I/O BASIC SETTINGS
ENG
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The digital input impedance may be set to 75Ohm, rather than the default 110Ohm, by moving the
associated jumper on the digital I/O board (see figure).
J1
110 OHM - AES/EBU
75 OHM - SPDIF
NB the digital I/O board is available as an option
13.3 50 US / 75 US OUTPUT PREEMPHASIS SETTING (FM VERSION ONLY)
The frequency characteristic of analog L & R outputs can assume either a flat frequency response, or can
follow a selected pre-emphasis curve, with or without subsequent de-emphasis.
When ‘flat’ mode is engaged, this yields a signal with a flat frequency characteristic, but with an output
ceiling that exactly follows the inverse of the pre-emphasis curve. Doing so, if the signal is again pre-
emphasized in an external stereo generator or exciter, the transmitted signal will have proper pre-emphasis
and spectral protection.
The actual pre-emphasis time is indicated on the Pre-emphasis menu (see section 19.7).
If, for some reason, the unit is to be operated at a preemphasis which is different to that 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), accordingly to the following table:
ANALOG OUTPUT MODE
MENU SELECTION **
JUMPER SETTING
Flat, fitting external 50 uS pre-emphasis
50uSec External
CN 17 and CN 18 in 50 uS position
Flat, fitting external 75 uS pre-emphasis
75uSec External
CN 17 and CN 18 in 75 uS position
Pre-emphasized, 50 uS
50uSec Internal
No setting required
Pre-emphasized, 75 uS
75uSec Internal
No setting required
13.4 MPX OUTPUT SETTINGS
The MPX board (which comes with the MPX option on the FM version) can support many I/O configurations.
Refer to the further Chapter for proper MPX card configuration.
Summary of Contents for Falcon 35
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