[R-390] R-390A sensitivity measurements

[Cecil Acuff]

I believe antenna tuners fool your radio by presenting a controlled 
impedance thus making solid state transmitters happy but they don't make 
your antenna system any more efficient.  My guess is that received signal 
strengths with the antenna tuner in line and tuned are probably the same or 
maybe even lower as without the antenna tuner and antenna directly connected 
in an accepted manner and radio trimmer peaked.

Just a guess....haven't tried it....yet!

Cecil...
----- Original Message ----- 
From: <DJED1 at aol.com>
To: <tetrode at comcast.net>; <r-390 at mailman.qth.net>
Sent: Friday, March 04, 2005 11:39 AM
Subject: Re: [R-390] R-390A sensitivity measurements


>I agree with John about not aligning the radio to the antenna- too much
> variation in impedance over the band.   I use an antenna tuner on my wire 
> antenna
> and logged the settings for each frequency of interest using an MFJ 
> antenna
> analyzer.   The tuner settings show a LOT of antenna impedance variation,
> especially below 4 MHz.   Of course, the radio is now looking into 50 
> ohms, but it's
> close enough for Guvm't work.   Certainly, for those of us in noisy 
> suburban
> locations, a tuned antenna provides a high enough noise level that I don't
> worry about that last 0.5 dB of sensitivity.   That's what I did today- 
> put the
> signal generators away and tuned up the radio to some interesting SWBC.
> Ed
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