[Milsurplus] R-390 vs R-390A

[mikea]

On Sat, May 10, 2003 at 08:39:34PM -0500, aGEnuine Ham wrote:
> Bruce:
> 
> I'm surprised you don't have a dozen answers by now.  The earlier 390 had
> standard LC selective circuits, and therefore a smoother phase response
> across the passband.  On the other hand, replacing the mechanical filters
> in the A will help that a lot, and the synchronous detector is always a
                                     ^^^ ^^^^^^^^^^^ ^^^^^^^^
> better choice for SSB detection.  My last info is that BBC is still AM,
> while the airways comms are SSB.  You really need one of each, when you
> get right down to it.  On either of them, you need to do one of the
> better audio mods to get the best quality audio out of it anyway.

What synchronous detector? I have one non-A and 4 A, and none of them
has a synchronous detector. 

For good audio, any of the rigs puts out _nice_ audio across the 
Diode Load terminals.

-- 
Mike Andrews
mikea@mikea.ath.cx
Tired old sysadmin since 1964