NextStepBabyMonitors.com Knowledge Base
|
|
|
© n e x t s t e p b a b y m o n i t o r s . c o m
|
 Welcome!
Video baby monitors are a relatively new item on the market, utilizing some of the latest advances in technology. These exciting products are revolutionizing the way we monitor our loved ones and represent the next generation of baby monitoring.
By learning more about video baby monitors and how they work we hope to make you an informed consumer. Overall our goal is to help you decide which system is best for you and to ensure you get the best performance possible.
Frequency
We receive the most questions from customers asking which monitoring system is right for them. Different video baby monitors use different frequencies to send their signals. Video baby monitors use the same frequencies as many other common household electronics and as a result undesirable interference can occur.
By purchasing a monitoring system that is most compatible with the other wireless electronics (if any) in your household you can get the best performance from your monitor. At NextStepBabyMonitors.com each monitor is clearly labeled with the frequency it uses.
Below we outline the most common frequencies used by video baby monitors as well as other electronic devices that share those frequencies. If there are no other wireless devices on the same frequency in the vicinity of your video baby monitor you can expect optimum performance.
5.8 GHz Overview
The majority of new cordless phones now use 5.8 GHz. None of the video monitoring systems at NextStepBabyMonitors.com use this frequency. So environments with 5.8 GHz phones in use will not cause unwanted interference.
2.4 GHz Overview
2.4 GHz is one of the most common frequencies for video baby monitors today. In the past most cordless phones and other devices used the 900 MHz band. So when the 2.4 GHz band became available several years ago manufacturers flocked to 2.4 GHz. At the time 2.4 GHz was relatively unused so it could offer a high level of interference free operation.
Today the 2.4 GHz band is being used by an ever increasing number of devices. This is quickly causing the 2.4 GHz band to become over crowded and prone to interference issues since you may have several devices using this frequency in your home.
2.4 GHz Cordless Phones
2.4 GHz phones can interfere with a 2.4 GHz baby monitor. When the phone is ringing or in use a 2.4 GHz baby monitor can have added static.
Generally when a 2.4 GHz phone is not in use no interference is caused. However we came across a few customers with 2.4 GHz phones that even when not in use the phone was still transmitting data and causing harmful interference. The ways to eliminate the interference in this case was to un-plug the 2.4 GHz phone all together, get a different phone using another frequency (900 MHz or 5.8 GHz), or to get a video baby monitor on a different frequency (i.e. 900 MHz).
Overall, please check the frequencies of any cordless phones that will be in the area with the baby monitor to make sure they are not using the same frequency.
Also See: How Do I Know What Frequency Devices In My House Use?
Also See: Changing Channels
Wireless Computer Networks (Wi-Fi)
Network Types:
"B" 802.11b = 2.4 GHz
"G" 802.11g = 2.4 GHz
"N" 802.11n = 5.2 GHz
2.4 GHz Networks (802.11b "B" and 802.11g "G")
This is probably one of the biggest causes of interference problems with 2.4 GHz baby monitors. 802.11b (B) and 802.11g (G) wi-fi both use 2.4 GHz which is the same frequency as 2.4 GHz baby monitors. These wi-fi networks can cause severe interference and limit the usable range of your monitoring system.
When a computer is on and connected to a wireless network, data is constantly being transferred regardless if the computer is being used. When the computer and wireless network are off, no interference can occur.
The best advice is to use a 900 MHz baby monitor, or upgrade to the newest wi-fi standard 802.11n (see below) which uses 5.2 GHz instead.
As a result we recommend against purchasing any 2.4 GHz baby monitor system when you have a 2.4 GHz (802.11b or 802.11g) computer network in or around your house.
Neighbors
2.4 GHz wireless networks have become very wide spread recently. We are getting more and more reports of interference caused by a network in the same apartment building or from across the street, where the customer had no network of their own. In many cases the network is just in range enough to cause an annoying popping static on your monitor that repeats over and over.
Dense urban areas and high density housing (apartments & condos) have the most issues with interference from neighbors. If you plan to use your baby monitor in an environment like this we suggest going with a 900 MHz system. It is almost certain that someone nearby has a 2.4 GHz wi-fi network within range of your home if you live in high-density housing.
More Neighbor Interference Info - Also See: The Neighbors
Wireless "G" vs "B" vs "N"?
