Tait TB7100, Инструкция по установке и эксплуатации

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TB7100 Installation and Operation Manual Preparation for Operation 91
© Tait Electronics Limited December 2005
7.4.6 Audio Level Adjustment
There is no audio level adjustment necessary in repeater mode. The internal
linking is designed to produce a repeater with no talk through gain. If talk
through gain is required it can be implemented by linking back the audio
using a DB25 connector on the system interface and setting the audio levels
as required, see
“Alternate Talk Through Repeater Configuration” on
page 92 for a more detailed explanation.
7.4.7 Talk Through Repeater Functional Testing
The basic operation of the base station has already been tested as a line-
controlled base. This section describes the additional functional tests
required to verify that the base station is operating correctly as a repeater.
Repeater Key
With the test set in duplex mode:
1. Set up the test set to measure the transmitter power and frequency
output.
2. Set the RF signal generator to the correct frequency for the receiver.
Note
If subaudible signalling has been added, also modulate the carrier
with the required signal.
3. Set the RF level to -70 dBm.
4. The receiver busy LED turns on and the transmitter keys up and
transmits at the programmed power level and frequency. When the
RF source is removed, the transmitter will stop transmitting.
Talk Through
With the test set in duplex mode:
1. Set up the test set to measure the modulation level and frequency.
2. Set the RF signal generator to the correct frequency for the receiver.
3. Modulate the RF carrier with a 1kHz audio tone at 60% full system
deviation.
Note
If subaudible signalling has been added, also modulate the carrier
with the required signal.
4. Set the RF level to –70dBm.
5. The receiver busy LED turns on and the transmitter keys up and
transmits at the programmed power level and frequency.
The transmitted signal will be the same as received. If subaudible
signalling has been enabled, the required sub-tone will also be
transmitted.
6. Ensure the deviation is at the desired level.