[aprssig] D700A TNC Problems????

Tim Natho tnatho at sbcglobal.net
Fri Sep 14 23:34:06 CDT 2007


    Here is a link to the Kenwood download page . It is a great program to download and write to the TMD700A 


I hope this helps
Tim Natho

  ----- Original Message ----- 
  From: Ken H> 
  To: TAPR APRS Mailing List 
  Sent: Friday, September 14, 2007 8:36 PM
  Subject: Re: [aprssig] D700A TNC Problems????

  I just receive a bit of info about the TXD, can anyone confirm this info??  here it is for what it's worth:

  Re: [TMD700A] Re: TXDdelay 

  The Hyperterminal settings are only used / read / in force when using a
  computer and external program. As soon as you put the radio back into
  internal APRS mode all those settings are ignored and it goes back to 
  its hardcoded TXDelay setting. There is no way, computer or faceplate,
  to change the TXDelay setting used when you use the semi-unintelligent
  APRS built into the D700.

  Basically, if your local APRS environment requires you to change the 
  TXDelay, then you will have to find a way to install a computer on your
  motorbike, install an APRS program, and ignore the built-in APRS.

  After reviewing the documentation on Kenwood's web site, it does appear 
  that they fixed this "bug" in their new radio, the D710. It's faceplate
  menu system does allow limited changes to the TXDelay.


  On 9/14/07, Ken H> <sailingtoo at gmail.com > wrote: 
    Thanks for that tidbit of info Bill, but what does that mean for me?  Is there anything I can do?  Flat audio vs sloped audio?  Will putting more TXDelay help?

    Ken H>

    On 9/14/07, Bill Vodall WA7NWP <wa7nwp at gmail.com > wrote: 
      > My question it says the *unit of the parameter is 10 milliseconds - with a
      > default of 50....  is that *50 milliseconds?  OR 50 times 10 for a total of 
      > 500 milliseconds?  Half second seems like a long time for a default?

      It is a half second and it is a very long time.  Any equipment that
      requires a longer TXD then 500 ms should be tuned with a 12 gauge... 

      The D700 uses flat audio.  Most digi's probably use sloped audio with
      standard pre-emphasis.  Some times it will be enough "different" that
      the digi won't decode the D700.

      Bill - WA7NWP 

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