Set your dish on True North (close enough is good enough) and rotate the LNB (as if you are adjusting skew) until the F connector is parallel to the ground.
Try again with your previously found satellite ...BUT - different LNB makes and models have the relationship between the F connector placement and signal polarisation ninety degrees out from others. So, if you can't lock a transponder just rotate the LNB ninety degrees, when you have locked a transponder of known polarisation fine-tune the LNB skew in the same manner as any other LNB.
You can of course use your spectrum analyser to peak the required transponders, rotate the LNB whilst watching the spikes and you will see the H polarisation signals come up as V polarisation goes down (and vice-versa)...but unless the spectrum analyser has high accuracy in regard to cursor/frequency you still will not know which 'set' of spikes you need to peak. With experience you can tell (yourself !) which set of spikes to peak for a given polarisation, indeed, you will be able to tell which satellite your dish is pointed at.
You can only be ninety degrees out after peaking the spikes....but it's usually on the incorrect polarisation ! .
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