OPTIMOD-FM DIGITAL
INSTALLATION
2-9
Designed to be installed adjacent to each exciter, the CIT25 Composite
Isolation Transformer provides ground loop isolation between the 8300
composite output and the exciter’s input, and presents the 8300 with a
balanced, floating load.
Even when its composite limiter is being used heavily, the 8300 will al-
ways protect the stereo pilot tone by at least 60 dB (
250Hz from 19 kHz)
and will protect the region from 55 kHz to 100 kHz by at least 75 dB (re
100% modulation).
Figure 2-3: Separation vs. load capacitance
The
subcarrier inputs
are provided for convenience in summing subcarriers into
the baseband prior to their presentation to the FM exciter.
The subcarrier inputs will accept any subcarrier (or combinations of sub-
carriers) above 23 kHz. Below 5 kHz, sensitivity rolls off at 6 dB/octave to
suppress hum that might otherwise be introduced into the subcarrier in-
puts, which are unbalanced.
The subcarrier inputs are mixed into the 8300’s composite output in the
analog domain, after D/A conversion of the 8300 stereo encoder’s output
but before the digitally controlled attenuators that set the composite
output levels.
As shipped from the factory, the second SCA connector emits a
stereo pilot tone
reference
for RDS or RBDS subcarrier generators. If you wish to reconfigure it to ac-
cept an SCA signal, move the link on jumper J400 (on the I/O board) from pins 3 and
4 to pins 1 and 2.
To access J400, remove the 8300’s top cover according to the instructions
in step 1 on page 4-2. To find J400, see page 6-46 for the I/O board parts
Summary of Contents for 8300J
Page 1: ...Operating Manual OPTIMOD FM 8300 Digital Audio Processor Version 2 1 Software...
Page 7: ...Operating Manual OPTIMOD FM 8300 Digital Audio Processor Version 2 1 Software...
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Page 247: ...OPTIMOD FM DIGITAL TECHNICAL DATA 6 29...
Page 254: ...6 36 TECHNICAL DATA ORBAN MODEL 8300 CPU Module...
Page 260: ...6 42 TECHNICAL DATA ORBAN MODEL 8300 8300 RS232 BOARD PARTS LOCATOR...
Page 262: ...6 44 TECHNICAL DATA ORBAN MODEL 8300 8300 POWER SUPPLY PARTS LOCATOR...
Page 264: ...6 46 TECHNICAL DATA ORBAN MODEL 8300 8300 I O BOARD PARTS LOCATOR...
Page 270: ...6 52 TECHNICAL DATA ORBAN MODEL 8300 DSP BOARD PARTS LOCATOR DRAWING 32170 000 14...
Page 278: ...6 60 TECHNICAL DATA ORBAN MODEL 8300 8300 DISPLAY BOARD PARTS LOCATOR...
Page 279: ...OPTIMOD FM DIGITAL TECHNICAL DATA 6 61 DISPLAY BOARD...