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Streaming / Broadcasting / Audio Recording - Interested in putting your scanner online for others to hear? Want to listen to other radios on the internet. This forum is here for you to discuss these topics related to streaming scanners online.

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Old 01-12-2018, 10:54 AM
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Default optimizing audio quality of my feed

Hi,

If this post is not appropriate in this forum section, feel free to move or delete.

I just yesterday got my first feed up and running. I'm using DarkIce on a Raspi with a conventional analog scanner (BCT8) with an audio cable into a USB sound card. Listening to the scanner audio directly, when there's no over air audio, (I've adjusted squelch) it's perfectly silent.

However over my feed I hear a faint, but steady popping or beating noise. I've messed with alsa input levels but that doesn't seem to matter.

Is this a noise issue between my scanner and USB soundcard, a software issue or something else?

Here's the feed in question.
https://www.broadcastify.com/listen/feed/27342

Thanks
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Old 01-12-2018, 12:16 PM
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I have a sound on a feed and the popping sound is almost perfectly timed to the blinking light on the wifi / or network link light .
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Old 01-12-2018, 1:02 PM
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I'm using an external USB sound card with blinking LED. Maybe I should introduce a USB extension cable with ferrite beads. I found this helpful when I was playing with SDR dongles. Getting the receiver further from the laptop...
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Old 01-12-2018, 1:32 PM
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I ordered this noise eliminator and it has virtually eliminated any background noise on my feed. https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1
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Old 01-12-2018, 8:00 PM
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I had one of those $5 USB adapters from Amazon to use on my feed and while it did work, it put a lot of noise in the audio. I tried this and it fixed all of my noise problems:

https://www.amazon.com/Behringer-UCA202-BEHRINGER-U-CONTROL/dp/B000KW2YEI

I run it on a Windows-based thin client, but people have been using it with Linux for years.
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Old 01-12-2018, 9:12 PM
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Not sure if the Pi will run this... but I've used the Orban Loudness Meter for years with great results: https://www.orban.com/free-orban-loudness-meter/

Set the output level of your scanner maybe 20% below the point where it overdrives the sound card input, and lower the input level so the signal goes no higher than -3 dbFS on the PPM scale (read the Readme on the Orban website). That should give you the best S/N ratio.

Then, after a period of activity on your feed, download an archive mp3 file and look at it with Audiacity... you should see the waveform peaking at about 90% full scale.

This has worked great for my feed: Quad 3 and Lake Zurich Fire

Hope that helps...

Quote:
Originally Posted by gargamello View Post
I've messed with alsa input levels but that doesn't seem to matter.
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