Use and maintenance manual
Page 52
Engineering Department PHONE: +39 0532 829 965 - FAX: +39 0532 829 177
E-Mail: support@elenos.com
4. GENERAL DESCRIPTION
4.8.2.
Stereo Encoder Board
This board digitally genera-
tes the 19 KHz pilot carrier
and the suppressed carrier.
It fits in the slot indicated
on page 7.
It features a BNC connector
for supplying the signal to
other transmitters.
Adjustments:
adjustment (trimmer) of the pilot tone (8-12%)
adjustment (trimmer) of the MPX signal clipper threshold before being added to
the pilot carrier
ON/OFF (jumper) of the clipper
adjustment (trimmer) of the MPX level on the output of the board
adjustment (trimmer) of the phase of the pilot tone with respect to the suppressed
carrier
adjustment (2 trimmers) of the equaliser of the sum of the signals (L+R) to obtain
maximum separation
adjustment (trimmer) of the suppressed carrier level (greater than 90 dB))
ON/OFF (sofware) of the clipper
ON/OFF (software) of the pilot carrier
selection (software) stereo/mono
Technical data
PRE-EMPHASIS 50/75 us +/-0.1dB
FREQUENCY RESPONSE +/-0.15dB (30Hz - 15KHz)
STEREO SEPARATION typically 65dB @ 1KHz
PILOT TONE Frequency: 19KHz +/- 1Hz deviation
7.5KHz adjustable
AUDIO INPUT MODULE L/R Input impedance: 10KOhm -
600Ohm (selectable) balanced input
Frequency response: 20Hz - 15KHz
Adjustment: -12 - +12dB in steps of
0.1dB
Connector: XLR female
ATTENUATION AT 19KHz 45dB
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