Pira.cz Technical Forum

General Category    (This section is not monitored) => Free Topic => Topic started by: radium98 on January 10, 2016, 02:29:39 pm

Title: pira.cz stereo encoder
Post by: radium98 on January 10, 2016, 02:29:39 pm

 :D hi i am going to make the stereo encoder and here is some pictures of the project thanks to Jan.Having 1 question i did not find the U7 - PIC18F1220-I/P  i tried to use PIC18F1320-I/P as it seems must work under the data sheet and its a bit pricy does it work or no ?
thanks

Title: Re: pira.cz stereo encoder
Post by: radium98 on January 13, 2016, 08:53:47 pm

Still cant burn the hex into the pic i think the 2 pics are fakes one be aware.

Title: Re: pira.cz stereo encoder
Post by: max-bit on January 21, 2021, 08:08:28 pm

Hi
I built a stereo encoder based on this project
https://pira.cz/eng/stk2en.htm
However, I have a problem with channel separation, it doesn't want to be better than the 35dB channel separation. This is not a problem of the receiver as it has a separation of ~ 43 dB (measured on a professional generator). What could be the problem?

I am attaching the eagle drawing.

thanks in advance for your comments and help

Title: Re: pira.cz stereo encoder
Post by: brashtrue on November 24, 2022, 04:47:46 am

The photo you provided isn't particularly valuable. Let's get a little more specific.

Title: Re: pira.cz stereo encoder
Post by: Rafael Reali on December 04, 2022, 05:06:02 pm

If you are testing the circuit on a PLL transmitter, it needs to have good damping (or delay) on the correction signal, otherwise it will combat the pilot signal from the stereo generator.

  I suggest testing the stereo circuit on a free oscillator.