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

[ANTHONY CASORSO]

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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