Dog Emitting RF?

James Morrison · Jul 19, 2005

Hello everyone,

This is an interesting puzzle that I can't explain so hopefully the
bright people of s.e.d can help illuminate the situation.

Last night, as I'm laying in my bed and reading Rich Lyons DSP book to
refresh my mind on some fundamental DSP issues my Labrador Retriever dog
comes up beside the bed and is looking for his nightly "Good Night".
This is all usual and predictable. At the same time we have a baby
monitor running so that we can hear our 4 month old in another room.

So here's the wierd part: As I'm laying on my bed any time I touched
the dog sitting on the floor to pet him there was static in the baby
monitor. I experimented for a long time to see if I could get any more
information: Every time my hand came in contact with his fur there was
static in the baby monitor.

I couldn't really come up with any explanation outside of my dog somehow
being an RF transmitter and me acting as an antenna. As much as that
may explain it I don't think that is what is happening.

Here are a few physical details about the setup: The baby monitor
transmitter is south of me by about 10' through a wood studded wall with
drywall on both side. About 10' to the north of me is the receiver.
Both the transmitter and receiver are powered from the same 110VAC
circuit and have thus have the same ground. The only other metal I can
think of in the equation is the springs in the bed I was laying on. The
baby monitor also has a pad that detects movement and breathing and sets
an alarm when these stop. I'm not sure what technology that is using.

So does anyone have any thoughts as to what was happening?

Cheers,

James.

Dan Hollands · Jul 19, 2005

Sounds like static electricity causing effects similar to lightning noise in
an AM radio

--

Dan Hollands
1120 S Creek Dr
Webster NY 14580
585-872-2606
QuickScore@USSailing.net
www.QuickScoreRace.com

"James Morrison" <spam1@stratforddigital.ca> wrote in message
news:1121778404.5020.69.camel@oxygen.emorrison.ca...

Hello everyone,

This is an interesting puzzle that I can't explain so hopefully the
bright people of s.e.d can help illuminate the situation.

Last night, as I'm laying in my bed and reading Rich Lyons DSP book to
refresh my mind on some fundamental DSP issues my Labrador Retriever dog
comes up beside the bed and is looking for his nightly "Good Night".
This is all usual and predictable. At the same time we have a baby
monitor running so that we can hear our 4 month old in another room.

So here's the wierd part: As I'm laying on my bed any time I touched
the dog sitting on the floor to pet him there was static in the baby
monitor. I experimented for a long time to see if I could get any more
information: Every time my hand came in contact with his fur there was
static in the baby monitor.

I couldn't really come up with any explanation outside of my dog somehow
being an RF transmitter and me acting as an antenna. As much as that
may explain it I don't think that is what is happening.

Here are a few physical details about the setup: The baby monitor
transmitter is south of me by about 10' through a wood studded wall with
drywall on both side. About 10' to the north of me is the receiver.
Both the transmitter and receiver are powered from the same 110VAC
circuit and have thus have the same ground. The only other metal I can
think of in the equation is the springs in the bed I was laying on. The
baby monitor also has a pad that detects movement and breathing and sets
an alarm when these stop. I'm not sure what technology that is using.

So does anyone have any thoughts as to what was happening?

Cheers,

James.

James Morrison · Jul 19, 2005

On Tue, 2005-07-19 at 13:20 +0000, Dan Hollands wrote:

Sounds like static electricity causing effects similar to lightning noise in
an AM radio

One thing I failed to mention is that I just had to touch the dog, there
didn't have to be motion. I can see if I'm rubbing the fur that a
static charge would be built up but if my hand is stationary wrt to the
dog then how does that create a static charge?

Tim Shoppa · Jul 19, 2005

Dog Emitting RF?

You should send a notice to the dog's manufacturer saying that he is in
violation of FCC Part 15.

There may be an exception of the dog was sold only for use in
commercial and/or industrial situations.

Tim.

Mark · Jul 19, 2005

there was a signal null like when you stop in a null and get noise on
your FM radio in the car, you pull up 1 foot and you are out of the
null. If you move the baby monitor transmitter or receiver one foot
the noise will also probably stop. By chance, your position and the
dog created a signal null.

