Datasheet

8/27/2013
7
Cell Phone Signal
• Cellular signal strength is measured in decibels (dB), and will typically range
from -50dBm to -110dBm.
• The dB scale is logarithmic, every 3dB increase doubles the power, -67dB is
twice the power of -70dB.
• Every 6dB will approximately double the coverage distance from the inside
antenna.
0dB
Dropped calls
Gain and Loss
Gain – Gain is the ability of a device to increase the power of a signal. Gain is
measured in dB (Decibels). It is the power added to the signal by the amplifier or
antenna.
Loss - Loss, also called attenuation, is any reduction of signal strength. Loss occurs in
cables, splitters and connectors. It also occurs when the signal is transmitted through
the air. Loss is cumulative, and is subtracted from the signal.
Signal in: -100dBm
Signal out: -25dBm
Gain
Signal in: -100dBm
Loss
+ 75dB
Signal out: -105dBm
- 5dB
100’
LMR400