Stephen,
The broadcast-band preselector components on the ATU option do in fact
optimize receive performance in the 0.5-1.5 MHz range. However, the
criteria being optimized by the preselector is rejection of harmonic
images (typical of a zero-I.F. receiver), not necessarily sensitivity.
As I posted to the reflector in March of this year (and on other
occasions), the KX3 includes a multi-pole high-pass characteristic
within the T/R switch to attenuate mega-size BC band stations below
1.5 MHz that might affect RF switches and PIN diodes. This is also
noted in the Specifications section of the manual, under "Sensitivity
(MDS)".
I see that the KX3 sales brochure isn't clear on this point, and I'll
fix that.
One thing I can do in firmware is allow the user to manually tune the
ATU's LC network to peak a given AM-band signal. I'll eventually add
this as an alternative to the "canned" preselector settings, which
were based on a compromise antenna (50' center-fed random wire).
73,
Wayne
N6KR
Stephen Prior wrote:
> Hi Wayne
>
>
> Have things changed then, since you wrote the following back last
> October?
>
>
>
> "- switchable low-pass filter components that optimize receive
> performance when you're listening in the AM broadcast band"
>
>
> I'm just wondering, because I too enjoy a bit of medium wave late at
> night when camping. It's no big deal of course!
>
> 73 Stephen G4SJP
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