What is the difference between an IFR 1000S and an IFR 1100S service monitor? 

 I know that they were sold to the military as the AN/GRM-114 and AN/GRM-114A 
but what is the difference between the two. The reason I ask is that I can't 
find a manual for the 1100S but sort of have for the 1000S----lousy CD with 
unreadable schematics---but it looks to be pretty much on track for the 1100S. 

And while we are on the subject---I'd like to hear your comments concerning 
these units.

Thanks---

Scott, N6NXI

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