Audio
Input
Level
Set
Audio
Input
connector
J-3
Input
Sleeve
ground
User Interface
Connectors
Power Input
And LED
Audio
In Clip
LED
Audio
Output
Level
Set
Output
Clip
LED
Audio
Out
Connector
J-1
Input Pad
J-2
Input
Gain
Select
Audio Input Jumper settings:
Input level = +8dBm: J1 & J2 = ON
Input level = +0dBm: J1 = ON/ J2= OFF
Input level = -10dBm: J1& J2= OFF
Sub-03a Connector & Controls Layout (Top View)
SETTING LEVELS:
The Sub-03a can accept a wide variety of input levels and its improved output driver can supply peak levels
of up to +18dBm into a 600 Ohm load. There are 2 jumpers associated with the input audio levels. If your
audio input is at +8 or more, both J1 and J2 should be on. If your input is at 0dBm, only J1 needs to be set.
If the audio input level is -10dBm or less, then both jumpers should be off. Whichever jumper setting you
choose should allow the maximum amount of input audio WITHOUT lighting the input clipping LED. The
Sub-03a has a maximum dynamic range of about 90dB. By selecting the highest input level that does not
cause clipping of the input stage, you are geting the maximum signal to noise ratio from the Sub-03a. Since
satellite programming is pre-limited, you may be able to use more aggressive input jumper settings to
maximize audio throughput. This is fine as long as the input clipping LED stays off. After setting the input
jumpers, adjust the input level control pot on program material until the Input Presence LED is lit 50-70%
of the time. This is the correct level range for the tone detectors to work. Finally, adjust the output level
control for the level that you want. This control is variable from 0 to about +18dBm. Be sure that the
output clipping indicator does not light, or you will have a distorted output.
Audio
Present
LED
Jumper
