Hi John, When you start to have the audio problems, try running the dahdi_test program from a bash prompt. Here are sample numbers from a Raspberry Pi 3B plus, with turbo mode enabled: [root@kb4fxc-portable asterisk]# dahdi_test -c 100 Opened pseudo dahdi interface, measuring accuracy... 99.992% 99.989% 99.996% 99.995% 99.996% 99.996% 99.993% 99.995% 99.994% 99.992% 99.995% 99.995% 99.995% 99.996% 99.993% 99.995% 99.995% 99.995% 99.993% 99.994% 99.994% 99.995% 99.994% 99.994% 99.994% 99.993% 99.994% 99.994% 99.994% 99.994% 99.994% 99.994% 99.994% 99.993% 99.994% 99.993% 99.995% 99.995% 99.995% 99.996% 99.995% 99.995% 99.995% 99.995% 99.995% 99.996% 99.995% 99.994% 99.995% 99.994% 99.995% 99.995% 99.995% 99.995% 99.995% 99.995% 99.996% 99.994% 99.995% 99.995% 99.995% 99.995% 99.995% 99.995% 99.995% 99.994% 99.995% 99.995% 99.995% 99.995% 99.996% 99.995% 99.995% 99.994% 99.995% 99.995% 99.995% 99.996% 99.995% 99.995% 99.995% 99.994% 99.995% 99.995% 99.995% 99.995% 99.996% 99.994% 99.995% 99.994% 99.995% 99.996% 99.994% 99.995% 99.995% 99.995% 99.995% 99.993% --- Results after 98 passes --- Best: 99.996% -- Worst: 99.989% -- Average: 99.994621% Cummulative Accuracy (not per pass): 99.995 73, David KB4FXC On Thu, 19 Apr 2018, John Locke wrote:

I am testing with 3 o 4 different PC models with the same problem, all new models... Some of them can run for 2 days without the problem, some get the audio chopped in just a few hours.

I'm using usbradio. Do you think that the simpleusb can work better?

I have no experience with simpleusb, and I'm willing to pay some consulting hours to solve this problem...

Some advice would be very appreciated Thanks in advance Best Regards John

On Tue, Apr 17, 2018 at 3:48 PM, Bob Pyke <k6ecm1@gmail.com> wrote:

...

From my experience, it’s not the URI; more likely an issue with the computer USB controller in the PC. ...Spent a bit of time finding that one.

Thanks, Bob K6ECM 73

On Apr 17, 2018, at 7:05 AM, John Locke <jldharma@gmail.com> wrote:

Hi, I have a very strange problem with DIAL + USB URIs. I get choppy audio after a couple of days or maybe several hours of constant use. Restarting asterisk or even the PC wont solve the problem. The problem only goes away if I connect the URI to another USB or shut down the PC for several hours. Maybe some temperature problem on the USB card??

I'm using a standard PC (i5 + 8GB) with 2 USB URIs. To test the problem I connected a tone generator to the URIs. These are some examples of the saved audio files in asterisk:

Normal <image.png>

After several hours <image.png>

<image.png>

<image.png>

after one day <image.png>

<image.png>

Some advice would be very appreciated Thanks in advance Best Regards John

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