INSTALLATION
2-9
Because of the importance of proper ratings encoder operation, your Optimod will
flash a warning on its screen and on PC Remote if it enters the fallback mode. This
will help detect potential failures in the ratings encoder hardware.
All 8600 units manufactured before April 2013 require a minor hardware modifica-
tion to support ratings encoder loop-through operation. The modification consists
of adding one jumper and removing one resistor. Field Engineering Bulletin #2,
downloadable from
ftp.orban.com/8600/Field_Engineering_Bulletins
, provides re-
work instructions.
CAUTION: You will be working on a surface-mount circuit board, so to avoid damag-
ing the circuit board you must perform the rework with tools and procedures com-
patible with surface-mount rework. Do not attempt the rework if you are not skilled
in these procedures. Your warranty does not cover damage caused by incorrect re-
work tools or procedures.
Orban can perform this rework for a flat fee of $100. If you are in doubt, please con-
tact Orban customer service to obtain a Return Authorization. See
starting on page 5-12.
Composite Output and Subcarrier Inputs
There are two
composite outputs
. These carry the encoded stereo signal, the ste-
reo pilot tone, and any subcarriers that may have been applied to the 8600’s subcar-
rier inputs.
Each output’s level is independently adjustable from –13.7 dBu to +10.6 dBu.
The output impedance of composite output #1 and composite output #2 can be set
to 0
Ω
or 75
Ω
via jumpers J2 and J3 respectively (located on the I/O Board). As
shipped, the link is on pins 3 and 4, yielding 0
Ω
impedance. To reset a given output
to 75
Ω
, place the link on pins 1 and 2 of its associated jumper. (See the schematic on
page 6-56 and the parts locator diagram on page 6-53.)
Each output can drive up to 75
Ω
in parallel with 0.047
µ
F before perfor-
mance deteriorates significantly (see Figure 2-3on page 2-10).
Connect the 8600’s composite output to the exciter input with up to 100 feet
(30.5m) of RG-58 / U or RG-59 / U coaxial cable terminated in BNC connectors.
Longer runs of coax may increase problems with noise, hum, and RF
pickup at the exciter. In general, the least troublesome installations place
the 8600 close to the exciter and limit the length of the composite cable
to less than 6 feet (1.8m).
We do not recommend terminating the exciter input by 50
Ω
or 75
Ω
un-
less this is unavoidable. The frequencies in the stereo baseband are low
by comparison to RF and video and the characteristic impedance of coax-
ial cable is not constant at very low frequencies. Therefore, the transmis-
sion system will usually have more accurate amplitude and phase re-
sponse (and thus, better stereo separation) if the coax is driven by a very
low impedance source and is terminated by greater than 1k
Ω
at the ex-
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