This page last updated 04/23/2012
Here are some files to help you with setting up your TNC and radio to work as an APRS digipeater. If you have any questions on the set up your TNC, please contact Mark N9MEA at n9mea[at]wisconsinaprs[dot]net.
You can also check out Bob Bruninga WB4APR's APRS webpage for more information.
Note from Mark N9MEA: I don't agree with backing down the TX delay (TXD in some TNCs) below 300mSec. I've seen problems with some radios cutting off the beginning of the APRS packets causing the packet to become unusable. My suggestion is to stick with the 300mSec delay and if you are using older radios that may have antenna relays you may want to consider turning up the delay to 400mSec.
Here is the format you should be using to send out Echolink, IRLP, WIRES and Winlink 2000 objects.
Here is the format you should be using to send out Repeater objects.
Kantronics KPC3+ version 8.3 and 9.1 - text file
Kantronics KPC3+ version 8.3 and 9.1 with object beacons - text file
Kantronics KPC3 version 8.2 - text file
Kantronics KPC3 version 8.2 with object beacons - text file
Here is the pin out of the radio connection to the KPC3 and KPC3+
Kantronics KAM, KPC1, KPC2, KPC4, KPC2400 Commands Manual for version 3 firmware
Kantronics KAM, KPC1, KPC2, KPC4, KPC2400 Install Manual
Kantronics KPC3, KPC3+ firmware version 8.2 manual addendum
Kantronics KPC2 interference - I have seen this TNC cause the receiver of the radio to unsquelch. I've seen it happen on 145.610 and 145.030. This is caused by the crystal for the microprocessor. You can shift the frequency of the crystal by changing C31 and C32. On my units the factory value was 25pf. I tried changing the capacitors to 22pf and the interference was the same on 145.610 and got worse on 145.030. I didn't have any higher value capacitors so I added a 10pf capacitor in parallel with the 22pf capacitors and that shifted the interference up high enough that I didn't have it any more on 145.610 or 145.030. I've been told that the KPC3 (not the plus) has the same problem. The capacitors to change in this TNC are C10 and C12. I would start with 30pf and see how that works.
I find that it is easier to use Pacterm when programming the Kantronics because it has a separate command line to enter in the commands and functions.
Pac-Comm Tiny2 - text file
MFJ/Vectronics - Requires
burning a new firmware chip using UIDigi
1270 series/ 1274/ some 1278 - Fill-In Digipeater - text file
1270 series/ 1274/ some 1278 - Fill-In Digipeater with object beacon - text file
1270 series/ 1274/ some 1278 - W2 max Digipeater - text file
1270 series/ 1274/ some 1278 - W2 max Digipeater with object beacon - text file
1270 series/ 1274/ some 1278 - W3 max Digipeater - text file
1270 series/ 1274/ some 1278 - W3 max Digipeater with object beacon - text file
Link to Tim Cunningham's (N8DEU) UIDIGI programming page
Original manual for the MFJ1270B TNC - 1270B Manual
Original manual for the MFJ1270C TNC - 1270C Manual
If this TNC is to be used as a stand along digipeater, it will only work as a WIDE1-1 fill-in digi. If it is to be used as a regular full feature APRS digi, it must be controlled by a computer running the correct software such as UI-View.
PK232 MBX Manual
UI-View Digipeater Settings
Setup instructions for both a full digipeater and a WIDE1-1 fill-in digi - pdf file - link
Just a couple of notes about using this set up. First, increase the DUPE_SUPPRESS_SECONDS to 35 from 30. UIFLOOD for Wisconsin should be WI, so it should read UIFLOOD=WI. When entering in the alias information (or sub alias), your call needs to include any SSID that you may be using.
In the Station setup-Beacon comment, use PHG if you want, it isn't necessary. Also, for Wisconsin, the rest should read Wn, WIn and then the city or town. The big thing in the Station set up is to enter the correct station icon and overlay. Use the "S" for a full digipeater and a "1" for a Wide1-1 fill-in digi. Before you can edit the text file for the full digipeater, you must enable digi and UI Only in the Digipeater setup.
Open Tracker 2 - This TNC uses the same pin out on the radio connector as the Kantronics KPC3 series. We have the pin out listed below. Here is a sample file of a working digi (N9MEA-6 in Adams/Friendship). Do a right click on the link to the file and do a save as and then save it where ever you save your OT2 files. If you are using this file, be sure to have the OT2 software and be sure to change the call and position text for your site.
Argent and GE/Ericsson MDX radio - We have this TNC on the GE MDX radio at many sites. There is a small modification that we do to the TNC because the radio needs more transmit audio and that is to remove R3 (30K resistor) and replace it with a jumper wire and then install the "HI" jumper. If you remove the "HI" jumper, you can hook the TNC to a standard ham radio and not have too much audio driving the mic circuit.
Check this page out if you are trying to send out objects on your Open Tracker 2.
Tiny Trak 4 - Coming soon
Settings for a WIDE1-1 fill in
Many different TNCs can be used as fill in digis. These include the PK232, any MFJ, any TAPR-2 clones, any KPC3 or 3+, KPC9612 and many others. Check out these settings (text file). Here are the settings if you also want to send out an object beacon.
Here are some instructions to help you with setting up AGWUIdigi to act as a fill-in digipeater.
Overlay Characters for
Here is a list of characters to overlay in the stars that show the digipeaters on the map and what functions they can handle.
Radio / TNC Connections
GE Delta SX or S Connections
Here is a wiring diagram to go from the Delta to a 5 pin DIN plug for the MFJ TNCs.
GE/Ericsson MDX Connections
Pin Out of the 16 pin option connector here.
GE/Ericsson MDX Transmit
Here is where to adjust the transmit audio level of you VHF MDX
GE Phoenix Connections
Here is information on wiring a Phoenix to a TNC
Motorola Maxtrac series -
Radius M100 series Connections
Here is information on hooking up to the Maxtrac/Radius radio 3 different ways
Here is a link to the Batlabs Maxtrac/Radius webpage.
Here is wiring diagram of the Maxtrac/Radius mic jack.
Here is the pin out of the 16 pin Maxtrac/Radius jack on the rear of the radio.
Motorola Syntor X Connections
Here is a link to Mike Blenderman's website for making a Syntor X into a packet radio.
Here is a link to Mike Blenderman's main Syntor X webpage.
Here is a link to the Batlabs Syntor and Syntor X webpage. You can get a freeware copy of the SPROG eprom programming software here.
Kantronics KPC3 / KPC3+ Connections
Here is the pin out of the radio connection to the KPC3 and KPC3+
Anderson Power Pole Power
Here is the pin out of the standard Anderson Power Pole used by ARES/RACES.
If you have any other information that should be included on this page, please send it to Mark N9MEA at n9mea[at]wisconsinaprs[dot]net.