[R-390] Best approach for SSB mod on R-390A

[ANTHONY CASORSO]

One other thing I forgot to mention is that the mod makes the carrier meter respond in a more useful way (IMHO) to SSB signals.

 

Tony
 
> From: canthony15 at msn.com
> To: drewrailleur807 at yahoo.com; r-390 at mailman.qth.net
> Date: Tue, 22 Dec 2009 21:32:41 -0700
> Subject: Re: [R-390] Best approach for SSB mod on R-390A
> 
> 
> I use the diode mod as well and I think it works very well too. The article I read also said to parallel a few more PF with the injection capacitor which I also did. Without this, you may still find yourself backing down the RF gain to get rid of the distortion on the really strong signals.
> 
> 
> 
> I also suggest that you avoid 1n4148 or 1n914 for the diodes. You need something with a higher PIV rating. I blew one of the diodes within a few days before I was advised of this issue by someone on this list. I switched to some different diodes and it hasn't hiccupped since.
> 
> 
> 
> Tony Casorso
> 
> > Date: Tue, 22 Dec 2009 19:49:41 -0800
> > From: drewrailleur807 at yahoo.com
> > To: r-390 at mailman.qth.net
> > Subject: Re: [R-390] Best approach for SSB mod on R-390A
> > 
> > 
> > Tom Frobase wrote:
> > 
> > "What is the suggested approach for SSB modification for the R-390A.
> > 
> > Is the 2 diode modification worth attempting? I know it has been
> > covered here more than once just wanted to solicit the current thinking
> > on the matter ... thank you ... tom, N3LLL "
> > 
> > I performed the 2 diode mod and I would characterize the results as a night-and-day difference over stock. It is extremely simple to perform and gets you probably about 90% of the desired result with less than 5% of the effort. Give it a try, it is just as easy to undo if you are not satisfied.
> > 
> > Drew
> > 
> > 
> > 
> > 
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