Mark

Richard Henry · Jul 19, 2005

"James Morrison" <spam1@stratforddigital.ca> wrote in message
news:1121779635.5020.72.camel@oxygen.emorrison.ca...

On Tue, 2005-07-19 at 13:20 +0000, Dan Hollands wrote:
Sounds like static electricity causing effects similar to lightning
noise in
an AM radio

One thing I failed to mention is that I just had to touch the dog, there
didn't have to be motion. I can see if I'm rubbing the fur that a
static charge would be built up but if my hand is stationary wrt to the
dog then how does that create a static charge?

Does your bed have metal box springs, that might be acting as an antenna to
the microwaves being emitted from the stealth black helicopter hovering over
your neighborhood, charging up your body capacitance, which then gets
discharged through the dog?

James Morrison · Jul 19, 2005

On Tue, 2005-07-19 at 07:46 -0700, Richard Henry wrote:

"James Morrison" <spam1@stratforddigital.ca> wrote in message
news:1121779635.5020.72.camel@oxygen.emorrison.ca...
On Tue, 2005-07-19 at 13:20 +0000, Dan Hollands wrote:
Sounds like static electricity causing effects similar to lightning
noise in
an AM radio

One thing I failed to mention is that I just had to touch the dog, there
didn't have to be motion. I can see if I'm rubbing the fur that a
static charge would be built up but if my hand is stationary wrt to the
dog then how does that create a static charge?

Does your bed have metal box springs, that might be acting as an antenna to
the microwaves being emitted from the stealth black helicopter hovering over
your neighborhood, charging up your body capacitance, which then gets
discharged through the dog?

Great, now both I and my dog have to sleep with our tin foil hats on!

martin griffith · Jul 19, 2005

On Tue, 19 Jul 2005 10:48:39 -0400, in sci.electronics.design James
Morrison <spam1@stratforddigital.ca> wrote:

On Tue, 2005-07-19 at 07:46 -0700, Richard Henry wrote:
"James Morrison" <spam1@stratforddigital.ca> wrote in message
news:1121779635.5020.72.camel@oxygen.emorrison.ca...
On Tue, 2005-07-19 at 13:20 +0000, Dan Hollands wrote:
Sounds like static electricity causing effects similar to lightning
noise in
an AM radio

One thing I failed to mention is that I just had to touch the dog, there
didn't have to be motion. I can see if I'm rubbing the fur that a
static charge would be built up but if my hand is stationary wrt to the
dog then how does that create a static charge?

Does your bed have metal box springs, that might be acting as an antenna to
the microwaves being emitted from the stealth black helicopter hovering over
your neighborhood, charging up your body capacitance, which then gets
discharged through the dog?

Great, now both I and my dog have to sleep with our tin foil hats on!

SHINY SIDE OUT.........

martin

Joerg · Jul 19, 2005

Hello Mark,

there was a signal null like when you stop in a null and get noise on
your FM radio in the car, you pull up 1 foot and you are out of the
null. If you move the baby monitor transmitter or receiver one foot
the noise will also probably stop. By chance, your position and the
dog created a signal null.

That's most likely. To test it James could place a large metal pail
where his lab usually sits and then "pet" the pail. Should cause a
similar effect. Of course, his dog will be very puzzled about petting a
pail. If I was that lab I'd bark at it ;-)

Regards, Joerg

http://www.analogconsultants.com

Jim Thompson · Jul 19, 2005

On Tue, 19 Jul 2005 17:19:08 GMT, Joerg
<notthisjoergsch@removethispacbell.net> wrote:

Hello Mark,

there was a signal null like when you stop in a null and get noise on
your FM radio in the car, you pull up 1 foot and you are out of the
null. If you move the baby monitor transmitter or receiver one foot
the noise will also probably stop. By chance, your position and the
dog created a signal null.

