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

[Randy Neals]

Hi all,

The sound is like a hum and at higher audio levels makes the audio
distorted.
The USB keyboard seems to be the culprit.
Tried the USB hub powered and not-powered, did not make a difference.

Now that I have the node setup, I won't need the keyboard - so will leave
it unplugged.
I'll get a different brand keyboard and see if that makes a difference.

Anyway, node 28701 is now on the air - VE3PBO.

thanks,
Randy


On Thu, Jan 1, 2015 at 2:56 PM, Doug Crompton <doug at crompton.com> wrote:

> There is probably no reason to power a powered USB hub. I run the Belkin 4
> port with DMK URI, Wireless FOB, USB memory stick, and USB to serial
> converter without powering it.
>
> The only touchy one would be the wireless fob which can draw more current
> but most other things you would connect will work fine without power.
>
>
>
> *73 DougWA3DSPhttp://www.crompton.com/hamradio
> <http://www.crompton.com/hamradio>*
>
>
> ------------------------------
> Date: Thu, 1 Jan 2015 14:02:56 -0500
> From: kp4tr.ramon at gmail.com
> To: arm-allstar at hamvoip.org
> Subject: Re: [arm-allstar] BBB URI USB-HUB Distorted Audio
>
>
> To add to this, the problem may be using a USB hub itself for power and a
> low quality one.
>
> 1. Use a quality 2 amp 5V power source. Not a USB phone charger type.
> 2. Don't connect a keyboard to the BBB. There's no need for it. Use ssh to
> administer your node from another computer on your network.
> 3. Don't connect a monitor to it either.
>
> In short, just use the USB port for the sound card/FOB. And don't use a
> USB hub at all.
>
> 73!
>
>
>
> On 1/1/2015 1:33 PM, Robert Pantazes wrote:
>
>  Doug,
>  Sounds like 60 Hz is on the audio.
>  Bob, W2ARP
>
>
> On Thu, Jan 1, 2015 at 12:38 PM, Doug Crompton <doug at crompton.com> wrote:
>
>  Randy,
>
>   I guess my first question is it truly hum or distortion? You said
> distortion and I think what you need to nail down is it a digital or analog
> problem.  Some questions...
>
> Are you using 1.2.1 code? Have you changed the startup delay time which
> defaults to 30 seconds?
>
> If this is just hum what frequency is it? 60 cycles, 120 cycles or higher?
>
> Is it happening in both directions TX and RX?
>
> A lot of people use the DMK and cheap USB fobs and this is the first I
> have heard of any analog problems especially when there is not readio
> connected and no potential ground loops.
>
> Happy New Year!
>
>
>
> *73 Doug WA3DSP http://www.crompton.com/hamradio
> <http://www.crompton.com/hamradio>*
>
>
>  ------------------------------
> Date: Thu, 1 Jan 2015 02:42:25 -0500
> From: randy at neals.ca
> To: arm-allstar at hamvoip.org
> Subject: [arm-allstar] BBB URI USB-HUB Distorted Audio
>
>
> 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
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>
> Visit the BBB web page -
> http://www.crompton.com/hamradio/BeagleBoneBlackAllstar/
>
>
>
>
> --
>   de Bob, W2ARP
> -
> A. Robert Pantazes, W2ARP
>  11244 Sparkleberry Drive
>  Fort Myers, FL 33913
>  USA
>
>
>
> _______________________________________________
>
> arm-allstar mailing listarm-allstar at hamvoip.orghttp://lists.hamvoip.org/cgi-bin/mailman/listinfo/arm-allstar
>
> Visit the BBB web page - http://www.crompton.com/hamradio/BeagleBoneBlackAllstar/
>
>
>
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> 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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