Cables and connectors for connection between the PK-232 TNC and Yaesu FT-847 for HF

FT-847 Data Connector for HF Digital Modes

The FT-847 uses a 3.5mm stereo jack for HF digital signals, and therefore is fairly easy to connect to a TNC. The difficulty with the PK-232 is the lack of TNC connectors, if you are not lucky to get cables with your TNC. I didn't with any of my TNC purchases, so looked around in the supplies boxes and USB 5-pin Motherboard headers work just fine. These are wired to a small piece of strip board to populate the Capacitor/Resistor circuit to provide PTT, as designated by the Yaesu Radio User Manual.

The cables need to be at least shielded and wired to provide good ground connections between the TNC and Radio, else ground loops will give poor signals, transmit and receive. I have used JY-8022 Audio Cable (Twin shielded cable, in 8-form), Neutrik 3.5mm Jack and a homebrew TNC connector.

Parts

JY-8022 Twin Audio Shielded Cable
2k Ohm 1/4 watt Resistor
10 uF Electrolytic Capacitor
5 pin Female Dupont Connector
REAN Stereo NYS231BG-LL Extra large entry 3.5mm Mini Jack plug


Assembly

Connect as diagram with 3.5mm Jack TRS ;

Tip - Signal T
Ring - Signal R
Sleeve - Ground

Connect Veroboard as circuit diagram ;

PK-232 TNC connector ;

Pin 1 - RX Audio = Signal R
Pin 2 - TX Audio = Signal T
Pin 3 - N/C
Pin 4 - Gnd = Ground
Pin 5 - PTT = Via Veroboard circuit

 

AEA pin-out for PK-232

 

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