[R-390] OT: Other Radios You Like

[Cecil Acuff]

Interesting Andy.  10 khz spacing is quite demanding.  There are so many 
variables.  I can't imagine if all were set to a common bandwidth for 
testing that performance would not be close to the same.  I know the SDR's 
have great flexibility in setting the bandwidth....I guess it all depends on 
how many buttons and knobs one has at his disposal to dial up a solution. 
No doubt the 390A has few but I would have expected better out of the 
tracking preselecting front end....  Which antenna connector do you use the 
balanced or unbalanced.  The unbalanced is a compromise because it skips 
part of the front end tuning.

10Khz is still a pretty stiff requirement....but I've seen my (now Les 
Locklears) Leary SP-600 slice and dice with the best of them.

Cecil
----- Original Message ----- 
From: "Masters Andy" <nu5o at yahoo.com>
To: <r-390 at mailman.qth.net>
Sent: Monday, February 25, 2008 11:55 AM
Subject: [R-390] OT: Other Radios You Like


> Tim raises a good point about his WJ.  I have
> thoroughly enjoyed this discussion because I always
> wondered about a lot of the radios mentioned.
>
> Where I live, near Memphis, TN, I have an acid test
> that I use to evaluate selectivity.  We have a local
> high power AM station on 640 Khz (WCRV), I take the
> radio and then tune it to 650 Khz (WSM in Nashville,
> TN).  If I can hear WSM and NOT hear WCRV, the radio
> is good.  WCRV watches its modulation and is a good
> test.  My R390A did not pass the test but a 651S-1 and
> the new Flex-Radio I have tried did so with flying
> colors.  Others to fail were the IC-75A with the Kiwa
> mods, a 51S-1, IC-756PRO II/III and my old
> Sparton-although the Sparton with its loop antenna
> built in was able to reject 640KHZ by simply turning
> it to null the local station.  When flying WSM used to
> be a clear channel station and we could use them as a
> NDB from hundreds of miles out to thousands of miles
> depending on time of day.
>
> My other test is purely subjective and that is the
> sound of the audio.  My R390A  has the Kleronomos
> audio mod and the audio sounds fantastic out of it.
> The Sparton has been modified to a single ended 6V6
> biased in class A and it has the edge on sound.
>
> I figure you guys have collectively saved me $1000's
> on what I always wondered about.  THANKS!
>
> Andy Masters NU5O/P29AM/7Q7AM
>
>
>
> 
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