[App_rpt-users] Loosing TX

Tue Feb 11 02:34:04 UTC 2014

Another thing to consider on the DMK is RFI. They are very susceptible to it especially higher power HF but be aware that any RF could cause problems. I have had this happen at two different locations. The fix was ferrites on the leads in and out. One on each lead worked for me but more may be necessary depending on the severity. You can also wrap multiple turns through a single ferrite if they fit. 

This shows up a a locked interface and usb error messages that in my case specifically said EMI? It might not always catch that it is an EMI problem though so other errors might indicate the same thing.

Since the DMK is nothing more than a fancy USB sound FOB I suspect any FOB might have this problem. Lead length both audio and USB would also be a factor.   
73 Doug
WA3DSP
http://www.crompton.com/hamradio

Date: Mon, 10 Feb 2014 15:39:43 -0600
From: bob at w5evh.org
To: mike at midnighteng.com; app_rpt-users at ohnosec.org
Subject: Re: [App_rpt-users] Loosing TX

Hello Mike,

This is good information.  I looked at dmesg and saw there are 3 USB HUBs (6 ports total: 2 on the side, 3 on the back and 1 internal).  I am using the Asus Eee All In One machines.  I got a bunch of them free because the touchscreen went out.  These were pulls as old POSs (Point of Sale, not the other POS)  lol   These machines are great onsite for me because I dont need anything extra other than a USB KB.  I have the two URIs on the back of the machine and seems to be on the same hub.  I will make it out to the site and move one to the side and check it is on another hub.  Hopefully this will solve my TX problem.

Thanks for the input.

boB - W5EVH

On Mon, Feb 10, 2014 at 1:42 PM,  <mike at midnighteng.com> wrote:

>From my own experience, (i have a bunch of hardware experience)

I would say the best place to look first is the PNP interrupt assignment even though you can't force PNP to shuffle IRQ's on most boards anymore you can eliminate unused built in hardware to alleviate the stress.

Mainly some other hardware in your system is sharing a IRQ with the USB HUB and intercepting info that was not intended for it.If using a machine with PS2 style mouse, unplug the mouse.

Some other things to try is to NOT plug more than one USB FOB (or any USB device) into a single USB HUB.This may confuse you a bit but if you have 6 USB ports built in than you have 3 USB HUBS normally each HUB is 2 ports.

If all fails, reset the bios to factory, "reboot", set bios again without unneeded hardware (ie serial, parallel and unused USB when possible), "reboot machine again" and see where you are. Don't forget to save settings each time.

Sharing IRQ's in a system was not a bad idea but it only takes one piece of hardware to not comply correctly to screw things up.
It is always a benefit to check the hardware before tweeking any software.

Let me know if you get anywhere on this.

...mike/kb8jnm

-------- Original Message --------

Subject: Re: [App_rpt-users] Loosing TX

From: Bob Roszkowski <bob at w5evh.org>

Date: Mon, February 10, 2014 2:20 pm

To: Michael Hebert <mhebert1975 at gmail.com>, app_rpt mailing list

<app_rpt-users at ohnosec.org>

Hi Michael,

Thanks for the information to test the URI.  It does not seem the URI is the issue.  I have swapped the URIs with new ones and they all did the same thing.

I believe this issue is with the PC hardware or software.  Might be a USB bus problem.  I will look further into it.

boB - W5EVH

On Fri, Feb 7, 2014 at 7:45 PM, Michael Hebert <mhebert1975 at gmail.com> wrote:

 You can try the uridiag  program.
 Q: How can I test my URI? 
A: Download the uridiag program located at http://svn.ohnosec.org/viewvc/projects/allstar/uridiag/trunk/?root=svn&view=tar 
 Un-tar it and then ‘make’ it. Run ./uridiag and select option C. That will tell you how to make a loop-back connector for running the diagnostics. This is the same program we use to test each 
 URI before it leaves the factory.  Q: How can I make a loop-back cable to test my URI? 
 A: Get a male DB-25 connector such as L717SDB25P from www.digikey.com . Then wire up  the following connections: 
Pin 1 to Pin 7 Pin 2 to Pin 3  Pin 4 to Pin 8 Pin 23 to Pin 24 
10K Resistor between Pins 21 and 22  10K Resistor between Pins 21 and 23 For URIx (CM119) only, also include the following connections: 
 Pin 5 to Pin 10 Pin 6 to Pin 11 

On Fri, Feb 7, 2014 at 3:22 PM, Bob Roszkowski <bob at w5evh.org> wrote:

Group,

I have a site that is acting strange.  I have a server with a VHF(Mastr II) and UHF(TKR-850) repeater, each with a URI.  Both repeaters are linked together locally.  I noticed while someone is using the machine, the TX will just stop while they are talking.  If I switch to the other repeater, the TX is working fine.  The URIs Red LED goes out.  This happens to both machines.   I have swapped and changed URIs and cables with no change.  Any ideas? 

boB - W5EVH

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