Cordless phones with answering machine review 2009

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05.Choosing a band

Many homes have a variety of devices that can crowd the airwaves with electronic interference. Aside from appliances such as microwave ovens and vacuum cleaners interfering with the performance of your cordless phone, the introduction of wireless networking within the home has introduced another potential source of interference, particularly with models operating on the same 2.4GHz band as most wireless networking devices.

This increasingly-common problem led to the introduction of cordless phones using the less congested 1.8GHz band. Other strategies introduced to deal with the increasingly crowded airwaves include Frequency-Hopping Spread Spectrum (FHSS) where the phone constantly flicks between different frequencies to find the clearest channel within which to operate.

Gaussian Frequency-Shift Keying (GFSK) is another technique that uses a Gaussian filter to smooth frequency deviations to make the voice appear as clear as possible.


Got a lot of wireless products at home, such as a baby monitor, home security monitor, wireless laptop computer or even a microwave? You may find that you get some interference between them and certain cordless phones.

  • Phones that marked as DECT run on a 1.8-1.9 GHz frequency which no other appliances use – so this might be the one to look out for if your house is full of wireless gadgets.
  • Other formats such as WDECT and DSS use what’s called ISM bands at either 5.8 GHz or 2.4 GHz which might cause some problems, for example with microwaves which emit a 2.4 GHz frequency when they are in action.

Cordless phones: a health risk?

Concern about the safety of mobile phones has lead to questions about the safety of cordless phones.

According to the Australian Government Australian Radiation Protection and Nuclear Safety Agency there is no substantiated evidence that even using a mobile phone causes any harmful effects.

Cordless phones, which are much lower powered devices only need to transmit signals over a relatively short distance to the receiver in your house or office. Currently there is no evidence to suggest that using a cordless phone can be a health hazard.


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