MFJ MFJ-1270Pi Bedienungsanleitung

Raspberry Pi TNC

MFJ-1270Pi

INSTRUCTION MANUAL

Based on the original by John Hansen

MFJ Enterprises, Inc.

300 Industrial Park Rd. Starkville, MS 39759

P: (662) 323-5869

F: (662) 323-6551

DISCLAIMER

The information in this manual is for user purposes only and is not

intended to supersede information contained in customer regulations,

technical manuals or documents, positional handbooks, or other oﬃcial

publications. The copy of this manual provided to the customer will

not be updated to reﬂect current data. Customers using this manual

should report errors or omissions, recommendations for improvements,

or other comments to MFJ Enterprises, 300 Industrial Park Road,

Starkville, MS 39759.

Phone: (662) 323-5869

Fax: (662) 323-6551

Business hours: M-F 8:00 AM - 4:30 PM CST.

Contents

1 THE MFJ-1270Pi 1

2 SETUP 1

2.1 INSTALLINGRASPBIAN ................................ 1

2.2 CONFIGURATION PROGRAMS . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

2.3 CONFIGURING THE I2CPROTOCOL......................... 9

2.4 FACTORYRESET..................................... 10

2.5 CONNECTINGTHERADIO............................... 10

2.6 TRANSMIT AUDIO ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . 10

3 TECHNICAL ASSISTANCE 11

List of Figures

1 An MFJ-1270Pi stacked on a Raspberry Pi . . . . . . . . . . . . . . . . . . . . . . . 1

2 Openingtheterminal.................................... 2

3 TerminalWindow...................................... 3

4 Raspi-conﬁg......................................... 4

5 InterfacingOptions..................................... 5

6 SerialLoginDisable .................................... 5

7 SerialPortEnable ..................................... 6

8 ScriptSetup......................................... 7

9pitnc getparams Output .................................. 8

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MFJ-1270Pi Raspberry Pi TNC Instruction & Technical Manual

1 THE MFJ-1270Pi

Thank you for purchasing the MFJ-1270Pi Terminal Node Controller ™. This TNC is designed to

perfectly match the popular Raspberry Pi (Figure 1), allowing expasion of existing systems to

support TNC-based operations. The open-source Raspbian operating system provides a powerful

and ﬂexible base upon which to build any packet station. From portable setups to large, ﬁxed

stations, this board has been everywhere. The MFJ-1270Pi Raspberry Pi TNC ™supports the

packet TNC modes used for APRS iGates and Digipeaters and VHF packet for Winlink. It will

support HF Winlink with the addition of a Pactor or similar modem.

Figure 1: An MFJ-1270Pi stacked on a Raspberry Pi

2 SETUP

2.1 INSTALLING RASPBIAN

To use the MFJ-1270Pi, you will ﬁrst need a working Raspberry Pi. These can be ordered directly

from the Raspberry Pi Foundation at https://www.raspberrypi.org.

To install the Raspian Operating System on your Raspberry Pi, you will need to obtain a micro

SD card and install the OS image on it. The easiest way is to download the Raspberry Pi Imager

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MFJ-1270Pi Raspberry Pi TNC Instruction & Technical Manual

from https://www.raspberrypi.org/downloads. There are versions for Windows, MacOS, and

Ubuntu Linux.

WARNING

Make absolutely sure you are copying the image ﬁle onto your SD card, not onto

your hard drive! The Imager will overwrite everything on whatever drive you specify!

MFJ will take no responsibility for loss of data in this event!

After the imager ﬁnishes ﬂashing the SD card, insert it into the slot at the base of the Raspberry

Pi. Connect a mouse, keyboard, and monitor to the appropriate ports on the Raspberry Pi then

power up the Pi. At ﬁrst boot you will login with username “pi” and password “raspberry.” You

may change these later if you wish.

Figure 2: Opening the terminal

The Raspberry Pi’s serial port is disabled by default. To use it you will need to change the Pi’s

conﬁguration. Open a terminal window. You can open it from the desktop as shown in Figure 2,

or you can open it remotely if you have SSH enabled. Type

sudo raspi-conﬁg.

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MFJ-1270Pi Raspberry Pi TNC Instruction & Technical Manual

WARNING

With great power comes great responsibility! Your Pi will quite happily erase itself

if you make mistakes with sudo, undoing hours or days of work. If you are unsure of

a command, don’t run it! Always keep a backup just in case!

