User's Manual

DMR_Manager Operating Manual 2011/07/04 Version 1v2
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Page 32 of 51
HP filter
It is a programmable high pass filter that can be inserted at the transmitter. It is used to
eliminate the received sub-audio.
LP filter
It is a programmable low pass filter that can be inserted at the transmitter. It is rarely used
to limit the bandwidth of the receiver output.
Notch
The notch filter, if enabled, is automatically set on the frequency of sub-audio tone
transmission. It may be useful for reducing the phase distortion in simulcast networks with
a sub-master (it is factory set for a given application).
Equalization
Allows to insert a filter that equalizes the phase and amplitude response of the transmitter
in the whole bandwidth (except for the sub-audio tone frequency). It is used in simulcast
networks and it is set in the factory if necessary.
Delay
allows to set a delay on the transmitted signal up to 127 ms
This functionality is organized as follow:
1. Off: the filter is not active.
2. On: the filter is active, with minimum delay 1.938ms.
Set: the delay is selectable in the range 0 to 127ms (minimum+1.938ms), step 4 s.
The settings specified in Parameters of transmission will not be effective (they come from the settings
in the channels table).
To enable these functions click on Set ; All the parameters will assume their original values if you restart the
device, unless you perform a Save in eep operation (see the DMR LAYER CONFIGURATION paragraph).
6.2.2.4 RX CONTROL
Clicking on RA-DMR  Radio configuration  RX control you can adjust the setting of the receiver:
it is possible to choose how to demodulate the received signal, set the squelch opening, enable some filters
(low pass and high pass) and set a time delay.
To enable these functions click on Set ; All the parameters will assume their original values if you restart the
device, unless you perform a Save in eep operation (see the DMR LAYER CONFIGURATION paragraph).