Users manual
FA845
version 1.5
Envionic
15
2.2 Measurement with omni-directional antenna
Omni-directional antennas
Several omni-directional antennas are available separately:
A ANT-800 GSM (824-960, 1710-1990 MHz) and UMTS (1920-2170 MHz)
B ANT-2400 WLAN (2400-2483 and 5150-5825 MHz)
C ANT-400 TETRA (380-450 MHz)
For a omni-directional antenna (not included), the device should be held in a vertical position,
with the antenna pointing upwards. This will receive signals from all around you. Signals that
come from the direction behind your back will be displayed less strong, because these are
attenuated while travelling through your body.
Most signals have a “vertical polarization”. Due to this, a vertical position of the device and
antenna is optimal when using the non-directional antenna. Signals with “horizontal
polarization” can be measured by holding the device in a horizontal position.
The polarization of radiation might change when it is reflected from a metal object. Also, the
polarization of a signal can be somewhere between horizontal and vertical.
The measured levels with the ANT-800 and ANT-2400 antenna will be lower than measured
with the AL700 antenna, because the device is calibrated to work with the AL700 antenna.
(For the same radiation strength, a non-directional antenna will generate a smaller electrical
signal than a direction sensitive antenna like the AL700).
