EMFields AM-11, User Manual

Page: 23 / 28

23
External Readings
Outdoors, readings vary a great deal. The most
prevalent outdoor source of RF EMFs are mobile
phone masts (base stations). Other external sources
can include radar (occasional high blips of up to 6
V/m), Radio/TV transmitters (which may show high
average power).
In most urban environments, there are many base-
stations, and so continuous readings of 1-3 V/m are
often found. In rural environments with no near
base-station, readings are usually below 0.2 V/m.
At 100m from a mast, you will typically find readings
of 1.5 V/m, falling to 0.5 V/m at 300m. Base-stations
have a “main beam” which directs the energy
sideways, but there are also various “side-lobes”
which can give high readings close to the mast.
Cars
Modern cars are increasingly a source of EMFs for
their passengers, due to inbuilt technology such as
Bluetooth. This can lead to much higher than
expected readings.