Yaesu FT-817 / FT-100 SoundCard Interface  

(The "Box")

Table of contents

Purpose

The purpose of the SoundCard Interface is to connect the Computers Soundcard to the Radios NF In and OUT Pins and (to some degree) to reduce noice and hum on the cable. This is accomplished by two NF Transformers. I know, there would be better, more sophisticated Ways to do this (like optical isolation etc.) but the way I did it is cheap, simple, easy to build and is small in size (and til now it works good).

DISCLAIMER:
THIS CABLE IS JUST ONE WAY TO CONNECT YOUR RADIO TO A PC - OTHER, MAY BE BETTER WAYS,
MAY EXISTS - IT'S UP TO YOUR RESPONSIBILITY IF YOU BUILD AND USE THIS CABLE. UNDER NO 
CIRCUMSTANCES I AM RESPONSIBLE  FOR ANY DAMAGES TO YOUR RADIO OR PC! THIS  DEVICE WAS 
TESTED  WITH  DIFFERENT  RADIOS AND PC'S AND  UNTIL  NOW IT  WORKS WITHOUT  PROBLEMS.

Schematics

The Schematic is so far very simple. Just two NF Transformers and two Trimmers to adjust the NF Levels - that's it.
 
Soundcard Interface
Image 1: Soundcard-Interface

The Box can be used in combination with my Cat Interface Cable as you can see on Image 2.

Cable overview
Image 2: Cable overview

The PCB

Sorry there is no PCB available at the moment. The reason is that I try to include a Tuning aid (like One Touch Tune) in the Box. If this is finished I will make a PCB for the Box. For now it is just prototyped on Perfboard as you can see on the Pictures.

Pictures of the finished Box
(Prototyping version)

Prototype Box
Image 3: Interface Box

 

Close Up of Box
Image 4: Close Up of Box

 
Mounted Box
Image 5: Mounted Box - Front

  Mounted Box
Image 6: Mounted Box - Back

Mounted Box
Image 7: Mounted Box - Side

 

Notes & Comments

Some notes to the Box:
If you have any comments or sugestions just drop me a line.

73, OE1RIB