Author Topic: pira.cz stereo encoder  (Read 7299 times)

radium98

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pira.cz stereo encoder
« 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

radium98

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Re: pira.cz stereo encoder
« Reply #1 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.

max-bit

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Re: pira.cz stereo encoder
« Reply #2 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

brashtrue

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Re: pira.cz stereo encoder
« Reply #3 on: November 24, 2022, 04:47:46 am »
The photo you provided isn't particularly valuable. Let's get a little more specific.

quixotichare

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Re: pira.cz stereo encoder
« Reply #4 on: November 29, 2022, 02:46:18 am »
I also have a problem with demultiplexing, it doesn't want to be better than 35dB demultiplexing. I don't know how to solve it?

Rafael Reali

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Re: pira.cz stereo encoder
« Reply #5 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.