[R-390] FS: R-390 Small leftover parts.

[Bob Camp]

Hi

The only significant documented difference is that the 390 not an A has 
L-C filtering in the IF. Some people simply think this sounds better 
than a mechanical filter. Since the R-390 (either one) is not exactly a 
hi-fi set it's not very clear weather it's worth the trouble.

Since the not an A's are a bit harder to find that the 390A there is 
the issue of soaking up the available spare parts for a rare item to 
fiddle an item that is not so rare. Opinions on this kind of thing 
differ. Obviously this would not have even been worth mentioning twenty 
years ago when the not an A was a "dog" and the 390A was the only radio 
worth the $100 asking price at the local flea market.

There are some differences in the AGC between the two radios and a 
couple of equally minor changes in the IF strip. It is unlikely anybody 
would consider them in making a conversion.

This all assumes you are using just one radio. If you are trying to set 
up a dual radio DF setup then the mechanical filters are definitely not 
a good idea. They have more phase ripple in the passband that the LC 
filters. That will mess up your bearings ...

	Take Care!

		Bob Camp
		KB8TQ


On Feb 12, 2005, at 3:35 PM, Dan Arney wrote:

> Would someone in the know the PROS and CONS on installing a R-390 IF 
> deck in a R-390A. Is it worth the time and effort. etc. etc. etc.
> TIA
> Hank
> KN6DI
>