Rainbow Electronics MG260 - Manual (Page 67)

MG260 Product Specification
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2.9.6 Audio interface
2.9.6.1 Microphone inputs
Internal audio filter characteristics
Frequency Gain
0-150 Hz < -22dB
150-180 Hz < -11dB
180-200 Hz < -3dB
200-3700 Hz 0dB
>4000 Hz < -60dB
The gain of MIC inputs is internally adjusted and can be tuned from 30 dB to
51 dB using an AT command.
Input Gain Range dynamic is splitted into 2 subranges:
e Controller 1 (subrange from 30 to 51 dB)
e Controller 2 (subrange from –6 to 10 & 30 to 51)
Tables hereafter give the microphone gain versus maximum input voltage for
each input gain subrange.
Microphone gain vs Max input voltage (using controller 1)
Transmit Gain (dB) Max Vin (mVrms)
30 43.80
33 31.01
36 21.95
39 15.54
42 11
45 7.79
48 5.51
51 3.9