V01.00 | 2019/04
27
7.1.6
Setting antenna power
The antenna power of the read/write head can be set for the specific application. The radiated
power for the integrated antenna can be entered directly in the DTM. The power must be calcu-
lated for external antennas.
The following parameters must be used to calculate the radiated power (P
ERP
):
P
cond
Power to be output at the TNC socket of the read/write head
dB
Cable attenuation
G
HW
Antenna gain of the external antenna
NOTE
Refer to the data sheets of the components used for the cable attenuation and an-
tenna gain.
Fig. 24: Power calculation – Relevant variables (schematic representation)
The power can be calculated with the following formula:
P
ERP
= G
HW
- dB + P
cond
Setting antenna power – Restrictions of radio regulations
Some national regulations restrict the degree of freedom available for creating an RFID system.
You as the operator are responsible for ensuring that regulations are observed.
n
ETSI
– Radiated power P
ERP
: Max. 33 dBm ERP
n
FCC
– Radiated power P
ERP
: Max. 36 dBm EIRP
– P
cond
: Max. 30 dBm with antenna gain G
HW
≤ 6 dbi
NOTE
The DTM indicates impermissible configurations with an exclamation mark. A trans-
mission to the device is prevented.
Summary of Contents for TN-UHF LNX Series
Page 1: ...Your Global Automation Partner Instructions for Use TN UHF LNX UHF Read Write Head ...
Page 2: ...2 Hans Turck GmbH Co KG T 49 208 4952 0 F 49 208 4952 264 more turck com www turck com ...
Page 75: ...V01 00 2019 04 75 Select RS485 RFID and confirm with OK Fig 62 Selecting the RS485 interface ...