HARTING Ha-VIS RF-R500, Инструкция по сборке

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17
Ha-VIS RF-R500 - Assembly Manual / Issue 1.0
Operating and Display Elements
English
Example:
Radiated Power 2.0 W (e.r.p.) <> 33,0 dBm
correction factor ERP -> EIRP * 1.64 + 2.1 dB
Radiated Power Isotorp = 3.28 W (c.i.r.p.) = 35.1 dBm
Antenna Gain 11.0 dBic - 11.0 dBi
Type of antenna ** 1 + 3.0 dB
Cable losses / 100 m 30.7 dB
Cable losses / 1 m 0.3 dB
Length of the antenna cable * 6 m
= 1.8 dB + 1.8 dB
Radiated Power in dB 29.0 dBm
Output power in mW 786 mW
Configuration in the Reader (CFG3) ≤ 0.8 W
Table 13 Calculation of the output power
** linear antenna = „0“, circular antenna = „1“
In Table 13: Calculation of the output power the allowed antenna power is shown for the use of
the antenna Ha-VIS RF-ANT-WR80-30-EU and a 6 m long Belden H155 coaxial cable.
4.3.2 U.S. Readers
According to the U.S. approval, Title 47, Part 15, a maximum output power P
Out
of 1 W (30 dBm)
is allowed to apply to the SMA connector of the reader. The power radiated from the antenna
may not exceed a value of 4 W e.i.r.p.
If antennas with a higher antenna gain than 6 dBi (9 dBic) are used, the length of the antenna
cables may not go below a certain value. In case a circular antenna is used, then 3 dB
from the antenna gain [G] = dBic may be deducted. This is true when using the antenna
Ha-VIS RF ANT-WR80-30-US . In such a constellation, the following calculation for the damping
of the antenna cable applies:
Damping of cable (in dB) = P
Out
+ antenna gain (in dBi) – 36 dBm (4 W e.i.r.p.)
Damping of cable (in dB) = P
Out
+ antenna gain (in dBic) – 3 dB – 36 dBm (4 W e.i.r.p.)
The antenna gain of the circular polarized antenna Ha-VIS RF-ANT-WR80-30-US is 10.5 dBic.
This relates to a gain of a linear antenna of 7.5 dBi (10.5 dBic – 3dB).
This results in a minimal damping of the cable of a
min
:
a
min
= 30 dBm + 7,5 dBi – 36 dBm
a
min
= 1,5 dB