When capturing a glide slope above 3 degrees eg 9 degrees the standard text reads
The false glide slopes occur at odd multiples of the true glide-slope angle (typically 3°) (i.e., at 9° and 15°). At even multiples (6°, 12°), a centered glide-slope needle occurs, but this is because of a null signal; reverse sensing is present above and below glide slopes
This I understand, but when you look at the associated diagram it shows the lobes at 9 and 15 degrees as 90hz above and 150hz below, the same as 3 degrees. How then do you get reverse sensing ie a fly up when it should be fly down if the lobes are the same as at 3 degrees.
Should the picture show the lobe frequencies reversed for 9 and 15..??.
Thanks