TB8100 Service Kit User’s Manual Reciter Tests 179
Testing Digital Inputs
The Digital inputs area displays the current state of all digital inputs to the
reciter. In addition, the Tx Key input state is displayed below.
A digital input can be active
(red LED) or inactive (gray LED). Many of these
inputs can be configured as channel select lines. The Hardware channel
number box indicates the channel number that they currently select.
To test a digital input
1. Select Diagnose > Reciter > Digital I/O.
2. Using the equipment connected to the digital input, toggle the state of that
input.
3. In the Digital inputs area, check that the state of that input changed.
Detecting Subaudible Signalling
You can monitor the current channel for any subaudible signalling. This is a
useful diagnostic tool if the base station is not opening the receiver gate to
transmissions with subaudible signalling as expected.
To detect subaudible signalling
1. Select Diagnose > Reciter > Subaudible Scan.
2. Click Start Monitoring.
The form will now display ‘Scanning...’ If any subaudible signalling is
received, its type and modulation frequency or code is displayed.
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