Μmpx - Orban OPTIMOD 5750 Operating Manual

Orban 5750 Technical Manual
PTY Program Type – US
16 Rhythm and Blues Music
17 Soft R and B Music
18 Foreign Language
19 Religious Music
20 Religious Talk
21 Personality
22 Public Non-Commercial
23 College
24 Spanish Talk
25 Spanish Music
26 Hip-Hop
27 (unassigned)
28 (unassigned)
29 Weather
30 Emergency Test
31 Emergency!
SCA/Subcarrier Phase Relationship
During stereo broadcast, the SCA subcarrier must
be locked either in-phase or in quadrature to the
third harmonic of the 19 kHz pilot tone. The
tolerance of the phase angle is ±10° measured at
the modulation input to the FM transmitter.
With no modulation other than the pilot tone, an
oscilloscope trigged from the 19kHz pilot tone
should display the waveform as seen to the right.
To minimize the amount of peak level that the RDS
subcarrier adds to the composite baseband, your
OPTIMOD's RDS generator is locked in quadrature
with respect to the pilot tone, so the example
shown here is for reference only.
If your transmission system is broadcasting stereo
correctly, it will also correctly pass the phasing built
into your OPTIMOD's SCA generator.
µMPX
µMPX in its simplest form is AES-EBU digital audio sampled at 192 kHz. AES sampling is done at 44.1 or 48 kHz in
most all broadcast plants. µMPX allows the FM multiplex signal including baseband audio, pilot, stereo sub, RDS and
Table 3-5: Program Type (PTY)
Table 3-6: Pilot/SCA Phasing Scope Trace
Operation
Program Type – EU
Weather
Finance
Children's Programs
Social Affairs
Religion
Phone-In
Travel
Leisure
Jazz Music
Country Music
National Music
Oldies Music
Folk Music
Documentary
Alarm Test
Alarm!
3-37