SST NR-900S, User Manual

Page: 19 / 29

NR-900S Operation Manual 18
DETECTOR OPERATION IN ‘ LISTEN’ MODE
Switch over Detector to the ‘
LISTEN’
mode: LED is off.
Direct the device to the possible target position.
Control the audio signal in the headphone switching the button
2/3 to
obtain the 2
-nd
and the 3
-rd
harmonic reply. The presence of a certain
audio modulation in the reply signal indicates that the target is in an
active mode. Judging by the typical signal features try to identify the
device as a part of a target.
And if no reply signal was detected try to increase the receiver’s
sensitivity by ‘ ATT ’ button as well as boost the transmitter output by
‘ P ’ button and only after that (in case of no reply) start moving in a
chosen direction.
DETECTOR OPERATION IN ‘ SEARCH ’ MODE
- Switch on Detector and carry out its workability test referring p.16
of this Manual.
- Switch over Detector to the ‘ SEARCH’ mode (LED is on).
- Push ATT button to adjust maximal receiver sensitivity.
-
Direct Antenna head to the questioned area starting from the close
proximity. Check the ambience scanning it from left to right step-by-step
expanding the zone of inspection tilting-up Antenna module.
- If there is no visual indication on
2
nd and/or
3
rd bar-graph display
and no audio signal in the headphones – push
‘P’
button to increase
probing signal level to maximal if necessary.
- When the reply signal appears, identify the signal source (target)
location by the peak level of the
2
nd &
3
rd harmonic display and the
maximal sound level in the headphones. If necessary decrease the
receivers sensitivity by means of button ATT .
- Start moving towards the target adjusting (if necessary) probing
signal level and receivers sensitivity by means of P and ATT
buttons.