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IN & OUT SETTINGS (FM VERSION) ENG
Page 29
12.3 HOW TO CONFIGURE THE MPX OUTPUT (MPX MODULE SETUP)
12.3.1 SETTING THE PREEMPHASIS
The Mpx Module Setup / Preemphasis menu toggles between 50uS and 75uS of preemphasis applied to the
Falcon 15’s MPX output.
European countries use a 50 uSec preemphasis, while US countries use a 75 uSec preemphasis.
NOTE: FALCON 15 PREEMPHASIS REMAINS ACTIVE AT ALL TIMES AND CAN NOT BE
REMOVED FROM THE MPX OUTPUT
Only one pre-emphasis must be kept active in a transmitting chain. Turn always off the pre-emphasis generated
by transmitters.
NOTE: MAKE SURE YOU HAVE PREEMPHASIS SET TO THE APPROPRIATE VALUE FOR YOUR
APPLICATION BEFORE CALIBRATION AS THIS WILL AFFECT THE OUTPUT LEVEL
12.3.2 MONO - STEREO OPERATION
The MPX Module Setup / Mpx Mode menu selects the mono versus stereo operation of the composite output.
With Mono audio modes enabled, Pilot tone is automatically turned off.
In particular:
Selecting Mono (Left) will remove the L-R portion of the composite signal and simply output the left
audio input. The Pilot will be turned off
.
Selecting Mono (Left+Right) will remove the L-R portion of the composite signal and simply output the
sum of the left and right audio inputs. The Pilot will be turned off
.
12.3.3 ADJUSTING THE MPX OUTPUT LEVEL
The MPX signal (+ any internally or externally generated RDS signal) is available on the Bnc MPX OUT
connector.
We recommend connecting the processor output directly to the transmitter or radio link, without inserting any
other equipment. The factory preset for the overall MPX signal is 0 dBm.
Where necessary, this output may be tuned using the Mpx Module Setup / Output Level menu.
In order to best adjust the output level, we recommend enabling a pilot tone
, which identifies the maximum peak
which should match the deviation of 75 KHz. To do this: