TECHNICAL DESCRIPTION AND OPERATING MANUAL ST131 <PIRANHA II> and ST131N
48
The radiated phone set power depends on the distance to the base station and amounts from
hundreds of milliwatts to microwatts.
DECT
To listen and transfer the information there can be used, for
example, phone sets with function of listening rooms or "baby
monitor".
Detection range of the base station and phone set is about
five meters (different variants with specially reduced radiated power
are possible).
For visual identification of the signal, press the button
and compare oscillogram with the trace shown in Figure 48. To carry
out cursor measurements, click on the rotary knob. At presence of DECT receiving signals at the
reception point from several sources of oscillogram they displayed on the screen randomly, but with a
period equal of about 10 ms and duration time of about 0.4 ms.
Since the DECT frequency range of cell phone and base station is the same, they will be visible
in the oscillogram simultaneously.
2.4 GHz (WLAN + BLU other license-free data transmission standards).
Before using the ST131 it is recommended to evaluate the state of ether of this range.
Information on the status and number of PC connections to "own" network or peripheral devices is on
the inner site of router or network administrator.
For the analysis of "alien" connections, use one of many different programs of monitoring and
analysis. This type of program usually displays the following information: number of access points, used
channels, the signal level at the receive point, the MAC addresses, etc.
WLAN
This standard can be used for:
data transmission from PC. Time and bandwidth are
uncertain.
Video surveillance. WLAN video camera characterized with
high traffic and a relatively large emitted power. Working
time corresponds with events in the monitored area. Screen
picture when you receive such a signal is shown in Figure
49.
BLUETOOTH
Using this standard is possible with the following variants of unauthorized transfer of information:
transfer data from PC, notebook, phone, smartphone, etc.
Figure 48
Figure. 49
