Mobilinkd TNC3 User manual

TNC3 User Guide
Mobilinkd TNC3 User Guide
Rev B - 2019-06-10
Thank you for purchasin your new Mobilinkd TNC3 Battery-powered Bluetooth TNC.
This TNC is desi ned to suit all aspects of the Amateur Radio community. It is ready to plu in and o
with easy to use and intuitive confi uration software, and it is completely open for experimentation.
The schematics are published and all software used in the TNC is open source and available online.
Warning
Do not store your TNC where prolonged exposure to extreme temperatures can occur (such
as in the trunk or cabin of a car). It can cause permanent damage.
•hort term storage: -4° – 140°F (-20°C – 60°C)
•Long Term torage: 32° – 77°F (0°C – 25°C)
•Operating Temperature: -4°F – 131°F (-20°C – 55°C)
Regulatory Information
This is the stuff I am le ally obli ated to put in this document If I am obli ated to put it in here, you
are obli ated to read it. Enjoy!
United States of America
Contains FCC ID:A8TBM78ABCDEFGH
This device complies with Part 15 of the FCC Rules. Operation is subject to the followin two
conditions: (1) this device may not cause harmful interference, and (2) this device must accept any
interference received, includin interference that may cause undesired operation
This equipment has been tested and found to comply with the limits for a Class B di ital device,
pursuant to part 15 of the FCC Rules. These limits are desi ned to provide reasonable protection
a ainst harmful interference in a residential installation. This equipment enerates, uses and can radiate
radio frequency ener y, and if not installed and used in accordance with the instructions, may cause
harmful interference to radio communications. However, there is no uarantee that interference will not
occur in a particular installation. If this equipment does cause harmful interference to radio or
television reception, which can be determined by turnin the equipment off and on, the user is
encoura ed to try to correct the interference by one or more of the followin measures:
• Reorient or relocate the receivin antenna.
• Increase the separation between the equipment and receiver.
• Connect the equipment into an outlet on a circuit different from that to which the receiver is
connected.
• Consult the dealer or an experienced radio/TV technician for help.
• Or, you know – you’re a licensed amateur radio operator. Figure it out!

TNC3 User Guide
Canada
Contains transmitter module IC: 12246A-BM78SPPS5M2
This device complies with Industry Canada license-exempt RSS standard(s). Operation is subject to the
followin two conditions: (1) this device may not cause interference, and (2) this device must accept
any interference, includin interference that may cause undesired operation of the device.
Le présent appareil est conforme aux CNR d'Industrie Canada applicables aux appareils radio exempts
de licence. L'exploitation est autorisée aux deux conditions suivantes: (1) l'appareil ne doit pas produire
de brouilla e, et (2) l'utilisateur de l'appareil doit accepter tout brouilla e radioélectrique subi, même si
le brouilla e est susceptible d'en compromettre le fonctionnement.
Under Industry Canada re ulations, this radio transmitter may only operate usin an antenna of a type
and maximum (or lesser) ain approved for the transmitter by Industry Canada. To reduce potential
radio interference to other users, the antenna type and its ain should be so chosen that the equivalent
isotropically radiated power (e.i.r.p.) is not more than that necessary for successful communication.
Conformément à la ré lementation d'Industrie Canada, le présent émetteur radio peut fonctionner avec
une antenne d'un type et d'un ain maximal (ou inférieur) approuvé pour l'émetteur par Industrie
Canada. Dans le but de réduire les risques de brouilla e radioélectrique à l'intention des autres
utilisateurs, il faut choisir le type d'antenne et son ain de sorte que la puissance isotrope rayonnée
équivalente (p.i.r.e.) ne dépasse pas l'intensité nécessaire à l'établissement d'une communication
satisfaisante.
The TNC does not contain a user modifiable antenna – unless you have a soldering iron. Then all bets
are off. You’re an ham radio operator. Go wild.
Europe
The Microchip BM78 radio module inside the TNC3 has been fully tested to comply with EC
requirements for CE markin . These tests include Health, Safety, EMC and Radio. Further testin of
the final product (the TNC3) was conducted to ensure compliance of the inte rated product.
The TNC3 is RoHS compliant. Still, I would avoid eating the PCB if I were you.
Japan
Inte ration of this module into a final product does not require additional radio certification provided
installation instructions are followed and no modifications of the module are allowed.
So, if you are in Japan, you cannot modify the Bluetooth module. You’ve been warned.

