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Voice/Control Channel Decoding Software - For discussion of software applications which decode digital voice formats and trunking control channels. Please use the HF Digital Signals forum for anything below 30MHz.

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Old 06-12-2018, 12:21 PM
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Default Dispatch tone not on DSD

Got a weird one here...

There's a new CapMax system here and when the FD dispatches the calls, the call tone is not heard on DSD while it is heard on the radios (of course) and a Uniden scanner. I don't even see any activity on the CC during the call tone. Just after, when the dispatcher speaks, I see the call on the CC. Any ideas why?
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Old 06-12-2018, 1:39 PM
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Hello,

The mbelib vocoder library used in DSD does not implement tones.

73 Eric
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Old 06-12-2018, 7:27 PM
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Should use DSD+ instead. It handles tones.
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Old 06-13-2018, 11:20 AM
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I use DSD+ FL, what am I doing wrong?
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Old 06-13-2018, 4:15 PM
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Hm, that's what I use and I've heard it handling alert tones on a DMR system.


Your description suggests that there is something happening on the control channel that DSD+ isn't decoding properly. That would explain why it doesn't tune to a traffic channel and decode the tones.


Your best bet would be to record the raw CC audio during one of these dispatches and send it to the fastlane address, then they can figure out what's what.
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Old 06-13-2018, 7:30 PM
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I'll try to do that.
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