Technical description and operating manual ST 167 and ST167W5
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Max authorized RD signal level (2.4 GHz) is 20dB (100mW), router – 26dB (400mW). Max RD working distance
– up to 400m. In building, with acceptance of weakening given in table, is about 50 meters.
Used frequency ranges are concerns to microwave radiation and have relatively high weakening when passing
through the buildings. For 2.4GHz range the following values can be seen:
Element
Weakening, dB
Window glass
3
Window glass with metallization
6
Wood wall
12
Interior wall
18
Bearing wall
22
Concrete floor/cealing
22
More of that, when signal passing the wall on 25 degrees its losses doubles, but with angle of 2 degrees
wall width for the signal becomes more than 20 times bigger.
TRAFFIC
For traffic indication, data transfer should be implemented (Downloading is considered as data receiving
and not detected by ST167). Average level of working with internet traffic – up to 10%. Depending on WLAN
camera type and dynamics of image change, traffic can be from 10% to 100%.
BLUETOOTH
The use of this standard is possible, for example, in the option of transmitting audio information using a
BLUETOOH headset.
The radiated power of devices of this standard varies from relatively high - tens of milliwatts (data
transfer) and hundreds of microwatts (wireless headset cell phones). An additional detection complexity is the
FHSS with a band of 1 MHz in the entire ISM band 2.4 GHz - 80 MHz (79 channels).
Setting
Before setting up, turn off all sources of Bluetooth signals - smartphones, headphones, speakers, etc. Switch
to manual Bluetooth mode.
The setting takes place in the submenu “Bluetooth” (submenu “Threshold ..” - “Bluetooth”). Two sliders are
used for tuning
The separation of the settings into two parts is due to the need to separate the
Bluetooth signal from WiFi having the same frequency range. After detecting the sum of
these signals (exceeding the threshold is set to “Bluetooth 2”), a mathematical operation
is performed which results in the probability of finding the Bluetooth signal in the sum of
these signals (the probability threshold is set to “Bluetooth 1”).The threshold levels are
set high by default - approximately for an office in the area of which at least ten WIFI
routers work (Fig. 36).
To achieve the maximum detection range, the displayed probability value should be
about 5%, with the minimum threshold “Bluetooth 2” for these values. The leftmost position of the “Bluetooth 2”
slider corresponds to the minimum threshold (maximum sensitivity), the right, respectively, to the maximum
threshold and minimum sensitivity.
Рис.36
