Siemens SIMATIC RF600 System Manual page 139

Radiation diagram (horizontal)
Europe (ETSI)
The radiation diagram is shown for horizontal alignment and for a center frequency of 865
MHz. Horizontal antenna alignment is provided when the TNC connection on the antenna
points vertically up or down.
The radiating/receiving angle of the antenna is defined by the angle between the two -3 dB
points (corresponding to half the power referred to the maximum performance at a 0° angle).
The optimum radiating/receiving angle is therefore approximately ±30 degrees.
Figure 6-2 Directional radiation pattern of the antenna (at 865 MHz, horizontal alignment)
SIMATIC RF600
System Manual, 10/2009, J31069-D0171-U001-A8-7618
Antennas
6.1 RF660A antenna
139