Thursday, December 13, 2012

nightly interference on the baby monitor?

Q. Every night at the same time there is loud interference on our analog baby monitor. Other than this we have no problems with it picking up neighbors etc. Even if we turn the volume all the way down, we can still hear peoples garbled talking as if it were turned all the way up. There are pauses, like it is an actual conversation, but we cannot make out anything specific. It happens on both channels. We tried digital monitors but it was constantly losing signal with its base, causing the alarm to go off, no matter what we did. And that was the expensive one. (We tried two different ones)

Any ideas, suggestions?

A. ...ever seen the movie Paranormal Activity?.... that's probably what's happening if its in the middle of the night. You need to get someone to come to your house who has experience with spirits. I'm serious, I know someone who did it too not like the movie.. but they had someone come to the house.


How do you stop a baby monitor from making a buzzing sound?
Q. I have an 'Angel Care' monitor and often it seems to buzz loudly when I have electrical appliances plugged in or lights on - it seems to be effected by the electrical current of my house.
I turn all the lights off at night and leave nothing plugged in, but sometimes it still buzzes and is very annoying when I am trying to get to sleep.

A. Try moving it to a different location in your room, sometimes moving it a few inches one way or the other helps too.

Or you can return it and get a different one. It's electrical interference for sure.


Why is my 49MHz wireless helicopter operating erratically?
Q. Works in the store at the mall with all the nearby stores, but not anywhere near my house or my neighborhood. I turned off the baby monitor, but not sure what else could be interfering.

A. Dear sir you have an interference problem! you need to find the way to change the channel! or change the entire radio in that way you don't have to worry about other people using the same channel that you are working on! I advice that you go to your nearest hobby shop and talk to them about it!
God bless and good luck.


Why would a non-wireless router emit so much radiation?
Q. I have a TP-Link router and it's not a wireless one, yet it seems to emit quite a strong magnetic field of almost two metres, as it causes interference with my baby monitor. Should I be concerned about this? Or is it normal for a router to emit so much radiation? The thing is that the router is under my desk right where I sit to work!

A. Any piece of modern digital electronics emits electro-magnetic interference. The very high speed circuits invoved (several MHz clock frequency) conduct through copper traces on the circuit board in the thing. The copper traces act like antenna and thus emit the "noise" you hear on your baby monitor.

Even the power supply for your router could be the culprit. To achieve small size and high efficiency, the power supply "brick" will often contain high speed electronics which could also be the source of the emission.

Finally, the typical baby monitor is a pretty low quality electronic device. It lacks selectivity and is likely picking up noise from frequencies that are not important to it. A different brand monitor might not suffer this problem.

Also, better quality routers would enclose their circuit boards in a metal housing. Such enclosure would contain the EMI in a so called Faraday cage. I suppose you could put your router in a metal box and accomplish the same thing now.

Astrobuf





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