12
The SRX1200 Gain value range is 0-99 and is applied to
increase/decrease receiver sensitivity. Gain value is adjusted/selected
using the
Up
or
Down
Arrows
. The amount of gain increment or
decrement can be specified as described on Page 13.
The appropriate gain setting depends on prevailing local ambient noise
conditions at the intended study set. Increasing gain and sensitivity
better enables signal detection at reception limits of the system, but will
also amplify noise events. For autonomous data logging applications in
particular, gain setting adjustment represents an important
consideration during the calibration process, to optimize data collection
efficiency of your telemetry system. Use of the AGC (Adaptive Gain
Control refer to page 24) feature can also be helpful in compensating for
anticipated fluctuations in local ambient noise.
The power of the received signal is reflected in the SRX1200 as an RSSI
(Relative Signal Strength Indicator) value. For practical purposes, RSSI
values will range from low values, e.g, 10, for very weak signals to high
values, e.g. 210, for very strong signals. The RSSI value remains more or
less constant throughout this range, irrespective of the selected gain
setting, although receiver sensitivity increases or decreases based on the
gain value applied. This linear response assists in localizing presence of
instrumented animals and in calibrating multiple SRX1200 receivers that
may require different gain values.
FREQUENCY ADJUSTMENT
Frequencies is adjusted/selected using the
Up
or
Down
Arrows
. The
amount of increment or decrement is also selected through
SET
∆
for
frequency as described on Page 13.
When adjusting the frequency or gain manually during tracking
sessions, the receiver will increase or decrease the frequency (kHz) or
gain value based on the Frequency or Gain Delta increment selected.
Set
Frequency
increment via:
Set Delta > 1)Freq
Set
Gain
increment via:
Set Delta > 2)Gain
