[arm-allstar] BBB URI USB-HUB Distorted Audio

[Sam Nabkey]

Hello..

Having read your post, I can see that you have eliminated the radio and
associated cables.

I wonder if you tried not powering the hub?

Is your Beagle Bone supply using the barrel connector or the USB port?
Sometimes I've found most if these  supplies are terribly noisy.

Sam.


On Jan 1, 2015 10:44 AM, "Joel Jameson" <w0kgw3 at gmail.com> wrote:

> Have you matched the ohms for the output of the radio to the input of the
> URI ? Checked the audio levels with a deviation meter, and gone through the
> simple-usb setup?
>
> If you've done all that already, you might need an isolation transformer
> (and/or opto-isolate on the control pins) from the URI/Fob to radio.
>
> Cheers,
> Joel
> W0KGW
>
> Cheers,
> Joel
> W0KGW
>
> On Thu, Jan 1, 2015 at 1:42 AM, Randy Neals <randy at neals.ca> wrote:
>
>>
>> I've been experiencing a distorted audio problem while setting up a BBB
>> with powered USB-HUB, DMK URI, and USB Keyboard.
>>
>> The audio distortion is noticeable on audio from the node. (transmit
>> audio)
>> To eliminate/isolate the issue I swapped out the URI for a SYBA USB Audio
>> FOB and PC speakers.
>> Still the same background hum/distortion. So that eliminated RF
>> interference, ground loops, the URI and the radio.
>>
>> Through further elimination, I have identified that when my USB keyboard
>> is connected to the USB HUB, the hum/distortion is louder. (URI through USB
>> HUB to BBB, no Keyboard)
>>
>> And then have compared the audio when not using a USB hub at all, and I
>> think there is a further improvement in audio, although not as major as
>> when the keyboard is /is-not connected.
>>
>> My next troubleshooting step is to swap out the keyboard, and then swap
>> out the USB HUB.
>>
>> The USB Hub I'm using is an AmazonBasics 4 Port USB 3.0 Hub with 5V/2.5A
>> power adapter
>>
>>    - Package includes: 1 USB 3.0 4 Port Hub / 1 5V/2.5A Power Adapter /
>>    1 built in 10 inch USB 3.0 cable / 1 Owner's Manual
>>    - Compatible with USB 3.0 and backwards compatible with USB 2.0
>>    - Support Low speed (1.5 Mbps)/ Full speed (12 Mbps)/High speed (480
>>    Mbps)/ Super speed (5 Gbps)
>>    - Support auto switching between self-power and buspower mode
>>
>>
>>
>>
>> _______________________________________________
>>
>> arm-allstar mailing list
>> arm-allstar at hamvoip.org
>> http://lists.hamvoip.org/cgi-bin/mailman/listinfo/arm-allstar
>>
>> Visit the BBB web page -
>> http://www.crompton.com/hamradio/BeagleBoneBlackAllstar/
>>
>
>
> _______________________________________________
>
> arm-allstar mailing list
> arm-allstar at hamvoip.org
> http://lists.hamvoip.org/cgi-bin/mailman/listinfo/arm-allstar
>
> Visit the BBB web page -
> http://www.crompton.com/hamradio/BeagleBoneBlackAllstar/
>
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