DEVA Broadcast DB4005, Инструкция по техническому обслуживанию и эксплуатации

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TUNER SETTINGS SCREEN
The Tuner Section gives full control over Tuner and Audio Processing and the RF Antenna
Inputs settings.
These settings provide all the needed adjustments to the algorithm which DB4005 demodulates
and manipulates the signal.
Antenna 1/Antenna 2 Attenuator Mode
– Allows attenuator mode depending on the location
of the device to be selected. :
- It is possible to choose the preset attenuation value or Auto - device will automatically choose
the proper set-up;
RDS/RBDS Mode – Depending on the client’s preferences, the deviation could be measured
in % [RBDS] or in kHz [RDS].
Tuner Frequency Step and De-emphasis – User defined frequency step and De-emphasis
could also be set, where the default values are 50 kHz Frequency Step and 50µs De-emphasis.
Average & Peak Adjustments Section is used for setting of the indicators response times.
- Attack time and Release time set the rate in which the indicators’ level will change in response
to the signal. For most of the applications (including this one), the recommended attack time is
shorter than the release time.
-
Peak-hold time
– Permits retaining and displaying the peak value reached by the signal for a
period of time predefined by the user, in milliseconds.
Audio Processing – If set to Auto, these settings depend on the quality of the received signal
(RF Level, Multipath, and etc.). If any changes in the signal are detected, the unit will automatically
adjust to the correct values.
- Stereo Blend – reduces the stereo separation if the received signal is bad;
- High Blend – applies low pass filter to the L-R audio levels;
- High Cut – applies low pass filter to the L+R audio levels;
- Soft Mute – reduces the level of the audio if the RF level is too low.