TNC3 User Guide
Korea
I think Korea requires that I provide a user manual in Korean. I don’t (yet) speak, read or write the
language. Sorry. Give Google Translate a try:
Taiwan
注意 !
依據 低功率電波輻射性電機管理辦法
第十二條 經型式認證合格之低功率射頻電機， 經許 可，
公司、商號或使用者均不得擅自變更頻率、加大功率或 變更原設計
之特性及功能。
第十四條 低功率射頻電機之使用不得影響飛航安全及 干擾合法通信；
經發現有干擾現象時，應立即停用，並改善至無干擾時 方得繼續使用。
前項合法通信，指依電信規定作業之無線電信。
低功率射頻電機須忍受合法通信或工業、科學及醫療用 電波輻射性
電機設備之干擾。

TNC3 User Guide
Overview
This uide will introduce you to the key features of the TNC, its connectors, switches and indicator
LEDs. Most of this manual illustrates the confi uration and operation of the TNC usin an Android
device and Android software. However, the TNC will work with any operatin system and software
that can talk to a KISS TNC over Bluetooth SPP (Serial Port Profile), Bluetooth LE usin our custom
service, or via USB CDC (serial port emulation).
K SS TNC
The TNC3 is a KISS TNC, which means that it is purely a modem and not really a terminal node
controller. A more accurate description of the TNC3 and all KISS devices is a KISS modem. The
TNC3 does not manipulate the packets it receives in any manner. It cannot, by itself, di ipeat (relay)
packets or do any store and forward operations associated with an intelli ent TNC. This is an
important point that can be a source of some confusion. A KISS TNC simply encodes and decodes
di ital information as audio that can be transmitted over the air by a radio on a voice channel.
The Mobilinkd TNC System
The Mobilinkd TNC System is comprised of three physical components: A radio, the Mobilinkd TNC,
and a computer, tablet or smart phone that supports Bluetooth SPP or LE-TNC. The TNC connects to
the radio with a cable and talks to the smartphone or computer via Bluetooth connection.
The TNC3 is also able to talk to the phone, tablet or computer via USB serial port emulation.

TNC3 User Guide
TNC Switches, Connectors and ndicators
The Mobilinkd TNC3 has three switchs, two connectors and two indicators. Each of these is shown in
the ima e and described below.
S1 – Power button. Press briefly to turn on. Power/BT LED will flash. Press briefly to turn off. The
power/Bluetooth LED will turn off.
S2 recessed reset switch. To reset the TNC, carefully insert the tip of a pen into the hole and ently
depress the switch.
S3 recessed DFU button. This is used when updatin the device firmware. To enter firmware update
mode, carefully insert the tip of a pen into the hole and ently depress the switch.
USB – Micro-USB connector for char in /power/USB serial port.
TRRS – 3.5mm TRRS audio connector for Radio.
1. Tip = Speaker (audio input to TNC)
2. Rin 1 = PTT (Simplex PTT mode)
3. Rin 2 = Mic (and PTT in Multiplexed PTT mode)
4. Sleeve = GND/Common
RGB LED – This is a mult-function indicator. The blue LED flashes slowly when disconnected,
flashes a double-blip when connected via Bluetooth, or flashes a triple-blip when connected via USB.
The LED shows red when transmittin and reen when receivin data.
Power button
TRRS
Micro-USB
RGB LED
Red LED
Reset Button
DFU Button

