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Old 06-07-2018, 1:24 AM
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Default XTL-5000 Consolette 1800hz buzz

Hi everyone,

So, I've been trying to figure out this buzz in our 2 stations for a while now. Both radios emit a 1800hz buzz that is audible over the loudspeakers. Currently, the audio amplifiers receive their signals from FILT_AUD, pin 4, and AUD-SHLD, pin 2. Do we have these hooked up correctly? Or is there some setting I need to change on them for them to not make this annoying noise?
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Old 06-07-2018, 8:33 AM
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Here's one possibility... Certain base stations might be remotely controlled and typically use 2175 Hz and 1950 Hz tones for such remote control. If your consolette is controlled remotely, these tones might be getting into your audio feed and you would need to use a notch filter to remove them.

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Old 06-07-2018, 12:41 PM
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So, to troubleshoot this, should I remove the deskset circuit from the consolette connector to see if the deskset remotes are what's causing the interference?
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Old 06-07-2018, 11:27 PM
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So, I've tried removing the TRC circuit. Buzz is still ever-present on the Filtered Audio. So, a notch filter then. Anyone have a diagram for one?
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Old 06-08-2018, 1:24 AM
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Quote:
Originally Posted by SypherAK View Post
So, I've tried removing the TRC circuit. Buzz is still ever-present on the Filtered Audio. So, a notch filter then. Anyone have a diagram for one?
If you want to go old school, here is a page with design ideas.

https://www.electronics-tutorials.ws...op-filter.html

There are ways to use DSP systems, they will add a bit of delay to the audio pass through.

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Old 06-08-2018, 7:27 PM
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Quote:
Originally Posted by SypherAK View Post
So, I've tried removing the TRC circuit. Buzz is still ever-present on the Filtered Audio. So, a notch filter then. Anyone have a diagram for one?
What is and how is the Filtered Audio connected? You may have a ground loop. Is there any DC on the Audio line(s),
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Old 06-09-2018, 9:21 AM
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This actually brings up several questions. First, what kind of consolette are we talking about? Is it a digital or tone variant or are we talking about an XTL interfaced to a third party tone remote adapter? What is the console? MIP5000, MCC5500, MCC7500, Centracom or a third party console/remote?

If you are using a tone remote adapter, the filter may simply needs realignment.


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