[Elecraft] Width of AM filter

[KM5Q]

For those who wish to listen AM/SW broadcast, researching the  
Reflector is required to find out that the "FM" filter is the way to go.

I suggest an addition to the 13 kHz filter product description, and  
other discussions of filter choice, to say that it is also recommended  
for full-bandwidth AM reception. That will help prevent people from  
ordering the AM filter on the wrong assumption.

Windy KM5Q