[App_rpt-users] Loosing TX

[Doug Crompton]

When this happened to me before I solved the problem I think all I had to do was restart Allstar/Asterisk  -  /usr/local/sbin/astres.sh

I don't remember removing/reinstalling  the DMK. In fact when I did that I don't think it solved the problem.

You are implying that you think this is directly related to 75/40 meter operation???

If so proceed with RFI prevention!
73 Doug
WA3DSP
http://www.crompton.com/hamradio


Date: Mon, 10 Feb 2014 12:03:20 -0600
From: ars.w5omr at gmail.com
To: app_rpt-users at ohnosec.org
Subject: Re: [App_rpt-users] Loosing TX


  
    
  
  
    

    On 02/10/2014 08:34 PM, Doug Crompton
      wrote:

    
    
      
      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.   

      
    
    

    Agreed.  

    

    I am curious, though, what voltage is sent back to the USB buss from
    the device.

    My reasoning is, that in -my- case, when this happened, I noticed
    that if I pulled the USB cord, let it set for 15 or 20 seconds, then
    plugged it back in, the green light lit up, and as soon as it
    Transmitted, that URI died, again.  Shutting down the machine, to
    the point of letting the caps discharge, etc, then bringing
    everything back up, plugged in, all worked flawlessly...

    

    until, at least, I RF'ed the system again with HF signals from 75
    and/or 40m.... ~sigh~

    

    73 = Best Regards,

    -Geoff/W5OMR

    

  


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