TNC3 User Guide
Red LED – Char e indicator. On when connected to USB and char in , otherwise off.
Before First Use
The battery will not be fully char ed when you receive the TNC. It is always best to plu in a micro-
USB cable and char e the battery before first use. When the red LED turns off, the battery is char ed.
The battery will typically last for 48 hours of continuous use.
TNC Cable
The TNC must be connected to the radio via a cable. Mobilinkd sells cables for a wide ran e of hand-
held radios, as well as data cables for mobile and base radios with TNC ports.
The cable connects four si nals:
1. Audio in (this is the speaker or data out on the radio)
2. Audio out (this is mic or data in on the radio)
3. PTT si nal
4. Common (GND)
On some hand-held radios, the PTT si nal is multiplexed onto the audio output. In this case, the
dedicated PTT si nal is not used.
Unlike with the TNC1 or TNC2, the TNC3 incorporates ferrite beads on the PCB so attachin a ferrite
bead to the cable is not the necessity that it once was. The TNC is expected to operate properly without
a ferrite bead on the cable. However, if the cable is bein run ri ht next to the antenna, it does not hurt
to add one.
Radio Settings
Each radio is different, so havin a comprehensive list of optimal settin s in a document like this is not
possible. However, it is important to understand what radio settin s impact the performance of the
TNC and its ability to decode packets.
The squelch should be left open on the radio when connected to the TNC. The TNC3 will detect the
presence of data on the audio si nal (it uses DCD or Data Carrier Detection). With a closed squelch,
part of a packet preamble will be missed before the squelch on the radio opens. This will prevent
decodin of packets.
The “Battery Saver” option should be disabled. This should have no impact on the life of the battery
when the radio is run with an open squelch.
If you have an inexpensive Chinese radio (Baofen , Wouxun, and many others) with a “Dual Receive”
feature, this must also be disabled. This essentially operates the receiver as a scanner, switchin the
receiver between two frequencies. In general, with these radios, every setting that can be turned of
should be turned off. That is especially true for any squelch tail elimination settings.
Please allow me to editorialize for a moment. The quality of the radio will directly impact the ability of
the TNC to decode packets. Do not connect the TNC3 to a cheap radio and expect miracles. The
system is only as stron as its weakest link.

TNC3 User Guide
Connecting the TNC
Connect the TNC to the HT with both the TNC and the
radio turned off.
Plu the 3.5mm connector into the TNC. Plu the
radio connector (these styles vary) into the radio's
Speaker/Mic connector.
Connecting/Pairing
Detailed instructions for pairin the TNC on Android are below. Instructions for iOS are omitted
because this happens more seamlessly with BLE.
1. Press S1 briefly to turn on TNC. The blue LED will flash slowly.
2. Ensure Bluetooth is enabled on other device.
3. On other device, scan for Bluetooth devices. You should see “TNC3 Mobilinkd”.
4. Connect to “TNC3 Mobilinkd”. The pairin should happen automatically.
Pairing with an Android Device
1. Install the Mobilinkd Confi uration App for Android (available on Goo le Play.)
2. Open the Mobilinkd app.
3. Press S1 briefly to turn on TNC. The blue LED will pulse slowly.
4. Open the app menu and select “Bluetooth settin s”
5. In the Bluetooth settin s menu, select “Pair new device”
6. When you see “TNC3 Mobilinkd” under “Available devices”, select it.
7. After a few seconds, you should see the TNC appear under “Currently connected”.
8. Hit the back button to o back the the Mobilinkd app.

TNC3 User Guide
Configuring the TNC
This section describes the confi uration process usin the Mobilinkd Confi App for Android. The
Mobilinkd Confi App for iOS will be very similar, except the connection and pairin is sli htly
different (a little less intrusive).
This section assumes that you have followed the “Pairin with an Android Device” section above and
have the Mobilinkd TNC confi application runnin . The TNC and radio should be connected, the
TNC should be on, and the radio should still be off at this point.
1. Push the “Connect” button to connect the Mobilinkd TNC Bluetooth device. You will see the
device name and firmware version displayed.
The ima e on the ri ht shows the main menu for the Mobilinkd Confi app. This menu is the startin
point to launch the various screens shown in the documentation below. When you are done with a
certain activity, press the “Close” button to o back to this screen.

TNC3 User Guide
Configuring the Power Settings
You can check the battery level and confi ure the power settin s from the
“Power Settin s” dialo . The TNC3 is fully char ed when it reads
approximately 4.2V (4200mV). The nominal battery volta e is 3.7V. Avoid
operatin the TNC below 3.4V, otherwise erratic behavior may occur.
The TNC may be confi ured to automatically turn itself on when USB power
is present, and automatically turn itself off when USB power is not present.
This is often desirable when usin the TNC in a vehicle. These settin s are
controlled independent of one another.
•To power on when USB power is present, select the “Power on with
USB Power” option.
•To power off when USB power is removed, select the “Power off with
USB Power” option.
The TNC3 will still power on via the Power button when USB power is not
present and “Power off with USB Power” is enabled.
Please be aware: It is a frequent source of confusion for users when they have removed a TNC
normally used in a vehicle and have for otten that these settin are enabled. The TNC will turn itself
on and off when connected/disconnected from USB power.