That's most likely. To test it James could place a large metal pail
where his lab usually sits and then "pet" the pail. Should cause a
similar effect. Of course, his dog will be very puzzled about petting a
pail. If I was that lab I'd bark at it ;-)

Regards, Joerg

http://www.analogconsultants.com

480)460-2350 | |
| E-mail Address at Website Fax

Adrian Tuddenham · Jul 19, 2005

James Morrison <spam1@stratforddigital.ca> wrote:

Hello everyone,

This is an interesting puzzle...

What a pity you didn't include a hyphen in the title.

Dog-emitting RF would have been even more fun to explain.
[Thinks: Radio 3 broadcasting a Bark recital?]

--
~ Adrian Tuddenham ~
(Remove the ".invalid"s and add ".co.uk" to reply)
www.poppyrecords.co.uk

Rob · Jul 20, 2005

"James Morrison" <spam1@stratforddigital.ca> wrote in message
news:1121778404.5020.69.camel@oxygen.emorrison.ca...

Hello everyone,

This is an interesting puzzle that I can't explain so hopefully the
bright people of s.e.d can help illuminate the situation.

Last night, as I'm laying in my bed and reading Rich Lyons DSP book to
refresh my mind on some fundamental DSP issues my Labrador Retriever dog
comes up beside the bed and is looking for his nightly "Good Night".
This is all usual and predictable. At the same time we have a baby
monitor running so that we can hear our 4 month old in another room.

So here's the wierd part: As I'm laying on my bed any time I touched
the dog sitting on the floor to pet him there was static in the baby
monitor. I experimented for a long time to see if I could get any more
information: Every time my hand came in contact with his fur there was
static in the baby monitor.

I couldn't really come up with any explanation outside of my dog somehow
being an RF transmitter and me acting as an antenna. As much as that
may explain it I don't think that is what is happening.

Here are a few physical details about the setup: The baby monitor
transmitter is south of me by about 10' through a wood studded wall with
drywall on both side. About 10' to the north of me is the receiver.
Both the transmitter and receiver are powered from the same 110VAC
circuit and have thus have the same ground. The only other metal I can
think of in the equation is the springs in the bed I was laying on. The
baby monitor also has a pad that detects movement and breathing and sets
an alarm when these stop. I'm not sure what technology that is using.

So does anyone have any thoughts as to what was happening?

Cheers,

James.

I think the folllowing ruff explanation may help you collar the problem :

"The Barkhausen criteria states that for a positive feedback system,
oscillation will occur when the loop gain (product of forward gain and
feedback gain) has a phase shift of zero (180 degrees for negative feedback
systems) and a magnitude of unity. Genital licking should not be consdered
as feedback, but rather as a loopback activity. "

Rob

Robert Baer · Jul 20, 2005

James Morrison wrote:

Hello everyone,

This is an interesting puzzle that I can't explain so hopefully the
bright people of s.e.d can help illuminate the situation.

Last night, as I'm laying in my bed and reading Rich Lyons DSP book to
refresh my mind on some fundamental DSP issues my Labrador Retriever dog
comes up beside the bed and is looking for his nightly "Good Night".
This is all usual and predictable. At the same time we have a baby
monitor running so that we can hear our 4 month old in another room.

So here's the wierd part: As I'm laying on my bed any time I touched
the dog sitting on the floor to pet him there was static in the baby
monitor. I experimented for a long time to see if I could get any more
information: Every time my hand came in contact with his fur there was
static in the baby monitor.

I couldn't really come up with any explanation outside of my dog somehow
being an RF transmitter and me acting as an antenna. As much as that
may explain it I don't think that is what is happening.

Here are a few physical details about the setup: The baby monitor
transmitter is south of me by about 10' through a wood studded wall with
drywall on both side. About 10' to the north of me is the receiver.
Both the transmitter and receiver are powered from the same 110VAC
circuit and have thus have the same ground. The only other metal I can
think of in the equation is the springs in the bed I was laying on. The
baby monitor also has a pad that detects movement and breathing and sets
an alarm when these stop. I'm not sure what technology that is using.

So does anyone have any thoughts as to what was happening?

Cheers,

James.

Everybody knows that a dog emits an Asynchronous Redundant Fractal

Format Signal (ARFFS).