Wireless computer networks now come in a few different protocols. There is a new standard now available, 802.11n "N" which uses 5.2 GHz and will not interfere with 2.4 GHz devices when properly setup (see below).
The oldest networks are referred to as "B" (802.11b) and the slightly newer protocol is "G" (802.11g). Both "B" and "G" are 2.4 GHz. The difference is the protocol and compression rather than frequency, which is what matters when we're talking about interference with baby monitors.
So both "B" and "G" use 2.4 GHz and will cause continuous harmful interference to all 2.4 GHz devices including baby monitors and cordless phones. If there is a 2.4 GHz wireless computer network in your house go with a 900 MHz baby monitor or upgrade your network to the new 802.11n "N" which uses 5.2 GHz (see below).
5.2 GHz Wi-Fi "N" (802.11n)
The newest wi-fi standard uses 5.2 GHz and will not interfere if setup to only use 5.2 GHz. Often 802.11n routers by default broadcast on both 5.2 GHz and 2.4 GHz simultaneously to be backwards compatible with older hardware. By setting all devices on the network to only use 5.2 GHz you can eliminate interference with this 2.4 GHz baby monitor.
Network Channels
Almost all wi-fi networks have the ability to change channels, most have 10 channels to choose from. Channels are useful in separating your network from other networks in your area. Changing channels on your network can also improve your 2.4 GHz baby monitor reception but often does not solve the issue completely. Experiment to find the best results. Also moving the camera and monitor closer together will help strengthen the baby monitor's signal strength (also see Range).
The reason channel changing doesn't always solve interference issues is the frequency separation between channels is very small. With a 2.4 GHz network for example, all channels are still 2.4 GHz as only the second decimal place changes with each channel. For example the frequency of channel one is 2.41 GHz and channel two is 2.42 GHz. So you're still on 2.4 GHz no matter what the channel. But moving the network to a channel "further away" from your baby monitor's frequency can reduce static.
The same is true with the video baby monitors which commonly have several channels of their own. These channels are useful for allowing multiple cameras to work at the same time, but are often ineffective in fully preventing other 2.4 GHz devices from interfering. However the channel furthest away from the interfering device will produce better results.
Also it is a good idea if you have two cameras in your video baby monitor system to have one camera on channel 1 and the other on channel 3 (or the channel furthest away). By having the cameras on channels further away from each other instead of on channels 1 and 2, you increase separation which reduces channel "bleeding" and can improve overall performance.
Cellular Wireless Internet
The new cell provider based (Verizon & Sprint) wireless internet connections use their own frequencies. As a result, this type of wireless internet access will not interfere with your baby monitor.
Also See: How Do I Know What Frequency Devices In My House Use?
900 MHz
900 MHz is a frequency band that was popular for many wireless devices a few years back. Devices using this band that can cause interference with a 900 MHz baby monitor are cordless phones, wireless headphones and wireless speaker systems.
While there are now fewer cordless phones today that use 900 MHz, they are still out there. Additionally there are still new cordless phones and devices being sold today using 900 MHz. Overall, if you have a 900 MHz wireless device in use around your house do not purchase a 900 MHz baby monitor.
With the increased popularity of 2.4 GHz wi-fi networks and other devices, 900 MHz has become a safe haven of sorts for video baby monitors. While there are fewer monitors available on 900 MHz since it's an older frequency, these systems are able to operate interference free from 2.4 GHz devices and are currently in high demand. If you intend to use your baby monitor in an area which you are concerned about 2.4 GHz wi-fi and other devices, going with a 900 MHz monitor is your best bet.
Also See: How Do I Know What Frequency Devices In My House Use?
1.2 GHz
Wireless cameras that operate in the .96-1.215 GHz band do so on a restricted frequency band under FCC Rules that is allocated for aeronautical navigation use only. As a result NextStep does not sell any systems that use this frequency.
Microwaves
Microwave ovens when in use (cooking), can cause possible interference with baby monitors of all frequencies that are positioned very close by. Microwaves emit RF spanning a large range of upper frequencies when cooking food. This can happen anytime a monitor or camera is placed within close proximity of an in use microwave (approx 8 ft or less). No interference can occur when the microwave is not in use, or when the baby monitor is further away.
