Audio Interfacing for APRS and Digital and SSTV modes

Micro-Trak RTG 50 - $210 without GPS or Antenna

Micro-Trak RTG FA, GPS, Antenna Combo - $220 http://www.byonics.com/mt-rtg

Micro-Trak AIO w/ V2 rubber duck antenna - $260 http://www.byonics.com/mt-aio

“Simple” Route for APRS tracker Pay $95+Shipping for a bundle from Argent Data Sytems https://www.argentdata.com/catalog/product_info.php?products_id=154

Tracker3 Model T3-Mini https://www.argentdata.com/catalog/product_info.php?products_id=167

Opentracker Plus Radio DB-9

Simple Digital/SSTV Interface Pay about $120+shipping for an Tigertronics SignaLink™ USB http://www.dxengineering.com/parts/tgr-slusb13i-p

Make Your Own Interface- Web Pages of Interest http://www.qsl.net/wm2u/interface.html http://www.soundcardpacket.org/ https://sites.google.com/site/kh6tyinterface/ http://www.g4ilo.com/usblink.html http://www.w1hkj.com/FldigiHelp-3.21/html/w5zit_rt_channel_page.html http://www.w1hkj.com/FldigiHelp-3.22/CWkeyingCircuit.png http://wa8lmf.net/ham/tonekeyer.htm#KH6TY tablet Interface

https://sites.google.com/site/kh6tyinterface/

http://www.g4ilo.com/usblink.html VOX circuit

W5ZIT Interface from fldigi manual

CW Keying form fldigi manual http://www.w1hkj.com/FldigiHelp-3.22/CWkeyingCircuit.png

APRS Soundcard Programs https://github.com/wb2osz/direwolf/releases http://www.sv2agw.com/ham/packet.htm http://uz7.ho.ua/packetradio.htm

Aspects Mechanics Electrical Type/Pinout of Connector 6-pin and 13-pin mini-DIN, RJ-45, RJ-22 etc fit of parts(eg heat sink clearance) Tip, Ring(s) and Sleeve oh my Electrical Isolation Voltage, Current and Impedance Levels

Typical APRS Tracker Pinout

Kenwood TM-D710 6-pin Mini-DIN Radio Audio Pinout DE=Ground PKD=Audio input PR1=Receiver 1200baud output PR9=Receiver 9600baud output PKS=PTT Yaesu FT-897 Radio Audio Pinout is the same

Fit of Parts Be aware of the clearances need by YOUR radios connects FT-897 input for the CW key is a 1/8”(3.5mm) STERO phone jack. Adapters for ¼” to 1/8” do not always fit flush due to the heat sink.

TRRS=Tip-Ring-Ring-Sleeve

Kenwood TH-F6A Speaker/Mic Pinout usable for Chinese Radios

Isolation and level control Transformers for audio signals Opto-Isolator for serial/parallel port PTT Use Speaker/Headpone from computer Use Mic input to computer Use attenuator to make coarse level adjustments

Acoustical Interface