DECT cordless phone base station

Cordless phones connect to the wired phone network through a "base station" - the part which is plugged into the phone jack.  The base station and cordless phone handset communicate by radio.  

The handset only transmits during a call.  The base station, however, sends out very brief transmissions periodically even when it is idle (ie when there is there is no call in progress), in order to maintain contact with the handsets that are connected to it.  The average power is very low.

The graph below shows measurements made at distances of 0.3, 0.5 and 1 metre from a Panasonic DECT cordless phone in idle.  Measurements were made at the front, left, right and rear of the phone, and the results are shown in the graph. The graph shows the exposure (averaged over half a second) as a percentage of the public limit in the New Zealand exposure Standard.

The measurements show that (for this model of phone) exposures were higher on the right (as you look at the phone) and the rear.  

30 centimetres from the phone, the highest exposure on any side was 0.016% of the limit (ie about 6,000 times below the limit).  One metre away the highest exposure was about ten times lower than this.  

The differences between the measurements at the front and right, and rear and left, are probably due to the position of the antenna inside the base station.  

When the base station was mounted onto a wall, the exposure on the other side of the wall about 30 cm from the rear of the base station was 0.0016% of the public limit.

Any questions about these measurements? Get in touch.

Last updated: 8 November 2013