[R-390] HSR-2 vs 390a

[Roy Morgan]

At 09:32 AM 1/27/04 -0800, Dan Merz wrote:
>  ...  Electric Radio,  Jan 2004 issue having to do with performance of
>an apparently pretty simple homebrew receiver vs. R-390a.  ...
>"Comparison to my very well working 390a was dramatic,  I could CLEARLY
>hear signals that were well under the hash level of the 390a, but very
>comfortable copy on the homebrew receiver."
>... are there other factors that would make the 390a inferior in
>certain cases to a simple receiver as expounded in this article?

Dan,

Almost certainly his IF gain is set too high, and/or his first rf amplifier 
tube is noisy.  The noise contributed by the front end of a properly 
working R-390A is very likely way below the QRM and QRN of the 40 meter 
band.  If his home brewed radio gives him less noise than the R-390A, then 
the R-390A needs attention.

Roy

- Roy Morgan, K1LKY since 1959 - Keep 'em Glowing!
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