How to fix RFI, hum, clicks, or buzzes in Orban OPTIMOD-FM 8500 Music Equipment?
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doylecrystalAug 20, 2025
If you're experiencing RFI, hum, clicks, or buzzes, a grounding problem is likely. Review the grounding information. In unusual cases, repositioning the unit or its cables might reduce RF interference. A ground loop injecting noise into the exciter’s composite input can be resolved using the Orban CIT25 Composite Isolation Transformer. Also, using digital connections instead of analog ones can almost certainly eliminate the RFI.
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Michelle ReyesAug 22, 2025
What to do if I hear audible distortion on-air with Orban Music Equipment?
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Tamara WagnerAug 22, 2025
If you're hearing audible distortion, first verify that the source material at the 8500's audio inputs is clean. Ensure that the LESS-MORE control is not set beyond '9'. If you're using the 8500’s stereo enhancer, reduce the setting of the stereo enhancer’s RATIO LIMIT control. Also, if you are using an external processor ahead of the 8500, be sure it is not clipping or otherwise causing problems.
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Christopher GonzalesAug 25, 2025
Why are my on-air levels unexpectedly quiet with Orban OPTIMOD-FM 8500?
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Kimberly CortezAug 25, 2025
If your on-air levels are unexpectedly quiet, and you are using the ITU412 multiplex power controller and have edited a factory preset, you may have to readjust the MULTIPLEX POWER OFFSET control, as the ITU412 multiplex power controller may have been turned on accidentally.
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Isaac WilliamsAug 26, 2025
What causes poor peak modulation control/low on-air loudness in Orban OPTIMOD-FM 8500 Music Equipment?
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Bryce MyersAug 27, 2025
Poor peak modulation control or low on-air loudness can be caused by a signal path following the 8500 with poor transient response. Even the FM exciter can have insufficient flatness of response and phase-linearity (particularly at low frequencies) to disturb peak levels. If you're using a link with 32 kHz sample rate to pass the 8500’s output, place the 8500 at the transmitter and using the STL it to pass the unprocessed audio to the 8500’s input(s).
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Michael WillisAug 27, 2025
How to reduce audible noise on air with Orban OPTIMOD-FM 8500?
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Jessica LittleAug 28, 2025
To reduce audible noise on air, use the compressor gate to freeze the gain of the AGC and compressor systems whenever the input noise drops below a level, as excessive compression will always exaggerate noise in the source material. Also, drive the 8500 with professional levels (more than 0 dBu reference level), since the overall noise performance of the system is usually limited by the overload-to-noise ratio of the analog-to-digital converter used by the 8500.
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Gail HughesAug 29, 2025
What to do if I hear a whistle on air, perhaps only in stereo reception, using Orban OPTIMOD-FM 8500?
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Charles BrightAug 29, 2025
If you hear a whistle on air, especially in stereo reception, check the analog or digital outputs with a spectrum analyzer, as this could be due to oscillation in the analog input or output circuitry.
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Sean WebsterAug 31, 2025
What causes loudness to drop momentarily during HD Radio analog/digital crossfades in Orban?
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Brian JacksonAug 31, 2025
If the loudness drops momentarily during HD Radio analog/digital crossfades, it may be because the analog and digital channels in your transmission path have reversed polarity with respect to each other. You can correct this with the HD POLARITY or FM POLARITY controls.
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Kristina MillerSep 2, 2025
Why won't my Orban OPTIMOD-FM 8500 system pass line-up tones at 100% modulation?
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Mrs. Laura MezaSep 2, 2025
This is normal. The 8500 can generate test tones itself.
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Aaron RobertsSep 4, 2025
Why won't my Orban Music Equipment system pass Emergency Alert System (“EAS” USA Standard) tones at the legally required modulation level?
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eddiemartinSep 4, 2025
This is the same issue as with line-up tones. These tones should be injected into the transmitter after the 8500.
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Shelley SloanSep 6, 2025
What to do if the system receiving Orban 8500’s digital output will not lock?
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Ryan SchmidtSep 6, 2025
Be sure that the 8500’s output sample rate is set match the sample rate that the driven system expects.
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