[R-390] WA3KEY's Motorola R-390

[Tom Bridgers]

In reading about how sensitive Norm's R-390 is, I was reminded of a conversation I had with Rich Mish several years ago.  He told me that the Motorola manufactured R-390's were the ones to get because they incorporated the latest circuit changes in the R-390's (non-A's series), and were therefore the best of the best.

 

Now the problem is Rick didn't tell me what those circuit changes were.  Anybody know if Rick's comment is on target?  If so, does anyone know what circuit changes (improvements) were made?

 

I got the feeling that Rick considers his knowledge about the improved R-390 circuits to be trade secrets.  Which I understand.  But then, there is a lot of knowledge out among the R-390 group, so maybe one or more you know what these improvements are ... and can tell the rest of us?

 

73's,

-tom