USER MANUAL V1.01
EnOcean GmbH
Kolpingring 18a
82041 Oberhaching
Germany
Phone +49.89.67 34 689-0
Fax +49.89.67
34
689-50
[email protected]
www.enocean.com
Subject to modifications
PTM 240C User Manual V1.01
September 26, 2008 4:13 PM
Page 9/11
PTM 240C
L=15cm
3
APPLICATIONS INFORMATION
3.1
Antenna Mounting
Positioning and choice of receiver and transmitter antennas are the most important factors
in determining system transmission range. The PTM 240C modules are supplied with an-
tenna. For standard applications the use of a whip antenna is recommended (L=15cm).
This antenna enables a very compact unit with good radio characteristics. For mounting the
antenna, the following notes should be considered to optimize the system performance:
Mounting a 1/4-wave whip antenna:
For good transmit performance, great care must be taken about the space immediately
around the antenna since this has a strong influence on screening and detuning the an-
tenna. The antenna should be drawn out straight as far as possible and must never be cut
off. Primarily, the far end of the wire should be mounted as far away as possible from all
metal parts, PCB strip lines and fast logic components (e.g. microprocessors).
Do not roll up or twist the whip antenna!
To avoid possible damage to the module the end of the antenna should be insu-
lated.
Note that 315 MHz whip antennas do not show any directional effects under free-field ra-
dio-wave propagation conditions (spot-wise radiator).
Figure: Specification of whip antenna
