900 MHz Phones
900 MHz Phones Overview
The 900 MHz cordless phones are second generation phones have been allocated the frequencies between 902-928MHz, with channel spacing between 30-100KHz.
The analog 900 MHZ phone have operating range from 75 to 400 feet. These phones with analog system were prone to interference & eavesdropping. The commercial wireless scanners were able to eavesdrop into the conversation easily making these phones insecure. With introduction of digital technology the problem of eavesdropping is no longer there.
The digital cordless phones in 900 MHz bands using digital spread spectrum (DSS) techniques provide larger range over analog phones. This is because the FCC allows DSS phones to transmit up to one watt of power while analog phones are limited to one milliwatt (0.001 watt). Thus DSS phone can transmit power one thousand times more than incase of analog phones using the same frequency. The DSS based phones claim to have range as from 200ft to 1500ft depending on the operating conditions.
900 MHz Phones Features
Following are some of the advance features available on 900 MHz cordless phones based on digital technology.
- Digital answering machine with around 15 min of recording time.
- Speakerphone is in the base as well as on handset
- Caller ID with around 50 numbers storage
- Phone book with capacity of more than 50 entries.
- Two line phones with conferencing facility.
- Speed dial
- Ringer volume control
- LCD display with backlit.
- Lighted keypads.
- Intercom; Voice communication between the handset and base of cordless phone.
- Multi channel auto scan.: Using this feature the cordless telephone can select the channel with least noise.
Main manufacturers of 5.8 GHz cordless phones are AT&T, Uniden, Panasonic, GE, VTech, Motorola, Sony and number of manufactures for China.
