problems with tv reception TV not
working
on most channels for hours, I have been blaming 4g towers, fixed
wireless towers etc that have just been put up etc.
I have just found the cause by accident, almost unbelievable.
TV does not work if the kitchen light is on.
The culprit is one of these, a 12" or so multiple led ceiling LED
similar to this,
http://imgur.com/a/dj5ha

My electric fence was interfering with my TV reception.

If I had an electric fence that would be one of the first suspects
but who would think turning a light on would cause it,

Its been a possible problem with CFLs for years.

Some of the LED replacement bulbs use a wattless dropper instead of
SMPSU circuitry. You might be able to adapt it, but don't forget to
include a surge limiting resistor - the current is very high around
the zero crossing portion of the AC waveform.

That's mad, the current will be very low around the zero crossing of
the AC waveform.

Three words - "rate of change".

It has nothing to do with rate of change, the voltage by definition
is close to zero, so the current is in fact very low. Ohms law.

Geez - and I thought I wasn't great at AC
theory..........................

A coupling capacitor (wattless dropper) blocks DC, the AC waveform is
almost that at the peaks. The capacitor only passes a rate of change -
that's at its greatest around the zero crossing points.

Maybe you should lay off the booze (or whatever)........

I have put such a circuit in a simulator, and except for the inrush
current I don't see anything like you said.
Try it yourself, like on: http://www.falstad.com/circuit/
Select 'File', 'import from text', and paste this text, a simple example:

$ 1 0.000005 3.452441195350251 45 5 43
s 688 96 752 96 0 0 false
v 752 368 752 96 0 1 50 330 0 0 0.5
d 480 352 480 240 1 0.805904783
d 576 112 576 208 1 0.805904783
w 688 96 576 96 0
w 576 96 576 112 0
w 480 96 576 96 0
w 480 352 480 368 0
d 416 144 416 96 1 0.805904783
d 416 272 416 352 1 0.805904783
w 480 96 416 96 0
w 416 352 416 368 0
w 432 368 480 368 0
370 688 368 752 368 1 0
162 480 224 480 160 1 2.1024259 1 0 0 0.01
162 512 224 512 160 1 2.1024259 1 0 0 0.01
162 544 224 544 160 1 2.1024259 1 0 0 0.01
w 480 144 480 160 0
w 480 160 512 160 0
w 512 160 544 160 0
w 544 224 512 224 0
w 512 224 480 224 0
w 432 144 416 144 0
c 560 368 624 368 0 5e-7 -9.1361757825205
w 688 368 624 368 0
w 560 368 480 368 0
w 416 144 416 160 0
w 416 160 416 272 0
w 432 368 416 368 0
w 432 144 480 144 0
w 480 240 480 224 0
r 560 320 624 320 0 220000
w 560 320 560 368 0
w 624 320 624 368 0
w 576 208 576 224 0
w 480 240 576 240 0
w 576 240 576 224 0
o 1 64 0 2083 640 0.1 0 -1 0
o 30 64 0 2083 640 0.1 1 -1 0

You have to reset the simulation and start again do get the current range
to normal after the inrush.
AFAIK The only important thing to remember is to use at least an X3 rated
capacitor and a discharge resistor across the cap, so yo don't get zapped
when touching the open pins.
Click to expand...

If you have to reset it after the inrush - that's probably why you're not
seeing the cycle by cycle current peaks around the point of maximum rate of
change.
 
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