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

[(KP4TR)Ramon Gonzalez]

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 
> <mailto: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*
>
>
>     ------------------------------------------------------------------------
>     Date: Thu, 1 Jan 2015 02:42:25 -0500
>     From: randy at neals.ca <mailto:randy at neals.ca>
>     To: arm-allstar at hamvoip.org <mailto: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
>     <mailto: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 <mailto: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/
>
>
>
>
> -- 
> de Bob, W2ARP
> -
> A. Robert Pantazes, W2ARP
> 11244 Sparkleberry Drive
> Fort Myers, FL 33913
> USA
>
>
>
> _______________________________________________
>
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>
> Visit the BBB web page - http://www.crompton.com/hamradio/BeagleBoneBlackAllstar/

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