Tait T800 SL2 25W, Service Manual

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M8SL2-00-002-812
Installation and Configuration D3.7
© Copyright Tait Electronics Limited August 2004. All rights reserved.
3.2 T803 Configuration
Before using the T803, line input (the level from the receiver) and output level (the level
presented to the radio transmitter) need to be properly configured.
Figure 3.2 T803 setup
The Line-In/Line-Out levels can be set up using either the programming application
(PGM800Win) or the test modes of the T803 (accessed via the buttons on the front panel.
See Section 3.2.3). The advantage of the test mode method is that it can provide a direct
test of the system. The programming method is required when access to the dispatch
console is difficult.
Using the test modes, the T803 levels are set up using actual signals present on the line.
For the Line-In level, the test tone and keytone, are generated by the dispatch console
and sent to the T803 via the leased line (or an audio generator could be used with the
line loss simulated). For the Line-Out level, the test tone is generated by the T803.
Programming the Line-In/Line-Out levels using PGM800Win does not require any con-
nection to the line. However, input/output specifications of the dispatch console and
actual line loss must be known so that the T803 levels can be properly calculated and
programmed.
Setting up receiver and transmitter levels can only be done using T803 test modes and/
or measurement. These levels are not programmable.
Line in
Line out
Line In configured using
PGM800Win or T803 Test mode.
Line Out configured using
PGM800Win or T803 Test mode.
Dispatch
Console
Audio level from Rx to T803 adjusted
using RV2 on backplane or Line
Level control on Rx. (230mV )
See Section 3.2.4.3.
rms
Tx
T803
Audio level from T803 to Tx adjusted
using Line Sensitivity control.
(for 60% full system deviation)
Rx
Base Station