<p dir="ltr">Hello..</p>
<p dir="ltr">Having read your post, I can see that you have eliminated the radio and associated cables.</p>
<p dir="ltr">I wonder if you tried not powering the hub?</p>
<p dir="ltr">Is your Beagle Bone supply using the barrel connector or the USB port? Sometimes I've found most if these supplies are terribly noisy. </p>
<p dir="ltr">Sam.</p>
<p dir="ltr"> </p>
<div class="gmail_quote">On Jan 1, 2015 10:44 AM, "Joel Jameson" <<a href="mailto:w0kgw3@gmail.com">w0kgw3@gmail.com</a>> wrote:<br type="attribution"><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr"><div><div><div><div>Have you matched the ohms for the output of the radio to the input of the URI ? Checked the audio levels with a deviation meter, and gone through the simple-usb setup?</div><br></div>If you've done all that already, you might need an isolation transformer (and/or opto-isolate on the control pins) from the URI/Fob to radio.<br><br></div>Cheers,<br></div>Joel<br>W0KGW<br></div><div class="gmail_extra"><br clear="all"><div><div><div dir="ltr">Cheers,<br>Joel<br>W0KGW<br></div></div></div>
<br><div class="gmail_quote">On Thu, Jan 1, 2015 at 1:42 AM, Randy Neals <span dir="ltr"><<a href="mailto:randy@neals.ca" target="_blank">randy@neals.ca</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><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="margin-top:0px;margin-right:0px;margin-left:18px;color:rgb(148,148,148);padding:0px;font-family:Arial,sans-serif;font-size:13px;line-height:19px;margin-bottom:0px!important"><li style="list-style:disc;word-wrap:break-word;margin:0px"><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;margin:0px"><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;margin:0px"><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;margin:0px"><span style="color:rgb(17,17,17)">Support auto switching between self-power and buspower mode</span></li></ul><br><br></div>
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