I/O CALIBRATION AND SYSTEM SETUP
ENG
Page 51
19.7 ANALOG OUTPUT PRE-EMPHASIS
The XLRs analog output is intended for applications requiring discrete L/R processed audio. The frequency
characteristic can follow a selected pre-emphasis curve, with or without subsequent de-emphasis. The
factory-default setting is with pre-emphasis engaged, accordingly to the destination country (50 or 75
uSec).
Whenever de-emphatization mode is set (ref to the EXTERNAL mode here below), the analog output
provides a signal with a flat frequency characteristic, but with an output ceiling that follows the inverse of the
pre-emphasis curve. Thus, if the signal is again pre-emphasized in an external stereo generator or FM
exciter, the transmitted signal will have proper pre-emphasis and spectral protection.
NOTE: The processor generates two types of pre-emphasis: dynamic and fixed. The former may vary in
relation to the modulation peak, thereby considerably increasing the average modulation within the maximum
deviation of 75KHz, while the latter is fixed at 50 or 75uSec depending on the country in which it is used. If
necessary, the latter may be removed from the analog audio outputs, while the first is always present to
ensure proper modulation at all times.
In summary, the following pre-emphasis settings are available:
75uSec External
Flat Response on the analog XLR output, requires external pre-emphatization of 75 uSec**
75uSec Internal
75 uSec pre-emphasized analog XLR output **
50uSec External
Flat Response on the analog XLR output, requires external pre-emphatization of 50 uSec**
50uSec Internal
50 uSec pre-emphasized analog XLR output **
** The
pre-emph.off
LED on the front panel glows when the External option is set.
To set the proper pre-emphasis mode:
DEFAULT SCREEN
OUTPUT CALIBRATION menu
PREEMPHASIS page
NOTE (FM version ONLY):
If, for some reason, the unit is to be operated at a preemphasis/de-emphasis which are
different to those as supplied, in addition to the menu setting, you need to open the top cover
and set properly the jumpers CN 17 and CN 18 on the outside of the I/O MPX board (left
board) outward (see picture below)
Summary of Contents for Falcon 35
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