Cell Phones
With the concern about interference caused from common cordless phones, many people have now lumped cell phones into that category because they are also cordless.
Cell phones operate in a fully different frequency spectrum than baby monitors and will not cause interference due to frequency sharing.
However, cell phones do emit very strong RF so if a monitor or camera is placed within a few feet of an in-use cell phone you may encounter some audio interference.
The same is true with the new cell provider based (Verizon & Sprint) wireless internet connections. This data link is on its own frequency, and does not use 2.4 GHz like the wireless computer networks that are used in the home.
As a result, this type of wireless internet access will not interfere with your baby monitor.
How To Avoid Interference Overview: 
There are three main ways to insure the highest level of performance of your monitoring system and to minimize the effects of unwanted interference. We will outline them below:
Work Around
If you have some of the wireless devices mentioned above in your home, find out what frequency they use and simply purchase a monitoring system that uses a different frequency.
How Do I Know What Frequency Devices In My House Use? Usually this is very simple. Cordless phones often clearly label the unit itself with the frequency it uses. If not, try looking at the bottom of the base unit for the phone. It should say in smaller text on the label there.
The same is true with all other wireless devices. They will often display their frequency on the product itself in one form or another. If not check the user manual (if you still have it), the frequency used will always be provided there.
Another useful way is to Google the model number of your product. You can almost always bring up product info on-line and find out what frequency your wireless device uses. Once you know what frequency your cordless phones and other devices (if any) use, you can purchase a baby monitor which uses a different (and un-used) frequency so it can operate in an interference free environment.
Channels
The majority of video baby monitors have multiple channels. These extra channels are designed to be used for multiple cameras. They also allow you to select the channel with the best reception. If you are getting static interference from another device changing channels can improve your baby monitor's reception but often does not solve the issue completely. Experiment to find the best results.
The reason channel changing doesn't always solve interference issues is the frequency separation between channels is very small. In a 2.4 GHz system for example, all channels are still 2.4 GHz as only the second decimal place changes with each channel. For example the frequency of channel one is 2.41 GHz and channel two is 2.42 GHz. So you're still on 2.4 GHz no matter what the channel. But using a channel that is "furthest away" from the frequency of the interfering device can reduce static.
Also it is a good idea if you have two cameras in your video baby monitor system to have one camera on channel 1 and the other on channel 3 (or the channel furthest away). By having the cameras on channels further away from each other instead of on channels 1 and 2, you increase separation which reduces channel "bleeding" and can improve overall performance.
Other wireless devices such as cordless phones, and Wireless Computer Networks all have channel selectors. However, two devices on the same frequency band often will not be able to operate without interference regardless of the channel settings on either unit. But changing channels can often lessen static. Overall do not count on channels to fix an interference issue. By far the best solution is using devices that do not share the same frequency.
Also See: 2.4 GHz Wi-Fi Network Channels
Un-Plug
If you have devices which share the same frequency as your video baby monitor, unplugging or not using them while the baby monitor is in use will eliminate any interference issues. Or, if you just can't part with or turn off those devices, just be aware of the interference they can cause when the monitoring system is in use.
The Neighbors 
If you live close to your neighbors such as in an apartment or condo, keep in mind if they use some of the wireless devices mentioned here, they too can affect your monitoring just like devices in your own home. As you know, wireless computer signals and wireless audio/video signals are designed to penetrate walls and ceilings.
It can be a real pain dealing with wireless interference coming from one or more of your neighbors. It can also be hard to tell where exactly where the interfering device is located. As mentioned above the best answer is the "work around" and simply using a different frequency than the competing wireless device(s) next door.
Dense urban areas and high density housing (apartments & condos) have the most issues with interference from neighbors. If you plan to use your baby monitor in an environment like this we suggest going with a 900 MHz system. You can be almost certain that someone has a 2.4 GHz wi-fi network within range in these high-density areas.
As much as you might like to, going to your neighbor's home and smashing their offending wireless devices is not recommended. :)
Also See Privacy Overview
Range Overview
The reception range of your video baby monitor system depends on several factors. Besides harmful interference (covered above), the factors with the most impact on useable range are Transmission Strength, Geography and Power all of which are outlined below:
Transmission Strength
The amount of transmission power the wireless camera has is a major factor in how much range you can expect to get out of any system. At NextStepBabyMonitors we list the estimated range for each system as provided to us by the manufacturer.
