Radina U2
User Manual v2.2
Inova-bg Ltd. 2012
Page 8 of 10
4.
Hardware reset
In case you changed the settings and can’t reach the device or if you forgot your password,
Radina U2 is capable to return to its factory defaults. For this purpose you must disconnect
from power supply, push and hold the button for hardware reset and reconnect to the power
supply. Hold the button for 5 seconds until the LED is blinking. Once the LED goes off you
can release the button and connect to the device.
5.
How to determine the height of the antenna
The height of the antenna is determined by the radio frequency. If you use more than one
radio frequency – make a compromise between all the frequencies. Put the antenna on its place,
remove the plastic cap on the top – start measuring from the end of the box.
Height, cm = 7500 / Frequency, MHz : L
cm
= 7500 / F
MHz
Frequency F
MHz
Formula
Height of the antenna L
cm
400.0000 MHz
7500 / 400
18.75 сm
410.0000 MHz
7500 / 410
18.29 сm
420.0000 MHz
7500 / 420
17.86 сm
430.0000 MHz
7500 / 430
17.44 сm
440.0000 MHz
7500 / 440
17.05 сm
450.0000 MHz
7500 / 450
16.67 сm
460.0000 MHz
7500 / 460
16.30 сm
470.0000 MHz
7500 / 470
15.96 сm
L
cm