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

[Robert Pantazes]

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 DougWA3DSPhttp://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
> 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
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.hamvoip.org/pipermail/arm-allstar/attachments/20150101/d4a46198/attachment.html>