Orban OPTIMOD-FM 8500S, Operating Manual

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5-6
TROUBLESHOOTING ORBAN MODEL
System Will Not Pass Emergency Alert System (“EAS” USA Standard) Tones at the
Legally Required Modulation Level
See System Will Not Pass Line-Up Tones at 100% Modulation (directly above) for an
explanation. These tones should be injected into the transmitter after the 8500S, or
the 8500S should be temporarily switched to
BYPASS
to pass the tones.
System Receiving 8500S’s Digital Output Will Not Lock
Be sure that the 8500S’s output sample rate is set match the sample rate that the
driven system expects. Be sure that the 8500S’s output FORMAT (AES3 or SPDIF) is set
to match the standard expected by the driven system.
You See A “Communications Board Error” Message
This can be caused by applying an AES3, AES3id, AES11, or AES11id to the
10 MHz/wordclock input. Use one of the AES3 inputs for AES3 sync sources.
19 kHz Frequency Out-of-Tolerance
First, verify that a problem really exists by using a second frequency-measuring de-
vice and/or verifying the problem with a monitoring service. If the problem is real,
contact Orban Customer Service for a crystal replacement; there is no frequency trim
available.
L–R (Stereo Difference Channel) Will Not Null With Monophonic Input
This problem is often caused by relative phase shifts between the left and right
channels prior to the 8500S’s input. This will cause innocuous linear crosstalk be-
tween the stereo main and subchannels. Such crosstalk does not cause subjective
quality problems unless it is very severe.
Audio Mute Occurs When Switching Between UL and Non-UL Presets
This is normal. It occurs because the DSP code must be reloaded.
Talent Complains About Delay in Their Headphones
Dedicate an output to low-delay Monitor mode and use this to drive headphones.
See
Monitoring on Loudspeakers and Headphones on page 1- 25 , and step (B) on
page 2-30. Alternatively, use an Ultra-Low-Latency (UL) preset. See Ultra-Low-
Latency Five-Band on page 3-19.
HD Output Sounds Too Bright
Enable adjustment of the HD output’s spectral balance by putting the on-air preset
into
I
NDEPENDENT
mode. Do this by setting the FM
Æ
HD C
ONTROL
C
OUPLING
control in
the
HD L
IMITING
page of
A
DVANCED
C
ONTROL
to
I
NDEPENDENT
. You can also toggle this
control via two buttons on the button bar in 8500S PC Remote. See page 3-64.
In this mode, the HD processing channel’s equalizer, five-band compressor, and
band-mix controls are independent of the corresponding controls in the FM channel
and can be adjusted separately. You can therefore fine-tune high frequencies by ad-
justing the equalizer, parameters in the band 4 and band 5 compressors, the band 4
and band 5
B
AND
M
IX
controls, and the
HD D
E
-
ESS
control. One of the most effective
ways to tame harsh high frequencies dynamically is to activate the HD channel’s
band 5 compressor. See
HD Audio Controls on page 3-70.