TRANSIT ENTRY | INSTALLATION GUIDE
Read Range Control (Squelch)
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7
READ RANGE CONTROL (SQUELCH)
7.1
PRINCIPLE
The read range of the TRANSIT Entry can be controlled with the embedded squelch
function. The squelch references the received signal strength against the squelch
level setting. When the received signal strength is below the squelch level no
identification is possible. The received signal strength becomes higher when the
transponder approaches the reader. When the received signal strength exceeds the
squelch level the transponder will be identified.
Distance
Rec
ei
ved
si
gnal
s
trength
0 m
5 m
max read range
for this level
squelch level setting
Transponder signal < squelch level: no read
Transponder signal > squelch level: read
Squelch level
Transponder signal
Figure 23: Squelch principle
7.2
READ RANGE ADJUSTING
SQ-LVL potentiometer completely clockwise:
Maximum read range (squelch disabled).
SQ-LVL potentiometer completely counter-clockwise:
Minimum read range.
SQ-LVL
SQ-ACT
SQ-ENA
Figure 24: Squelch level setting
Two LEDs indicate the status of the squelch. When the squelch is enabled
(potentiometer SQ-LVL not completely clockwise) LED SQ-ENA will be on. LED SQ-
ACT is on when the transponder signal is below the squelch level (red area in Figure
23). In chapter 5 all LED indicators are described.
