[R-390] Preselector
JMILLER1706 at cfl.rr.com
JMILLER1706 at cfl.rr.com
Thu Aug 19 09:25:58 EDT 2004
The entire front end of a 390 is in essence one very high performance tuned preselector, and probably does the preselection function very well by itself. So unless you have a particularly strong interfering signal in an adjacent band needing additional attenuation, I couldn't see another preselector as helping. If you have a less than optimum antenna, the preamplification (or maybe an active antenna) could help overcome antenna loss, but you also run the risk of overloading the 390 front end, although this is unlikely. Sensitivity at the high bands might be improved with a pre-amp. I have also heard that 390a's have a slight droop in sensitivity in the 7 Mc range, so there might be some improvement there. But in general I would think it would be like hitching a self-propelled mower in front of a Mac truck to improve its pulling torque.
----- Original Message -----
From: Charles B <ka4prf at us-it.net>
Date: Thursday, August 19, 2004 5:04 am
Subject: [R-390] Preselector
> Hi all,
>
> What happens if you install a small preselector or
> preamplifier in front of an R-390A? Does it help or hinder?
>
> Chuck
> ka4prf at us-it.net
>
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