TNC3 User Guide
Configuring Receive (RX/ nput) Volume
The radio's volume level must be properly adjusted for optimal packet
decodin . Press the “Audio Input Settin s” button.
1. Turn the radio on. If the squelch is set to be open (as you did
when followin the instructions above), you should see the input
volume level on the audio meter.
2. The TNC has the ability to amplify low-level audio inputs
typical of mobile radio data ports. For almost all hand-held
radios, the input ain level should be set to 0.
3. Adjust the volume on the radio until the volume meter li hts up
the ri ht-most level indicator.*
4. If you cannot turn up the volume hi h enou h on the radio to
li ht up the ri ht-most indicator, increase the input ain level.
5. The input twist should typically be set to 6dB when usin an
audio si nal (hand-held speaker output, 1200 baud data output)
and 0dB when usin correlator output (9600 baud data
output).**
6. You can press the “Auto-adjust button” if you are darin . This is best used when connectin to
a mobile radio when the input ain and input twist need to be adjusted.
7. Press the Close button to return to the main menu.
* If your radio uses the volume knob for on/off, it may be helpful to mark on the radio and knob with
the optimal volume settin so it can be set quickly after turnin on the radio.
** The input twist level controls various filter parameters in demodulator. Adjustin the input twist
may chan e the ability (for better or worse) of the demodulator to decode packets.
Configuring Transmit and (TX/Output) Volume
Select the “Audio Output Settin s” button on the main menu to open the
audio output settin s.
Modern ham radios use two different si nalin methods for the Push-to-
Talk (PTT) si nal, which causes the radio to transmit.
Most base stations, mobile ri s (anythin that uses a MiniDIN-6 data
connector) and any radios with a Kenwood-style connector use a
separate PTT line to tri er PTT. This form of PTT si nalin is called
“simplex” since there is one si nal on the line.
Many HTs (Yaesu, Icom, Alinco and others) use the Mic+ line for both
audio and PTT si nalin . This form of PTT si nalin is called
“multiplex” since there are multiple si nals on the same line.
If you don't know which one yours uses, trial and error works to fi ure it
out. Press the Transmit button on the bottom to transmit a test si nal.
You should see the TX indicator on the radio li ht up.

TNC3 User Guide
Transmit (TX/Output) Volume
Confi urin the transmit volume requires a second radio and, without expensive monitorin equipment,
will be a bit subjective. The default volume level (64) is a reasonable startin point. It may not be
necessary to adjust the volume level at all. I recommend lowerin the level.
This exercise is best done with the TNC/radio connected to a dummy load or at very low power. Both
radios should be set for simplex on an open frequency so as not to interfere with others. Do not adjust
the radio's output volu e while tuned to the pri ary APRS frequency.
To adjust the radio volume, select 2200Hz tone button, then press the Transmit button.
While monitorin the tone on the second radio, adjust the Output Volume slider until you do not hear
the volume increasin any more. Then back off the volume by 10%.
You cannot adjust the output volume unless the Transmit button is selected. This is by desi n, to
prevent accidentally chan in the output volume.
Troubleshooting: If you do not hear the any audio or the TX indicator on your radio does not light up,
verify that the PTT Style selected above is correct. Disable TX, then change the PTT Style selection
and try again.
Output Twist
Output twist controls the level of the Mark and Space (1200Hz and 2200Hz) tones relative to one
another. Levels below 50 reduce the level of the 2200Hz tone, while levels above 50 reduce the
1200Hz tone. The output twist should typically left at 50 unless you are usin a transmitter that does
not do proper pre-emphasis of the audio si nal.

TNC3 User Guide
Configuring the K SS Parameters
These parameters are best left at their default values:
TX Delay – 33
Persistence – 64
Slot Time – 10
TX Tail – 2
TX Delay represents the amount of time in 10s of milliseconds that the
TNC will key the radio and transmit the preamble before sendin the
packet.
Persistence is part of the CSMA backoff represents the odds (out of 256)
that the TNC will transmit within its slot time when no carrier is detected.
Slot Ti e is also part the the CSMA protocol; it is the delay in 10s of
milliseconds that the TNC waits before checkin whether it can transmit.
TX Tail is the amount of time in 10s of milliseconds the TNC keys the
transmitter after the packet is sent. It must always be 2.
Full Duplex – i nore carrier detect and the CSMA parameters and trasmit without waitin for a clear
channel. The assumption is that while runnin duplex, the TX channel is always clear.
Please see http://www.ka9q.net/papers/kiss.html for a more in depth discussion of these KISS
parameters.