This is a very rough way to gauge the expected amount of range since that depends on many different factors. This published distance should not be taken as any guarantee to the range you can expect. It is in the manufacturer's interest to publish a large range specification for their product, so be aware of this. If only one distance is provided it is always the "clear line of site" distance with no obstructions (see below).
We often get asked which system has the longest range? The reality is that all systems are regulated in transmission power by the FCC guidelines. Almost all but the very cheapest systems use the max amount of power allowed, which is about equal to your average cordless phone. Given that most systems have the same transmission strength, it depends more on the other factors listed below to determine the actual range you get.
The common misconception is often seen with the customer with a 6000 sq ft house who tries a system and does not have the range needed. They then proceed to return the system and try several others hoping one might have more power than the other. You can expect about the same amount of range from most systems with some slight differences between models. Battery power vs AC power does make a large difference however (see below).
Geography
You will see two different distances provided under the range specification on the video baby monitor pages. These are "clear line of sight" and "obstructed".
Clear Line Of Sight means the maximum distance the camera and receiver can be when used on a flat open area such as a football field, where there are also no obstructions. Obviously the usable distance will be much greater when the camera and receiver can visibly see each other and there are no obstructions.
In real world most people use video baby monitors in the home and the camera and receiver are rarely used in an environment such as a football field. Fortunately all the frequencies used by video baby monitors were specifically designed to penetrate walls, ceiling, floors and other common obstacles.
While these signals can pass through solid objects such as walls, it does come at the price of reduced range. The more barriers a signal must penetrate, and the denser those barriers are, the shorter the usable distance becomes between receiver and camera.
Obstructed is the distance provided in the specifications that is a rough estimate of the range you can expect when the system is being used with obstructions between camera and receiver. This range will obviously vary depending on the number and density of obstacles a signal must penetrate in the particular environment the system is used in.
Power
Lastly, a camera is unable to transmit at its maximum capacity on a dead or dying set of batteries. Always make sure the camera is plugged in, or using a good set of batteries to ensure you get the most reception range out of your system.
If you notice a gradual decrease in the reception range of your system and you are using batteries, there is a good chance the batteries need to be replaced. It is also just as important for the monitor/receiver to have a good set of batteries to ensure the best performance. Plugging the units into AC power is always best when the portability and convenience of battery power is not required.
Power Systems Overview
Some video baby monitoring systems allow both the camera and monitor to be powered by AC adapter or batteries.
Overall, the video screens on the monitors by far consume the most power. When running on battery power most monitors have an auto-off function that turns off the monitor after several minutes of inactivity. This serves to preserve the battery life. When plugged in the auto-off feature is usually disabled.
Cameras in general will use less power than a receiver with a built-in monitor. However, Night Vision capable cameras (those with IR illuminators) use much more power in night vision mode than they do in normal mode.
This is because in night vision mode the IR illuminators are turned on. These LED (light emitting diodes) lights work the same as mini-flashlights, except the light is invisible infrared light. These lights do consume a lot of power, and most night vision cameras have at least six or more IR LEDs which are illuminated in night vision mode.
Camera power is an important factor when using night vision mode to monitor a sleeping baby all night. Since the camera consumes much more power when in night vision mode, a set of batteries will typically be drained before morning. So it is best to be able to plug in a camera using the AC power if it is to be used for extended periods of time in night vision mode.
Rechargeable Batteries
There are a few models, like our Value System, that have a rechargeable battery for the monitor unit. This is the same style battery found in many cordless phones. The added benefit is mainly the cost savings of not having to continually purchase expensive alkaline batteries.
Night Vision
Night vision solves a very important issue with video baby monitors. As we all know, babies and the rest of us usually sleep with the lights off. And the main purpose of a baby monitor is to monitor your infant while they sleep. But cameras need light to be able to see.
The solution is infrared (IR) night vision. Our human eyes are able to see what is called the visible light spectrum. The wavelengths just below the visible light spectrum is infrared (IR).
Humans are unable to see infrared light, making it fully invisible. Cameras however, can be designed to see infrared light, which is the case of the monitoring systems we carry with the night vision feature.
