dB PM 1000 - Stereo Encoder Board (;S Option); Channels Pre-Emphasis Setting

DB ELETTRONICA TELECOMUNICAZIONI S.p.A.
PM 1000 – 1 kW FM Broadcasting Transmitter - USER’S MANUAL
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11. STEREO ENCODER BOARD (/S Option)
11.1 CHANNELS PRE- EMPHASIS SETTING
RIGHT CHANNEL PRE-EMPHASIS
(see Fig. 11.3 and Fig. 11.10)
To change the pre-emphasis, you need to set (or change position of) the JP3, JP4 jumpers on the
STEREO encoder board.
To disable preemph you have to remove both jumpers; to get a 50 us preemph, you have to insert
only JP3; if you want a 75 us preemph both JP3 and JP4 must be inserted.
LEFT CHANNEL PRE-EMPHASIS
(see Fig. 11.3 and Fig. 11.10)
To change the pre-emphasis, you need to set (or change position of) the JP5, JP6 jumpers on the
STEREO encoder board.
To disable preemph you have to remove both jumpers; to get a 50 us preemph, you have to insert
only JP6; if you want a 75 us preemph both JP5 and JP6 must be inserted.