[R-390] R390 VS 390A

[Ray, W2EC]

Hi Xu,

I agree with Barry's comments on the filters based on my own
side-by-side comparisons. My personal preference in audio is the R-390
(R-391 in my case).

I use the CV-591 with both my R-391 (basically R390 equivalent) and
R-390A's. Also use it with the SP-600. 

Ray

Barry Hauser wrote:
> 
> Hi Xu:
> 
> You wrote:
> >  I know that R390 is better than R390A,but the R390A with mechanical
> > fiter,I think the R390A have better selectivity than R390,is that right?
> 
> Actually, it's more of a yin-yang situation.  The non-A (yin) has LC
> filtering, generally equivalent selectivity, but with smooth rolloff -- not
> as steep of course, but better for audio quality.  The R-390A has steep
> skirts with the mech. filters, but sometimes there is ringing and lately,
> there seems to be a higher failure rate of the filters (as they age?).
> Better for SSB, but not as good for sound quality, hence designated "yang".
> 
> > and R390 can match CV591,Does V591 can match with R390?
> 
> I believe both A and non-A work with the CV-591 and the older, bigger SSB
> converter (CV-157?).
> 
> >where can I find a homemade SSB adaptor for R390?
> 
> You can get a solid state SSB converter, the PD-1 from Ron Hankins.
> Unfortunately, the links/URL's I have for him are not working.  About $100
> as I recall.
> 
> For homebrew and mods, take a look at
> http://www.r-390a.net/SSB-conversion.pdf
> 
> Hope this helps.
> 
> Barry
> 
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