Figure 3: Terminal Window

Prefacing a command with sudo tells the OS that you want to run the command immediately

following as root. Root is the system administrator account on a Linux machine and has the

priveleges to do whatever it wants. Some advice regarding sudo and root priveleges in case you are

unfamiliar with Linux: do not run commands with elevated priveleges for no reason. As the

warning box above explains, root and other superusers can do anything they want to the operating

system, up to and including breaking it! Always take a moment to think through commands before

running them, especially as root! Do you really need to run them as root? Can they be eﬀective

with normal user priviledges? Pausing and thinking through things like this can prevent the

frustration of watching everything you spent the past few days building disappear behind a

blinking cursor forever (or at least until you work up the willpower to start again). Some functions

such as raspi-conﬁg must be run as root simply due to their nature (they by design make

system-level changes), but never develop the habit of just running commands as root for no reason.

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MFJ-1270Pi Raspberry Pi TNC Instruction & Technical Manual

Once you input the command, the following box will appear.

Figure 4: Raspi-conﬁg

Use the cursor keys to scroll down to “#5, Interfacing Options.” Then, on the next screen scroll

down and select “P6 Serial.”

When you do this you’ll get the following

Use the TAB key to highlight NO, then press ENTER. Next you will see

Use TAB to hightlight YES this time and press ENTER. Next, use TAB to highlight FINISH then

press ENTER. The Raspberry Pi will ask to reboot. Tell it yes.

It is a good idea to make sure Raspbian is up to date. If the Pi has internet access, you can do this

from the command line by entering the following:

sudo apt update && sudo apt upgrade

2.2 CONFIGURATION PROGRAMS

The programs pitnc getparams and pitnc setparams are used to display and change parameters

stored in the TNC-Pi board, including the TXDelay and the I2C address. The pitnc getparams

program will also provide you with a convenient way to make sure that your TNC is successfully

talking to the Raspberry Pi.

You will need to download these programs and save them to your Raspberry Pi. Open your

terminal and enter

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MFJ-1270Pi Raspberry Pi TNC Instruction & Technical Manual

Figure 5: Interfacing Options

Figure 6: Serial Login Disable

mkdir /home/pi/pitnc

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MFJ-1270Pi Raspberry Pi TNC Instruction & Technical Manual

Figure 7: Serial Port Enable

to create a directory called pitnc.∗Next type

cd /home/pi/pitnc

to move into the new directory. There are two ways to download the zip ﬁle containing the two

programs. The ﬁrst is to type

wget https://cdn.shopify.com/s/ﬁles/1/0289/7782/3843/ﬁles/params.zip

into the terminal. The second is to navigate the Pi’s web browser to www.mfjenterprises.com

and download the software from the MFJ-1270Pi product page. Once the ﬁle is downloaded and

placed in the /home/pi/pitnc directory, the command

unzip params.zip

will unpack the zip archive into two ﬁles. If you now enter ls -l, you will see the original zip ﬁle

and the two scripts. Note that both are colored white and are preceded by the characters

“-rw-r--r--”. This is Linux shorthand for who has what permissions. The ﬁrst dash indicates what

type of object is present. In this case, it is a ﬁle, so the space is a hyphen. The next three

characters are the user’s permissions. In this case the user can read (r) and write (w), but not

execute (x), these ﬁles. The next three are for the user’s group (they can only read), and the ﬁnal

three are for all users (again, they can only read). We need to give ourselves execute permissions

for these two scripts, and the command to do that is

∗If you have created a diﬀerent user, replace “pi” with your new username

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MFJ-1270Pi Raspberry Pi TNC Instruction & Technical Manual

Figure 8: Script Setup

chmod u+x pitnc*.

This instructs the OS to change mode (chmod) by adding execute permissions for the user (u+x)

to all ﬁles beginning with pitnc (pitnc*). Typing ls -l again now shows the two scripts in green

with an “x” now included in the permission string. We can now use these scripts to conﬁgure the

TNC-Pi. Your terminal should now look like the one in Figure 8.

If you are not already there, switch to the directory that you placed these programs in by using the

cd command just like earlier. The format for this script is

./pitnc getparams b n

where bis the bus name or number (/dev/serial0 for the serial port, 1 for the I2C bus), and nis

the device number (0 if using serial, between hexadecimal values 0x3 and 0x77 for I2C). Run the

following command:

./pitnc getparams /dev/serial0 0.

The ./ at the beginning of the line tells the Pi to look in the current directory. If you don’t

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