GatesAir Intraplex PTR-255 - Programmable Gain Settings: SW1, SW2, SW8, SW9

GatesAir PTR-255 Program Audio Codec Module
Intraplex Products Issue 2.1, February 2006
27
3.6 Programmable Gain Settings: SW1, SW2, SW8, SW9
0
1
2
3
4
5
6
7
8
9
A
B
C
D
E
F
Figure 3-7
Gain Switches – SW1, SW2, SW8, SW9
Four 16 position rotary switches set the gain in the analog section of the card:
 SW8, Left channel input sensitivity (TX Gain Left)
 SW9, Right channel input sensitivity (TX Gain Right)
 SW1, Left channel output gain (RX Gain Left)
 SW2, Right channel output gain (RX Gain Right)
The input sensitivity switches set the level at which the input audio signal will produce a digital
full scale in the A/D encoder. The output gain switches set the maximum output level that the
D/A decoder will create before clipping (in other words, the interpreted value of a received digital
full scale signal). These settings are defined in Table 3-9.
The factory default setting for these four switches is B, providing a maximum peak level before
clipping of +20 dBu.