11
For Technicians | AfiPass II Installation Guide
Positioning the Antenna
The antenna ID range can be controlled by changing the antenna orientation or adjusting the
antenna transmission power.
Each side of the antenna projects a different range, as illustrated in Figure 1:
•
A
– illustrates the range projected from the front and back of the antenna.
•
B
– illustrates the range projected from the sides of the antenna.
•
C
– illustrates the range projected from the top and bottom of the antenna.
Figure 1 – Antenna ID Range (Side and Front Views)
Antenna range is adjustable via the AfiPass II Controller (see Chapter 8.4). Increasing the
transmission power increases the ID range on each side of the antenna. In turn, this increases the
distance available for the antenna to successfully detect the ID Tag. (However, it may also increase
the risk of detecting incorrect tags of neighboring cows.)
Table 6 below illustrates how increasing the antenna transmission power increases the range
projected on each side of the antenna. Table 6 also compares the different ranges available for the
50 cm and 40 cm antennas.
Table 6 – Antenna ID Coverage Range for ISO ID Ear Tags
Antenna
Transmission Power
Side A
Side B
Side C
50 cm
Antenna
40 cm
Antenna
50 cm
Antenna
40 cm
Antenna
50 cm
Antenna
40 cm
Antenna
Minimum Range
25-30
cm
(10"-12")
20-25 cm
(8"-10")
16-22 cm
(6"-9"
)
15-20 cm
(6"-8")
12-16 cm
(5"-6")
10-14 cm
(
4"-6")
Medium Range
55-60 cm
(
22"-24")
50-55 cm
(20"-22"
)
35-40 cm
(
14"-16")
30-35 cm
(12"-14")
28-32 cm
(11"-13"
)
26-30 cm
(
10"-12")
Maximum Range
75-85 cm
(30"-33"
)
65-70 cm
(
26"-28")
45-50 cm
(18"-20"
)
40-45 cm
(16"-18")
38-44 cm
(
15"-17")
34-38 cm
(13"-15")
