Wireless Intercom System- Considerations

Wireless Intercom System- Considerations

There are two main advantages of a wireless intercom system. First is that there are no wires to deal with between units which makes it very easy to do and secondly that you can reposition the units at your convenience.

Wireless intercom systems installs in minutes and can be working as soon as you provide it with sufficient power, may it be batteries or DC power. However, along the convenience the risk of interference is also present. It is possible that other wireless devices close to the intercom can cause interferences such as a wireless data network, a cordless phone, or electrical motors can cause disturbances.

An alternative risk is that other persons can pick up your conversations via a baby monitor, a scanner, cordless phone or any other comparable equipment that operates on the same frequency. Fortunately, there are wireless intercom systems that can reduce or completely eliminate these problems.

In the US there are a number of frequencies especially for the use of wireless products and systems. The most common frequencies are 49MHz, MURS 150 MHz, and FM between 200KHz up to 270KHz, 2,4Ghz, 5,8GHz, and 900MHz. Alternatively you can make use of Power Line Carrier units that make use of the current electrical house wiring to transfer signals to and from wireless appliances.

Normally low end wireless products such as baby monitors, and conventional cordless phones still use the 49MHz frequency. It is a short range and communication is not secure. This is also the most likely frequency that will pick up disturbances from other devices. No wireless intercom systems make use of this band.

It is possible to find a wireless intercom that makes use of the FM band. However, this is not a popular choice amongst consumers because optimum functionality depends on the number of other electrical appliances is used close to the system and it is highly likely that you will experience interferences. Conversations are also not secure.

North America, Israel, and Australia are the only countries using the 900MHz frequency. Previously wireless intercom systems making use of the 900MHz band applied analog technology. This was very risky because anyone that carried an appliance with the same band could listen to your communication. Fortunately today a number of 900MHz wireless products make use of digital spread spectrum transmission that transmit the signal over a different number of frequencies to ensure privacy.

Although there are not many wireless intercom systems using the 2,4MHz band, it is available all over the world. It is mostly used by wireless video intercom systems. The hindrance about the 2,4MHz systems is that this frequency is also used by wireless data networks which ultimately mean that you are likely to experience interference from there. One way to try to solve this problem is to change the channels of the wireless data router, which likely will solve the problem.

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