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

[Ramon Gonzalez]

Avoid the keyboard. Avoid the monitor on the HDMI. For Allstar and the BBB
it is undesired. Ground loops, power drain, and clutter is  all you will
have! Use ssh and/or putty!

On Friday, January 2, 2015, Randy Neals <randy at neals.ca> wrote:

>
> 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
> <javascript:_e(%7B%7D,'cvml','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
>> <javascript:_e(%7B%7D,'cvml','kp4tr.ramon at gmail.com');>
>> To: arm-allstar at hamvoip.org
>> <javascript:_e(%7B%7D,'cvml','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
>> <javascript:_e(%7B%7D,'cvml','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 <javascript:_e(%7B%7D,'cvml','randy at neals.ca');>
>> To: arm-allstar at hamvoip.org
>> <javascript:_e(%7B%7D,'cvml','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
>> <javascript:_e(%7B%7D,'cvml','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
>> <javascript:_e(%7B%7D,'cvml','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
>>
>>
>>
>> _______________________________________________
>>
>> arm-allstar mailing listarm-allstar at hamvoip.org <javascript:_e(%7B%7D,'cvml','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
>> <javascript:_e(%7B%7D,'cvml','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
>> <javascript:_e(%7B%7D,'cvml','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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