baby monitor whine

[Andy Fish]

Hi,

Sorry if this is an inappropriate group, but please let me know if
there is a better one for my question.

Sometimes my baby monitor receiver emits a whining noise which I have
sampled and found to be very sharply peaked somewhere between 4450 and
4500 hz. It usually starts in the afternoon (often but not always
around 4pm) and goes on for hours. It doesn't happen everyday (maybe 1
day in 10)

I have tried switching off just about everything in the house and
cannot find the cause - it's definitely not the central heating or
fishtank lights, which are the only things I have on a timer. It
almost never happens in the morning so I can't believe it's the
refrigerator or anything that switches on and off during the day.

Moving the monitor and/or receiver around the house seems to affect
the loudness of the whine. if they are very close to each other the
whine is much queter. I guess this is to be expected whatever the
cause.

anyone have any ideas what could be causing this?

Many thanks

Andy

 

[Jim Thompson]

On 7 Apr 2004 06:04:25 -0700, ajfish@blueyonder.co.uk (Andy Fish)
wrote:

Hi,

Sorry if this is an inappropriate group, but please let me know if
there is a better one for my question.

Sometimes my baby monitor receiver emits a whining noise which I have
sampled and found to be very sharply peaked somewhere between 4450 and
4500 hz. It usually starts in the afternoon (often but not always
around 4pm) and goes on for hours. It doesn't happen everyday (maybe 1
day in 10)

I have tried switching off just about everything in the house and
cannot find the cause - it's definitely not the central heating or
fishtank lights, which are the only things I have on a timer. It
almost never happens in the morning so I can't believe it's the
refrigerator or anything that switches on and off during the day.

Moving the monitor and/or receiver around the house seems to affect
the loudness of the whine. if they are very close to each other the
whine is much queter. I guess this is to be expected whatever the
cause.

anyone have any ideas what could be causing this?

Many thanks

Andy

Maybe another monitor in the neighborhood? I use one when my youngest
granddaughter visits. You can select one of two channels. Have you
tried switching channels?

...Jim Thompson
--
| James E.Thompson, P.E. | mens |
| Analog Innovations, Inc. | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| Phoenix, Arizona Voice480)460-2350 | |
| E-mail Address at Website Fax480)460-2142 | Brass Rat |
| http://www.analog-innovations.com | 1962 |

I love to cook with wine. Sometimes I even put it in the food.

 

[JeffM]

Sorry if this is an inappropriate group
Andy Fish

No prob. Deez eez da playz.

It usually starts in the afternoon (often...around 4pm)

Sounds like someone getting home from work/school...

It doesn't happen every day (maybe 1 day in 10)

....and beginning hobby activities.

Are you keeping a log of when it happens? That may help.
Find a nosy neighbor who knows everybody's schedule and you might nail it.

Jim's notion of another transmitter in the neighborhood sounds right.

 

[Jim Thompson]

On 7 Apr 2004 12:58:03 -0700, jeffm_@email.com (JeffM) wrote:

Sorry if this is an inappropriate group
Andy Fish

No prob. Deez eez da playz.

It usually starts in the afternoon (often...around 4pm)

Sounds like someone getting home from work/school...

It doesn't happen every day (maybe 1 day in 10)

...and beginning hobby activities.
Are you keeping a log of when it happens? That may help.
Find a nosy neighbor who knows everybody's schedule and you might nail it.

Jim's notion of another transmitter in the neighborhood sounds right.

Yep, listen in, never know what you might hear ;-)

...Jim Thompson
--
| James E.Thompson, P.E. | mens |
| Analog Innovations, Inc. | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| Phoenix, Arizona Voice480)460-2350 | |
| E-mail Address at Website Fax480)460-2142 | Brass Rat |
| http://www.analog-innovations.com | 1962 |

I love to cook with wine. Sometimes I even put it in the food.

 

[Andy Fish]

Jim Thompson <thegreatone@example.com> wrote in message news:<kg2870te82sov7i73v55p50m3go8fdl053@4ax.com>...

Maybe another monitor in the neighborhood? I use one when my youngest
granddaughter visits. You can select one of two channels. Have you
tried switching channels?

Thanks Jim, I don't know why I didn't think of this.

Unfortunately I don't have a channel switch but I do have a neighbour
with a baby - next time the noise starts I'll dash round there.

Andy