D3.12 Installation and Configuration M8SL2-00-002-812
© Copyright Tait Electronics Limited August 2004. All rights reserved.
Note: The monitor speaker is forced on in this mode so that the test-microphone
may be used as an intercom to communicate to the dispatcher room (See
Section 3.2.2).
Using PGM800 software:
1. Determine the output level of the console. This may be a preset or default value
specified in the console’s manual or a value programmed by the operator.
2. Determine the actual line-loss between the console and the T803.
3. Calculate T803 Line-In Level as follows:
T803 Line-In Level = console output level (dBm) – Line-loss (dB)
4. Program the T803 with the calculated level.
Example case:
Console output level =–13dBm
Measured Line loss = 6.5dBm
T803 Line-In level =–13 – 6.5 = –19.5dBm
3.2.4.3 Rx Audio – Audio Level from Receiver to T803
The Rx Audio level is adjusted using either the Line Level control on the front of the
receiver or the RV2 potentiometer on the backplane, depending on the configuration of
the link LN8 on the backplane.
The recommended (and default) configuration of LN8 is with pins 2–3 and 4–5
linked. With this configuration the balanced audio from the receiver (Rx-Line-1 and Rx-
Line-4 ) is changed to unbalanced audio for the T803 (this means the Rx Line output can
no longer be used as direct balanced audio to the transmitter). The level to the T803 is
adjusted using the Line Level control on the front of the receiver. The advantage of
using this path is that it allows CTCSS filtering to be applied (using the receiver’s inter-
nal CTCSS filter. See Section 3.5 in Part B).
Alternatively if CTCSS is not used, the receiver unbalanced audio output (Rx-Audio-1)
can be used to provide audio to the T803 by linking pins 1–2 on LN8. In this case the
level to the T803 is adjusted using the RV2 potentiometer on the backplane. This audio
path is not suitable for CTCSS systems because complete CTCSS filtering cannot be
applied. The only filtering directly available is the optional receiver de-emphasis filter-
ing. See Section 3.5 in Part B. The T803 does however apply a 160Hz to 3kHz high pass
filter resulting in an overall audio response for this path very similar to the default high
pass filtered receiver balanced Line output. See the table below.
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