In article ,
says...


Update:

It appears this whole topic is meaningless and the result of
somebody's error.

Fine, but who's error?


It turns out that all current GA nav radios support 50kHz spacing
(therefore 40 channel glideslope).


Did you do arithmetic in school?
I did. 40 glideslope frequencies between 329.15MHz and 335 MHz yields
150KHz spacing, just as all the manufacturers list on their spec sheets.
Divide it out, and do get back to us with your findings. . .


All Garmin and
Honeywell and Narco equipment produced in the last 20 years or more is
certainly compliant.

I do not really doubt this - in fact it's what I expected to find.
However on reading the specific note, and looking the item up, I cannot
find any documentation to support this. On the contrary, manufacturers'
specifications do not indicate compliance. I would be delighted if you
could point me to something to prove my reading incorrect.