Peak Q Using a ku/c LNBF

[stanleyjohn]

I'm using a DMX 741 LNBF and on a few satellites which have both Ku and c i need to move my dish alittle to peak the Q on the C vs KU! When this happens i try to pick a happy medium for the both which is ok but sacrifices alittle of the gain on both.My Question is it normal to find two different peaks in Q on a satellite which has both c and Ku? Note!! like i said before!this happens on just a few scattered satellites.

 

[Long Hair]

I'm using a DMX 741 LNBF and on a few satellites which have both Ku and c i need to move my dish alittle to peak the Q on the C vs KU! When this happens i try to pick a happy medium for the both which is ok but sacrifices alittle of the gain on both.My Question is it normal to find two different peaks in Q on a satellite which has both c and Ku? Note!! like i said before!this happens on just a few scattered satellites.

I've read that this is caused by the focal length not being perfect.

 

[putney]

I see them being off a bit from time to time.
But I save C and ku separate in my sat list. [121Ku, 121C, etc]