TNC3 User Guide
Firmware Update
The firmware of the TNC can be updated, but this can only be done via USB.
The TNC firmware is updated usin STM32CubePro ammer from STMicroelectronics. This is a
cross-platform pro rammer for Linux, OS X and Windows.
You can find this tool from the Mobilinkd Download site at http://www.mobilinkd.com/downloads/ or
from STMicroelectronics at https://www.st.com/en/development-tools/stm32cubepro .html
Firmware update instructions will be posted with the firmware file.
The TNC enters firmware update mode by pressin the DFU button on the side when the TNC is
plu ed into a USB connection. Be warned: the only indication that the TNC is in DFU mode is that
there is no blue LED indicator when in this mode, and the power switch does not work. If you do not
use the firmware update tool to pro ram the TNC, you must press the reset button to recover.
Recommen ations For Use with APRS roi
This assumes that you know have followed the “Connectin /Pairin ” and “Confi urin the TNC” steps
above. This is a ood first-time setup and should be customized to your needs once you are familiar
with APRS and APRSdroid.
You are encoura ed to download the APRSdroid software from Goo le Play. You can also find the
software at http://aprsdroid.or /. Detailed APRSdroid confi uration documentation can be found on
the APRSdroid GitHub site: https:// ithub.com/ e0r /aprsdroid/wiki/Settin s.
Before startin , turn the radio off to avoid accidentally transmittin bad APRS data.
1. Ensure the TNC is on and paired with the Android device. Make sure the Mobilinkd Config
app is disconnected and that you have exited the app. Leavin the Mobilinkd Confi app
connected will prevent APRSdroid from connectin to the TNC.
2. Start APRSdroid.
3. Go into Menu|Preferences
1. Set your callsi n
2. Set your SSID. SSID 7 is common for hand-held radios.
3. Under APRS di i path”, enter “WIDE1-1,WIDE2-1”
4. Set your APRS symbol. If you don't know which one to use, choose /[ for now. That will put
a “jo er” symbol on the map for your position.
5. Personalize the comment field.
6. Go into “Location Settin s”
1. Under “Location Source”, select “Periodic GPS/Network Position”. (You may wish to
chan e this later.)
2. Under “GPS Precision”, select “Low”. If this device connects to a mobile phone
network, select “Use network position”.
3. You may wish to update the “Minimum update time” and “Minimum update distance.”

TNC3 User Guide
7. Go into “Connection Preferences”
1. Under “Connection Protocol”, select “TNC (KISS)”.
2. Under “Connection Type”, select “Bluetooth SPP”.
3. Under “TNC Bluetooth Device”, select “TNC3 Mobilinkd”
4. Return to the main screen.
5. There are three views: Hub, Map, and Lo . Ensure you are in Lo view.
6. Select “Start Trackin ”.
7. The blue LED should start blinkin more slowly (two brief blinks every 2 seconds).
8. You should see a reen line in the APRSdroid lo where it sent a position report to the TNC.
If you receive an error “java.io.IOException” in the lo when tryin to connect, verify that the TNC is
on and that it is flashin slowly (no established connection). If the TNC is flashin slowly with a
double-pulse, it is connected to another app.
Sending your First Packet
1. Turn on the Radio and ensure its volume level is set properly.
2. Tune the radio to your primary APRS frequency .
3. Press S1 briefly to turn on the TNC. The blue LED will pulse slowly.
4. Start APRSdroid and select “Start Trackin ”. The LED will flash slowly when connected. This
will immediately beacon your position.
When testin the TNC, it is best to ensure that a di ipeater is nearby or that you have another
APRS/packet radio to test with. A hand-held radio will typically need line of si ht to a di ipeater
within 3-5km (2-3 miles) in order to have the si nal di ipeated.
Listen to the audio on the local APRS frequency. If at least some of the
si nals are clear and free from static or audio distortion, the TNC
should be able to decode those APRS packets.
Some adjustment of the audio level may be required to et optimum
packet decodin . Every radio model is different and the volume levels
necessary may vary considerably. Even after followin RX audio
confi uration steps above, the volume level may need to be adjusted to
et the optimal performance out of the system.

