Commissioning
Parameterizing read/write heads with the DTM
34
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Calculating radiated power
The effective radiated power (ERP) is the power that is radiated from an antenna into free
space. To make it possible to compare the technical properties of different antenna, the power
specifications given are always in relation to a reference antenna.
n
EIRP = equivalent isotropic radiated power (reference: isotropic antenna)
n
ERP = effective radiated power (reference: with the length of λ/2)
The radiated power can be stated in watts or in dBm. The following table shows approximate
values as a guide for converting between dBm and mW:
dBm
mW
dBm
mW
dBm
mW
dBm
mW
1
1.25
9
8
17
50
25
316
2
1.6
10
10
18
63
26
400
3
2
11
13
19
80
27
500
4
2.5
12
16
20
100
28
630
5
3
13
20
21
125
29
800
6
4
14
25
22
160
30
1000
7
5
15
32
23
200
…
…
8
6
16
40
24
250
33
2000
The formula for calculating the exact values is:
dBm = 10 × lg (P/1 mW)
Converting antenna gain
The antenna gain can be specified in the following units:
dBd
Antenna gain in relation to a dipole
dBi
Antenna gain in relation to an isotropic radiator (linear)
dBic
Antenna gain in relation to an isotropic radiator (circular)
The different units can be converted as follows:
n
G
HW
= dBd
n
G
HW
= dBi - 2.15
n
G
HW
= dBic - 5.15
Summary of Contents for TN-UHF AUS-CDS Series
Page 1: ...Your Global Automation Partner Instructions for Use TN UHF CDS 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 97: ...V02 00 2020 08 97 Transfer the mapping to the POU Fig 94 Transferring the mapping to the POU ...
