1

Still in Development3 April 2019

• Basic Computer Complete

• 4 – USB2 Connectors

• BCM43438 WiFi and Bluetooth

• Low Energy (BLE) on board

• Runs on 5 volts through Micro-USB connector

• Video – built in HDMI

• 40pin extended GPIO

• 4 pole stereo output

• Software runs on SD Card

• Many options available –including color touch screens

• Software is a form of LINUX –no cost

• Starting cost – about $35

2

Three Experiments of Operation Using Raspberry Pi

Packet Radio

Experiment 1: Using Standard TNC

Experiment 2: Using Sound Card

Experiment 3: Using PCB -TNC

1. Radio2. TNC – Heathkit

HK-213. Interface Cable4. RS232 to

Raspberry PI interface or USB to RS232 Cable

5. Software

1. Radio2. Interface Cable3. USB Sound Card4. Software

1. Radio2. Interface Cable3. PCB-TNC4. Software

3

Experiment 3: Using PCB - TNC

1. Radio – checked and verified in Slide #9

2. Interface Cable – New interface cable to Radio

3. PCB-TNC

4. Software

4

Working the Experiment

• Detailed information:

• http://www.qrvtronics.com/CatHAM_Radio/files/MyPacketRadio_Experiment_3.pdf

5

End of Presentation - Questions?

6

Books and Other Material Websites

• Books

• Raspberry Pi 2 Workshop Manual (Haynes)

• Raspberry Pi for Dummies (Wiley)

• Websites

• https://www.raspberrypi.org/learning/software-guide/quickstart/

• https://raspberrypihq.com/

• TNC (Kit $40) https://www.tnc-x.com/TNCPi.htm

• Raspberry Pi: ($35)• https://www.adafruit.com/product/3775?src=ra

spberrypi

• OR https://www.newark.com/raspberry-pi/rpi3-modbp/sbc-arm-cortex-a53-1gb-sdram/dp/49AC7637?src=raspberrypi

• New Raspberry Pi Zero W – Just $10 https://www.adafruit.com/product/3400

7

Bibliography

• www.tapr.org

• M0HPA – for example

• http://www.g0hwc.com/raspberry-pi-ham-radio.html

• http://f6bvp.org/AX25_BBS_Node_RaspBerry_Pi_install.html

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Appendix

9

HK-21 Pinout Schematic HK-21 Pinout Motorola Microphone Pinout

Appendix

10

Pinout for PCB-TNC

Puxing Wiring

General Connection

Micro USB Connector

Cable for TNC-Pi

11

J1 – DB9 MaleP1 – 2.5 mm Stereo Phone PlugP2 – 3.5 mm Stereo Phone Plug

P13 2 1

3 2 1

TX AduioPTT

RX AudioGND

Speaker

Mic

Additional Products

12

$31.16

3.5 Inch 320 X 480 TFT LCD Display Touch Board - $16.51

Hard Disk Controller

13$33.65 Hard Disk Controller

https://www.banggood.com/X820-2_5-Inch-SATA-HDD-SSD-USB3_0-Storage-Expansion-Board-For-Raspberry-Pi-3-Model-B-2B-B-p-1170391.html?rmmds=myorder&cur_warehouse=CN