[R-390] Attribution

[R390rcvr@aol.com]

I forgot to mention that much of my detailed info on when various changes 
were made in the R-390A series, has come from Tom Marcotte, N5OFF. He has 
generously shared his data. Other pieces have been gleaned from nice folks 
off the list who have sent in details about their rigs.

One of the things I hope the "spotters guide" will help with is buying a rig 
long distance. Most of the sellers don't now the subtleties of different 
versions, can't tell a Collins from a Capehart, and just go by the tag, if 
there is one. Its nice to be able to do some basic identification from 
photos. Even the simple things like # of fuses, dimple in the mechanical 
filter cover, etc., helps pin it down. 

Thanks to everyone who has contributed time and information.

Randy Stout