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[aprssig] Configuration on a TNC-X digi

Vince rradiohham1 at earthlink.net
Mon Oct 10 16:40:08 UTC 2005


I hope someone out on the list here can help me with setting the configuration on a TNC-X by Coastal Chip Works that I have just put together, it has the X-Digi daughter Board, so it can be set up as a digipeater.
This TNC just runs in the KISS mode. The X-Digi is a new item with the TNC-X. I had contacted John, the person that I purchased it from, but he was only able to give me limited help, he suggested to maybe contact the list here. I have never set up a digi station before, but have worked with my KAM TNC over the years, so I do have some understanding of the necessary setting in a TNC, and seen the setting for the newer KAM TNC, but mine are the older ones that do not support the newer setting.

I would like to set it up as a fill-in digpeater for events where the regular digipeaters in the area are not able to cover.

Here are the settings it is looking for.

  DigiPeater Configuration Menu                                      

C.     Set Digipeater Callsign.         :K6BIR-9                                                
A.     Set Digipeater Alias.            :URDIGI                                               
F.     Set UIFlood Callsign.            :CA                                         
L.     Set UIFlood Limit.               :7                                          
T.     Set UITrace Callsign.            :WIDE                                             
M.     Set UITrace Limit.               :4                                          
1.     Set UICall 1.                    :                                         
2.     Set UICall 2.                    :                                         
3.     Set UICall 3.                    :                                         
4.     Set UICall 4.                    :                                         
5.     Set UICall 5.                    :                                         
6.     Set UICall 6.                    :                                         
7.     Set UICall 7.                    :                                         
8.     Set UICall 8.                    :                                         

D.     Set Dupe Time (x5 secs).         :6                                          

B.     Set Beacons.  

These are the instructions that came with TNC-X

Choose the item you wish to reconfigure by pressing the letter or number in the left hand column.  The Callsign and Alias are fairly straightforward, but some of the other parameters may require explanation.  

The UIFlood callsign supports the WIDEn-N paradigm.  When the digi receives a packet with a path of, say WIDE3-3, it will decrement the SSID value (to WIDE3-2) and retransmit the packet.  When it reaches WIDE3-0, it will replace this value with the X-Digi's callsign.  

UITrace works in a similar manner, but adds X-Digi's callsign to the path.  So, for example, WIDE3-3 becomes URCALL, WIDE3-2 in the above example.  The limits for UIFlood and UITrace are provided to allow the X-Digi to stop overly long paths.  In the above case the UITrace limit is set to 3, so an incoming path of WIDE4-4, for example, would be simply  be digipeated as URCALL.  The UICall fields allow you to specify up to 8 calls for which X-Digi will simply do callsign substitution.  For example, if Duplicates are calculated based on a CRC that is applied to the entire packet except for the path.  So if X-Digi sees a packet with the same source and destination address and the same contents within the time period specified by dupetime, it will not diigipeat it.  Because this timer is set in increments of 5 seconds, a value of 6, for example, will result in a 30 second duplicate checking period.  Do not set this value higher than about 24 (2 minutes).  Setting the dupe value to 0 turns off dupe checking.

Selecting the B value from the menu brings up another menu that allows you to set up the beacons.  X-Digi supports 4 different beacons, each of which can be sent at a different interval, have a different path, and have a different text.  To set up these beacons, hit the B key.  The time values here are in increments of 5 seconds, so to set a beacon to transmit every 10 minutes, for example, you would use a value of 120.  The offset value allows you to specify a time period to elapse before the first beacon is sent.  For example, if you set Beacon 1 to be sent every 5 minutes and Beacon 2 to be sent every 10 minutes, every other time you would have both beacons sent at the same time.  While this will work, you might prefer to have X-Digi wait a minute or two before sending the first beacon so that the two beacons would never be sent at the you wanted to support RELAY (not currently recommended) you could do so by adding this value in UICALL.  Packets with a path of RELAY would be digipeated with a path of URCALL.

The menu also allows you to specify a dupe time value in 5 second intervals.  same time.  

Thanks for any help that the list may provide,
Vince, K6BIR                 


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