User's Manual

DMR repeater 24/01/2011 Versione 1.1
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6.2.2.6 AUDIO LINES CONFIGURATION (FOR ANALOG USE OR FOR SYNCHRONIZATION AIM ONLY)
Clicking on RA-DMR 

 Radio configuration 

 Audio lines setting you can set the input and
output audio lines levels.
DMR users are interested only in using the section Line 1 .
It is possible to set nominal levels for input and output lines, high and low pass filters and delays. The input
signal in fact, after the analog to digital conversion, is regulated in amplitude according to the user’s settings.
The echo canceller is a filter that sums the output signal, after an appropriate phase correction, with the input
signal, in order to minimize signal reflection effects.
This function is selectable by checking Echo canceller
There are also band pass and notch filters to remove PTT and sync tones. The filters are automatically inserted
if you select a tone in the setup line section. You can define the level and the frequency of the used tones and
the filters are automatically aligned with the desired frequency. The extracted signals are sent to the decoding
tones block.
The Line delay block allows to delay the input signal up to 127 ms using a 2 us step. The processing chain
towards the balanced output is the reversal of the processing chain for an input signal.
The In Line and Out Line sections allow to specify the PTT, squelch, synchronism criterions setting the
level and the frequency of the signal.