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

Fri Jan 2 10:00:35 EST 2015

Still sounds like a ground loop to me! ...And, it'll probably be back.

On Fri, 2 Jan 2015, Doug Crompton wrote:

> Randy,
> 
>   Glad to hear you solved the problem. I can't see how the keyboard 
wired or unwired would have caused analog distortion though. Perhpas it 
was a digital problem. In any event as was mentioned you do not need a 
keyboard or monitor to run or to setup BBB Allstar. No one that I know 
runs it that way. You ssh in using putty from another computer and log in.
> 73 Doug
> WA3DSP
> http://www.crompton.com/hamradio
> 
> 
> Date: Fri, 2 Jan 2015 06:22:32 -0500
> From: randy at neals.ca
> To: arm-allstar at hamvoip.org
> Subject: Re: [arm-allstar] BBB URI USB-HUB Distorted Audio
> 
> 
> 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 Doug
> WA3DSP
> 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
> 

> 

> 

                  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

> 

> 

> 
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> 
            _______________________________________________
> 

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> 
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> 
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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
> 

> 

> 

> 
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> 

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> 
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> 
> 

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