<div dir="ltr"><br>Hi all,<br><br>The sound is like a hum and at higher audio levels makes the audio distorted.<br>The USB keyboard seems to be the culprit.<br>Tried the USB hub powered and not-powered, did not make a difference.<br><br>Now that I have the node setup, I won't need the keyboard - so will leave it unplugged.<br>I'll get a different brand keyboard and see if that makes a difference.<br><br>Anyway, node 28701 is now on the air - VE3PBO.<br><br>thanks,<div>Randy<br><br></div></div><div class="gmail_extra"><br><div class="gmail_quote">On Thu, Jan 1, 2015 at 2:56 PM, Doug Crompton <span dir="ltr"><<a href="mailto:doug@crompton.com" target="_blank">doug@crompton.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div><div dir="ltr"><font color="#000000" face="Tahoma,sans-serif">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.<br><br>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. <br></font><span class=""><br><b><font style="font-size:16pt" size="4">73 Doug</font><font style="font-size:16pt" size="4"><br></font><font style="font-size:16pt" size="4">WA3DSP</font><font style="font-size:16pt" size="4"><br></font><font style="font-size:16pt" size="4"><a href="http://www.crompton.com/hamradio" target="_blank">http://www.crompton.com/hamradio</a></font></b><font style="font-size:16pt" size="4"><br></font><br><br></span><div><hr>Date: Thu, 1 Jan 2015 14:02:56 -0500<br>From: <a href="mailto:kp4tr.ramon@gmail.com" target="_blank">kp4tr.ramon@gmail.com</a><br>To: <a href="mailto:arm-allstar@hamvoip.org" target="_blank">arm-allstar@hamvoip.org</a><br>Subject: Re: [arm-allstar] BBB URI USB-HUB Distorted Audio<div><div class="h5"><br><br>
<div>To add to this, the problem may be
using a USB hub itself for power and a low quality one.<br>
<br>
1. Use a quality 2 amp 5V power source. Not a USB phone charger
type.<br>
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.<br>
3. Don't connect a monitor to it either.<br>
<br>
In short, just use the USB port for the sound card/FOB. And don't
use a USB hub at all.<br>
<br>
73!<br>
<br>
<br>
<br>
On 1/1/2015 1:33 PM, Robert Pantazes wrote:<br>
</div>
<blockquote>
<div dir="ltr">
<div style="font-family:arial black,sans-serif;font-size:large">Doug,<br>
</div>
<div style="font-family:arial black,sans-serif;font-size:large">Sounds like 60 Hz is on the
audio.<br>
</div>
<div style="font-family:arial black,sans-serif;font-size:large">Bob, W2ARP<br>
<br>
</div>
</div>
<div><br>
<div>On Thu, Jan 1, 2015 at 12:38 PM, Doug
Crompton <span dir="ltr"><<a href="mailto:doug@crompton.com" target="_blank">doug@crompton.com</a>></span>
wrote:<br>
<blockquote style="border-left:1px #ccc solid;padding-left:1ex">
<div>
<div dir="ltr"><font color="#000000" face="Tahoma,sans-serif">Randy,<br>
<br>
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...<br>
<br>
Are you using 1.2.1 code? Have you changed the startup
delay time which defaults to 30 seconds?<br>
<br>
If this is just hum what frequency is it? 60 cycles,
120 cycles or higher?<br>
<br>
Is it happening in both directions TX and RX?<br>
<br>
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.<br>
</font><br>
<font face="Tahoma,sans-serif">Happy New Year!</font><br>
<br>
<b><font style="font-size:16pt" size="4">73 Doug</font><font style="font-size:16pt" size="4"><br>
</font><font style="font-size:16pt" size="4">WA3DSP</font><font style="font-size:16pt" size="4"><br>
</font><font style="font-size:16pt" size="4"><a href="http://www.crompton.com/hamradio" target="_blank">http://www.crompton.com/hamradio</a></font></b><font style="font-size:16pt" size="4"><br>
</font><br>
<br>
<div>
<hr>Date: Thu, 1 Jan 2015 02:42:25 -0500<br>
From: <a href="mailto:randy@neals.ca" target="_blank">randy@neals.ca</a><br>
To: <a href="mailto:arm-allstar@hamvoip.org" target="_blank">arm-allstar@hamvoip.org</a><br>
Subject: [arm-allstar] BBB URI USB-HUB Distorted Audio<br>
<br>
<div dir="ltr"><br>
I've been experiencing a distorted audio problem
while setting up a BBB with powered USB-HUB, DMK
URI, and USB Keyboard.<br>
<br>
The audio distortion is noticeable on audio from the
node. (transmit audio)<br>
To eliminate/isolate the issue I swapped out the URI
for a SYBA USB Audio FOB and PC speakers.<br>
Still the same background hum/distortion. So that
eliminated RF interference, ground loops, the URI
and the radio.<br>
<br>
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)<br>
<br>
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.<br>
<br>
My next troubleshooting step is to swap out the
keyboard, and then swap out the USB HUB.<br>
<br>
The USB Hub I'm using is an AmazonBasics 4 Port USB
3.0 Hub with 5V/2.5A power adapter
<ul style="color:rgb(148,148,148);padding:0px;font-family:Arial,sans-serif;font-size:13px;line-height:19px">
<li style="list-style:disc;word-wrap:break-word"><span style="color:rgb(17,17,17)">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</span></li>
<li style="list-style:disc;word-wrap:break-word"><span style="color:rgb(17,17,17)">Compatible with
USB 3.0 and backwards compatible with USB 2.0</span></li>
<li style="list-style:disc;word-wrap:break-word"><span style="color:rgb(17,17,17)">Support Low speed
(1.5 Mbps)/ Full speed (12 Mbps)/High speed
(480 Mbps)/ Super speed (5 Gbps)</span></li>
<li style="list-style:disc;word-wrap:break-word"><span style="color:rgb(17,17,17)">Support auto
switching between self-power and buspower mode</span></li>
</ul>
<br>
<br>
</div>
<br>
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</blockquote>
</div>
<br>
<br clear="all">
<br>
-- <br>
<div>
<div dir="ltr">
<div>
<div>
<div>de Bob, W2ARP<br>
-<br>
A. Robert Pantazes, W2ARP<br>
</div>
11244 Sparkleberry Drive<br>
</div>
Fort Myers, FL 33913<br>
</div>
USA<br>
<div>
<div>
<div><br>
</div>
</div>
</div>
</div>
</div>
</div>
<br>
<fieldset></fieldset>
<br>
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</blockquote>
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