Orban OPTIMOD-FM 8500S Operating Manual page 108

2-52
INSTALLATION
mand to the 8500S when the on-air transmission chain is swapped.
•
If a non-existent control value, and/or an invalid passcode is entered, the 8500S
will ignore the command.
•
You can apply this command anytime after the 8500S boots up. The 30-minute
timeout does not apply.
4. To change the polarity of the analog FM processing's output:
Command
FM XXXXXXXX[PASSCODE]
In the above table:
•
For an explanation of why this can be useful, see step 8 on page 2-29).
•
If a non-existent control value and/or an invalid passcode is entered, the 8500S
will ignore the command.
•
You can apply this command anytime after the 8500S boots up. The 30-minute
timeout does not apply.
•
In HD Radio installations, this command is useful when switching the 8500S be-
tween transmitters if the transmitters' exciters produce opposite FM modulation
polarities when driven by identical digital audio input signals. This setting affects
any output emitting the analog FM processed signal, including the composite
output.
5. To select the analog or digital input as the audio source:
Note: When the input is set to D
input, the setting of the DI A
Optimod automatically switches to its analog input. See step 6 on page 2-28.
Command
IN X[PASSCODE]
Response
(valid passcode and argument)
FM POLARITY is set to XXXXXXXX
(invalid passcode)
[no error message is issued]
XXXXXXXX = POSITIVE, NEGATIVE, OR ?;
? returns the current polarity
PASSCODE = ANY VALID PASSCODE.
and no valid digital signal is present at the
IGITAL
F
NALOG ALLBACK
Response
(valid passcode and argument)
INPUT: [ANALOG, DIGITAL] (for each
output)
(invalid passcode)
[no error message is issued]
control will determine whether the
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