(best i could do this time of day)

Barry Lennox · Jul 20, 2005

On Tue, 19 Jul 2005 09:06:44 -0400, James Morrison
<spam1@stratforddigital.ca> wrote:

Hello everyone,

This is an interesting puzzle that I can't explain so hopefully the

Probably simple, it's a static "brush" discharge,

We acquired two cats (sisters) a while back,"Buffy" and "Sparky" My
wife declared that "Sparky" was a daft name for a cat, so she became
"Missy" But as soon as the dry weather set in, we discovered why she
was called "Sparky" She is a menace to go near! and I have heard
crackling on the radio when brushing her. Funnily enough "Buffy" does
not display the problem.

Barry Lennox

E. Kappos · Jul 21, 2005

This is rather going to add to your puzzle rather than solve it.

I grew up in the a mountainous countryside in central Greece
where thunderstorms and lightning is relatively common.
Two of the rules for protection in case of thunderstorms were
1. Do not seek shelter under a tree.
2. Keep your dog away.

I've always thought of (2) as a local superstition.
Your experience makes it rather more puzzling.

All I can suggest is that you tentatively replace your dog with a cat and
see what happens -

If your "experimental setup" is suitable for a reproducible experiment, you
may
finally resolve this superstition.

cheers,

Euthymios Kappos

"James Morrison" <spam1@stratforddigital.ca> wrote in message
news:1121778404.5020.69.camel@oxygen.emorrison.ca...

Hello everyone,

This is an interesting puzzle that I can't explain so hopefully the
bright people of s.e.d can help illuminate the situation.

Last night, as I'm laying in my bed and reading Rich Lyons DSP book to
refresh my mind on some fundamental DSP issues my Labrador Retriever dog
comes up beside the bed and is looking for his nightly "Good Night".
This is all usual and predictable. At the same time we have a baby
monitor running so that we can hear our 4 month old in another room.

So here's the wierd part: As I'm laying on my bed any time I touched
the dog sitting on the floor to pet him there was static in the baby
monitor. I experimented for a long time to see if I could get any more
information: Every time my hand came in contact with his fur there was
static in the baby monitor.

I couldn't really come up with any explanation outside of my dog somehow
being an RF transmitter and me acting as an antenna. As much as that
may explain it I don't think that is what is happening.

Here are a few physical details about the setup: The baby monitor
transmitter is south of me by about 10' through a wood studded wall with
drywall on both side. About 10' to the north of me is the receiver.
Both the transmitter and receiver are powered from the same 110VAC
circuit and have thus have the same ground. The only other metal I can
think of in the equation is the springs in the bed I was laying on. The
baby monitor also has a pad that detects movement and breathing and sets
an alarm when these stop. I'm not sure what technology that is using.

So does anyone have any thoughts as to what was happening?

Cheers,

James.

Thiemo Nordenholz · Jul 21, 2005

Hi there,

So here's the wierd part: As I'm laying on my bed any time I touched
the dog sitting on the floor to pet him there was static in the baby
monitor. I experimented for a long time to see if I could get any more
information: Every time my hand came in contact with his fur there was
static in the baby monitor.

Static, dog, fur, cat in the follow-up -- Makes me think about static
electricity... How about air humidity at that time, is it summer "over
there", with dry air, and your dog's fur charging up as he moves?
Just a thought...

Cheers,
Thiemo
--
Query a PGP key server (e.g. http://www.pgp.net/) for my public key 41068629.
Strange sender address? Please see http://www.thiemo.net/misc/list-mail.shtml

Rich Grise · Jul 21, 2005

On Thu, 21 Jul 2005 12:00:58 +0300, E. Kappos wrote:

This is rather going to add to your puzzle rather than solve it.

I grew up in the a mountainous countryside in central Greece
where thunderstorms and lightning is relatively common.
Two of the rules for protection in case of thunderstorms were
1. Do not seek shelter under a tree.
2. Keep your dog away.

I've always thought of (2) as a local superstition.
Your experience makes it rather more puzzling.

No, it's because the lightning and thunder will scare them,
and they could panic and run away.

Cheers!
Rich

Dog Emitting RF?

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