Antex Electronics SX-26 Digital Audio Adapter - Manual (Page 14)

11
SX-22, SX-23e, SX-26
There are 5 external connectors located on the SX-22 audio
board's metal mounting bracket. There are 7 external connectors
on the SX-23e/SX-26. See Figure 6, 7 & 8 for more information on
the SX-22/SX-23e/SX-26 connectors.
Audio Input:
Line:
SX-22:
Balanced - Nine pin D connector (-10dBu, +4dBu and
+16dBu - software selectable) with an impedance of 20k
ohms.
The SX-22 balanced analog I/O levels are specified in dBu,
where 0 dBu is 0.775 Vrms or 2.19Vpp for a sinewave. If
an I/O is connected as unbalanced then the level is 1/2 the
balanced I/O. The adjustable level is referred to as Trim.
The following Trim settings are available on the SX-22.
VdBu VRMS VPP VRMS-if connected as
unbalanced
-10 0.245 0.693 0.12
+4 1.23 3.47 0.6
+16 4.89 13.8 2.4 -(approx the same as
SX12a/20 unbalanced I/O)
The input and output trims may be adjusted separately, but
both input or both output channels must have the same
setting.