im sorry i use a pulse signal infact

 

Hello Bordodynov, the model for the cable you use is like that right?

 

No it's not. I'm breaking the cable into pieces. I also uploaded you the equivalent circuit - post #11. That post shows an equivalent circuit of a cable with a shield with 1024 sections. I used LTspice's ability to use an array.

 

Here is an example of a 22-bit counter. I think you should get the idea.

 

Hello Bordodynov!! tks for your help!!
but using the test circuit with the Ltc2862 I noticed that the signal is not attenuated by using a cable length of 600 meters at a frequency of one Mhz. Are you sure Len is in meters and not feet?

 

the signals i consider are ltc2862 transmitter input and ltc2862 receiver output. From datasheet with a 1Mhz signal I can transmit up to 200 meters maximum

 

thanks Bordodynov, can you explain me the parameters you used? r, cws etc (
the parameters you used are those of cat5?) ... the component you used on ltspice to simulate twisted cables what is it called? thanks again for your help

Hello-
What did you use for "twisted_pair.lib", LTSPICE complains this is missing when I try to use the twisted pair symbol.

 

Hi cj,
Try this @Bordodynov link.
E
https://yadi.sk/d/6nSSUmZiT9oCoQ