OPTIMOD-AM DIGITAL INSTALLATION
2-9
Analog Audio Input
IMPORTANT: Because the 9400’s music/speech detector uses information
about the stereo sound field to make its detection more accurate, it is
important to feed the 9400 with stereo source material even if it is only
being used to drive a monophonic AM analog transmitter.
Nominal input level between –14dBu and +8dBu will result in normal operation
of the 9400.
(0dBu = 0.775Vrms. For this application, the dBm @600 scale on voltme-
ters can be read as if it were calibrated in dBu.)
The peak input level that causes overload is +27.0dBu.
The electronically balanced input uses an ultra low noise and distortion differen-
tial amplifier for best common mode rejection, and is compatible with most pro-
fessional and semi-professional audio equipment, balanced or unbalanced, hav-
ing a source impedance of 600 or less. The input is EMI suppressed.
Input connections are the same whether the driving source is balanced or unbal-
anced.
Connect the red (or white) wire to the pin on the XLR-type connector (#2 or #3)
that is considered H
IGH by the standards of your organization. Connect the black
wire to the pin on the XLR-type connector (#3 or #2) that is considered L
OW by
the standards of your organization.
In low RF fields (like a studio site), connect the cable shield at 9400 input only —
it should not be connected at the source end. In high RF fields (like a transmitter
site), also connect the shield to pin 1 of the male XLR-type connector at the 9400
input.
If the output of the driving unit is unbalanced and does not have separate
C
HASSIS GROUND and (–) (or LOW) output terminals, connect both the shield and
the black wire to the common (–) or ground terminal of the driving unit.
Analog Audio Outputs
There are two left/right output pairs (for two transmitters).
To drive a mono transmitter, use either the L or R output and run the analog-
chain processing in the M
ONO mode of your choice (MONO FROM L, FROM R, or
M
ONO FROM L+R).
Electronically balanced and floating outputs simulate a true transformer output.
Because of the built-in high-order EMI suppression filter, the source impedance is
351. The output is capable of driving loads of 600 or higher; the 100% modu-
lation level is adjustable with the AO 100% control over a –6 dBu to +20 dBu
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