Archive for the ‘Interface’ Category.

Tiny, isolated USB to Xcvr interface (PTT, Audio, CAT, …)

I will descvribe here the USB interface between the redio station and the computer which I recently developed and tested. This post is a continuation of the first part, where I described a simple interface for controlling two digital lines using the USB / Serial Converter, where I presented simple interface to control two digital signals (e.g. PTT and CW). This time I will describe an interface that combines more functions:

  • Controlling several digital (switching) inputs and outputs,
  • Interface for controlling the station via the serial interface
  • Audio input and output interface (sound card)

I had some implementation issues with the microcontrollers and USB virtual com ports, which I have described in detail in the previous contribution, I decided it’s better using the tested solutions. The block diagram of the interface is swhown in following picture:

Block diagram of the interface

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Small USB to PTT/CW adapter

In this post, I will first introduce some of the basic technical background of the control of the transmit signal (PTT) and other signals (eg CW or linear activation). The second part will describe theĀ  interface development and the final product.

Standard DB9 male connector

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