Why are some channels not added?

Question

A television

Receiver svec-6900.
Here is a list of channels from Yamal: flysat.com/yamal90.php
TV channel "Friday" is normally added, for example. And it works fine.
And if I want to add, for example, "Channel One", or "Russia 1", then when searching, they do not receive a signal. And so many channels. Maybe the receiver is limited, or maybe you need to flash it better? Maybe it's the converter?

Answer 1

maybe because they are broadcast from a different transponder and with a different polarization? You can try to twist the LNB module.
Or maybe because they come with a different modulation and mpeg4, unlike Friday, which broadcasts in dvb-s2 format. Maybe your console does not support these formats.