Monday, December 24, 2012

How far can a 900 MHz monitor get?

Q. I'm talking about baby monitor. Is it the same as a cordless phone range? Is it better than 49 MHz (as it's much higher frequency)?
Thanks for the answers. So you both says it doesn't matter on the difference as long as it's used in a house.

I was confused as some retailer shows the frequency but not the distance. While another shows the distance but no frequency (e.g. 49 MHz or 900 MHz. And another shows 120 m or 400')

Could anybody suggest which one is better to choose from? (based on the frequency or the distance)

A. Higher frequencies are more easily blocked, so lower frequency ones will probably have a better range. Both should work inside your house.
It depends more on the power output than on the frequency.

There may be less interference and noise with the 900Mhz one


Where can I find a baby monitor that won't interfere with wireless routers?
Q. My boyfriend's appartment building if full of wireless routers, and thats where we plan to raise our baby for a while. But we need a baby monitor that won't be affected by all the wireless routers. But everywhere I look it seems that every baby monitor that I seem interested in will be affected by a wireless router. I've already looked at Wal-Mart, Babies R' 'Us, Ebay, and Best Buy seems to not even carry baby monitors. Where Can I find a baby monitor that won't be affected by wireless routers?

A. Look for one that operates in the 900 Mhz or the 5.4 GHz frequency range.

Anything that is not 2.4 GHz should work.


2.4 GHZ / 5.8 - digital, 900 MHZ or wire phone ?
Q. I am a bit worried about the various signals around our houses these days. Cell phone, microwave, TV, wireless router, cordless phones etc..

How to keep this miinimum? What type of cordless is better in this regard?

A. I believe you are referring to the fact that we all have lots of waves radiating into our environment. Don't worry about the frequency ie 2.4, 5.9 900 so much as the dBI gain on the attenna of the transmitting device. While you probably don't want to sit in front of a large satellite dish or microwave transmitter for hours on end, being exposed to the relatively low power transmitters that exist in cordless phones, wireless LAN, etc is not unsafe. Keep in mind that radiation decreases the farther you move away from a transmitting object so again the low power transmitters you are talking about are safe from any distance but even a high powered one is safe just a matter of feet away.

For choosing a phone I would go with 5.8 GHZ as they typically have the best range and the majority of your wireless products probably use the 900 MHZ (old cordless phone, wireless baby monitor etc) or 2.4 GHZ (your wireless internet router, new cordless phone). In other words 5.8 GHZ would probably provide you the least chance of interference with any other products you own.

Hope this helps.


If you need 2 baby monitors, do they need to be the same brand?
Q. I have a son who will be 2 yrs 9 mos when my second is born in October. We generally stay pretty close to his room but he is on the second floor and we have a finished basement with a tv, so I feel like we still need a monitor for his room when we are on other floors. We have a fisher price sound and light monitor we got handed down from my brother in law which besides ocassional static works really well. of course its got to be almost 7 years old and I can't get one like it. I saw a good deal on a basic graco one that was highly rated. Would the 2 interfere or do you have to use the same brand?
On a related note, when did you stop using a monitor for older kids? My husband suggested we wouldn't need one but my son cannot open the bedroom door, we shut it at night because we don't want our cats in there, plus we have a lot of steps in our house, so i'd rather be able to hear him because its harder for him to come to us. I know people with school aged kids who still use one.
OK, since the first answerer clearly didn't read this-my son is 2 years 3 months so he doens't use the toilet, if he did he could call us and we'd come get him-thats why we have a monitor! we shut the door because we have cats and they would come in his room and wake him at night if we didn't-also our house is not so small we can hear him everywhere and he is still learning to navigate steps. Sheesh.

A. No they don't ... however, if they are both analog you they may encounter interference from each other.


1. Use one analog and one digital

2. Use an analog one of a different frequency --- ie: if you have a 900 MHz monitor, buy a 49 MHz one and vice versa.

3. You can also purchase one of the same frequency (esp 900 MHz because these have MANY channels) and see if you encounter interference --- most likely you will not. But it is possible.


I'm not sure what the two monitor's frequencies are --- so you will have to investigate. My suggestion is to buy a digital one as your second one. I have this digital one (reasonable price) and have always been happy with it.

http://www.diapers.com/Product/ProductDetail.aspx?productId=6619





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