TNC3 User Guide
Troubleshooting
Cannot Connect to TNC
•Make sure no other applications are currently connected to the TNC. Only one application can
connect to the TNC at a time. The TNC should be pulsin slowly. You may need to reboot
your device to et it to release the Bluetooth connection. When usin APRSdroid, make sure
that you press “Stop Trackin ” before attemptin to use the Mobilinkd Confi app. Conversely,
when usin the Mobilinkd Confi app, make sure you “Disconnect” before you attempt to use
APRSdroid. (BLE connections do not have the same limitations, but this has other
consequences.)
•Turn off WiFi on the device. Some older Android devices do not operate well when both
Bluetooth and WiFi are enabled. Both use the same 2.4GHz ISM band for communication and,
if not mana ed properly, can interfere with one another.
•Power cycle the TNC.
•Re-pair with the TNC.
•Plu the TNC into USB power.
Cannot Communicate with TNC
•Verify that the connection is established by watchin the blue LED. If it is pulsin slowly, the
TNC is on and disconnected. If it is blinkin with a double-blip, the TNC is connected via
Bluetooth (either SPP or LE). If it is blinkin with a triple-blip, it is connected via USB.
•Try to connect usin different connection protocols (USB and Bluetooth)
•Press the reset button. Please send email to s[email protected] if you find this necessary.
TNC Will Not Decode Packets
•Verify that the TNC's battery is fully char ed. Plu the TNC into USB power and see if the
problem persists.
•Verify that stron TNC packets can heard on the channel.
•Verify that the TNC can detect the audio and the RX volume is adjusted properly.
•Press the “Auto-adjust” button on the Audio Input screen of the confi app.
TNC Will Only Decode Packets with Squelch Open
•That is expected. The radio’s squelch settin should be open (set to 0).

TNC3 User Guide
No RX Audio Detected
•Ensure that the cable is firmly plu ed into the radio and into the TNC.
•Verify connectivity on the cable.
•Verify that the radio’s squelch is open.
TNC Will Not Transmit
•Verify that it is not an improper APRS software confi uration by usin the Mobilinkd
Confi uration App to send tones. (See Configuring Transmit Volume above.)
•Ensure that the cable is firmly plu ed into the radio and into the TNC.
•Verify that PTT Style is set properly for the radio.
•Verify cable continuity.
•If the TNC will transmit in the confi app but not in the packet radio software, verify your
software settin s, your location settin s, your minimum update settin s, etc. Contact your
packet radio software provider for support.
Packets Not Digipeated
•Make sure packets are bein transmitted.
•Make sure packets can be decoded.
•Make sure di ipeater is in ran e.
•Get closer to the di ipeater.
Transmitted Packets Not Decoded
•Lower the transmit volume . (See Configuring Transmit Volume above.)
•Verify the radio is on the correct frequency.
•Try a different receiver and TNC.
•Increase the TX Delay KISS Parameter. (Values above 50 are not recommended and may reduce
APRS network bandwidth in con ested areas.)
Not Showing Up in APRS- S (or on aprs.fi)
•Make sure an iGate is in ran e of your radio.
•Move closer to the iGate.

TNC3 User Guide
TNC Resets When Transmitting
Do not operate the TNC if it is resettin when the radio transmits. This is typically indicates
that stron RF fields are affectin the TNC's circuitry. This may dama e the TNC.
•Check the radio antenna, the radio itself, and the TNC cable for dama e.
•Re-position the TNC and cable away from the radio's antenna.
•Try another radio.
•Install a ferrite bead on the cable between TNC and radio.
Software Customization
The TNC has a USB DFU bootloader. Firmware can be updated over the USB connection usin the
STM32CubePro rammer.
STM32_Programmer_CLI -c port=USB1 -d firmware.elf - -g 0x8000000
For the more adventurous types, the TNC has a 6-pin ST/LINK connector. The ST/LINK is
pro rammed usin a 6-pin po o-pin adapter (such as
https://www.tindie.com/products/FemtoCow/po o-pin-adapter-row-of-2-to-30-pins/) that is pressed
onto the 6 pin connector.
For most of the development cycle of the TNC, I used an STM32 Nucleo-64 board with it’s on-board
ST/LINK pro ammer and a po o pin adapter.
The code runnin on the TNC is available on GitHub. See http://www.mobilinkd.com/ and follow the
links to GitHub. The firmware for the TNC3 is in the tnc3-firmware repository.
This firmware is released under the GPL. Hackin (AKA “voidin your warranty”) is hi hly
encoura ed.
https:// ithub.com/mobilinkd/tnc 3-firmware – latest firmware
Acknowle gments
APRSdroid is written and maintained by Geor Lukas, DO1GL.
APRS is a re istered trademark of Bob Brunin a, WB4APR.
Copyright
Copyri ht 2015-2018 Mobilinkd LLC. All Ri hts Reserved.