In a fully dark room our eyes and standard cameras require a light source to be able to see. Infrared cameras are no different, they require an infrared light source to illuminate the area which you wish to monitor. Note that almost all night vision capable cameras are also able to operate in a normal mode with regular visible light and full color.
Night Vision On/Off: Night vision is either automatically or manually turned on and off depending on the system. Automatic systems use a light sensor just like those found in common night lights. This sensor automatically kicks in the night vision when light goes below a set level. On other systems there is a selector on the camera that switches the unit between normal and night vision modes. We've had customers report their night vision was "broken" when they simply failed to turn it on.
Night Vision Has No Color: We had a return where a lady thought her system was "cheaply made" because the night vision picture was a greenish tint. In low and no light situations there is no color to be viewed. Color is the first thing to go from our eye site as light dims to dark. All video baby monitors when in night vision mode either switch to black and white or green monochrome. This is mainly to increase contrast to make the low light images more visible, just like professional and military night vision systems.
In the pitch dark this is where IR illuminators come in. These are small yet powerful LED (light emitting diodes) lights that are built into cameras and shine IR light. Most cameras have several IR LEDs, numbering anywhere from 6 to 18. These IR LEDs work just like an invisible flash light providing the IR light the camera needs to be able to see in the dark room. The result is the dark room is now lit so the camera can see, but since the light is fully invisible it will not disturb your sleeping baby.
Night Vision Is Very Short Range: The average range these IR LEDs are able to illuminate is up to about 6-8 feet max. Look at the LEDs and you will see they are very small. So they will not illuminate the whole room, but will be able to provide enough IR light to the immediate area in front of the camera to allow for viewing. Again customers have reported their night vision was "not working" because they couldn't see their baby in the dark. In this situation the camera was placed across the room from the baby over 12 feet away and the small IR LEDs are unable to illuminate that far.
If we are unable to see IR light, then how do we get a viewable image on the receiver end? The answer is the camera system takes the IR image and converts it into the visible light image which we can then view.
Night Vision+ A Great Solution: A solution to the limited range of most system's night vision is our Night Vision+ IR Illuminator. This device is simply an IR flood light, packed full with 28 high-intensity IR illuminators. Able to shine invisible IR light up to 30 feet, this unit will increase the effective range of your system's night vision, allowing greater flexibility in camera placement.
Night vision brightness also greatly increases with use of the illuminator, providing increased clarity and contrast in night vision conditions. Since the illuminator is a stand alone product and not connected with your system, you can have as many illuminators as you want.
Privacy Overview
This is a very important topic and one of increasing importance as the number and availability of wireless devices continues to grow.
Just as with cordless phones that share the same frequencies, wireless video systems send their signals in an unencrypted format. Just as you have the ability to purchase another receiver unit to monitor your cameras, this also means anyone else with a compatible receiver within range can potentially pick up those audio and video signals as well.
The reason why so many wireless devices (phones, computer networks, wireless audio/video) operate so well for so many people in such close proximity is the FCC has limited the amount of power they use to transmit. This limits the reception range of these devices, allowing cordless phones in your home for example to not interfere with your neighbor's cordless phone across the street.
So while all these signals are unencrypted, the range is limited to the immediate area in and around your home. Wireless video systems are a great tool, but consumers should be knowledgeable about how they operate.
Web Monitoring
Here at NextStepBabyMonitors.com we have been working hard to bring monitoring systems to the next level for the average consumer. Basic video baby monitors allow a wireless camera to send audio and video back to a nearby receiver where it can be viewed.
But what if you could take that same camera and make its video available on-line? Parents could monitor their children, the nanny or even pets while at work or any location in the world with access to the Internet.
We now offer a next generation product, the GosCam Network IP Camera by 4ucam which provides easy installation. It's a wired system which we decided to go with after all the issues with wireless interference, so there is zero chance of interference happening with this system. Ethernet cables are available in extended lengths making placement easy.
The IP Cam is a fully self contained web server that once set up with a unique IP it's ready to go. Users will love the full pan-n-tilt ability as well as zoom and record functions. View the camera from any computer on-line, just login using your password. No software is required for the computer viewing the camera, just type in the IP address into a browser.
This is truly a unique cutting edge product which revolutionizes the way you can monitor your children, loved ones, and home. Be sure to read more about the Network IP Camera here.
|
...
