K3 S Meter

[Dave, G4AON]

Regarding the comments to alter the scale settings for the S-Meter, all
I can say is that with the current firmware (MCU firmware 1.66) and the
suggested default settings, the K3 S-Meter is the most accurate I've
ever measured.

For S9 at -73 dBm (50 uV PD), S9 +20 occurs at -53 dBm, + 40 at -33 dBm
and +60 at -13 dBm. It isn't quite so good below about S6 or S7, but
heck it's not broken so lets not try to fix it!

73 Dave, G4AON
K3/100 #80

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[N8LP]

I spent quite a bit of time back and forth with support over the S-Meter
the last two days. They are working on some changes to the S-meter,
which will include another CONFIG parameter. Stay tuned for details from
the factory.

73,
Larry N8LP

> Date: Fri, 1 Feb 2008 19:36:41 -0800 (PST)
> From: Don Rasmussen <[hidden email]>
> Subject: [Elecraft] K3 S Meter
> To: [hidden email]
> Message-ID: <[hidden email]>
> Content-Type: text/plain; charset=iso-8859-1
>
> I have never given an S-meter reading in 30 years of
> hamming, it does not mean anything. But I do enjoy
> seeing the S-meter move through it's full range, it
> allows a good visual gauge of QSB.
>
> The K3 meter scale is bunched up on the left side of
> the range, having less physical distance for S0 to S9
> as for S9 + 10 to S9 +60. So the right half of the
> scale is pretty much wasted for me with respect to the
> S-meter display.  
>
> We need a little more range in the SMTR SC CONFIG, but
> if you take that to minimum (10) and set SMTR OF to
> (22), the meter is laid out more like an OMNI VI meter
> where the majority of the display is devoted to S1 to
> S9 + 10.
>
> Looking at the more darkened markings on the meter
> face, the first mark rates about S3, the next S5, then
> S7, S9 would be where the +40 indicator is, and full
> scale would be S9 + 10db.
>
> I've requested a little more range on the SMTR SC to
> come down to possibly 5 rather than the present
> minimum of 10 to allow a better resting value on the S
> meter but that went into the pile of "cosmetics",
> somehow less important than coding for the upcoming
> SubRX.  ;-)
>
> Of course I agree with that 100%.
>
> I also agree that some purists will be offended by the
> idea of an uncalibrated S-meter but please - the
> subject has been beat to death so please flame me in
> private if you feel the need to vent. Or read the
> archives, it's still all there. !!!
>
> de wb8yqj ..
>
>
> ------------------

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[Craig Smith]

While we are on the subject of the S meter, I'd like the status of a topic
that was discussed several months ago before the actual availability of the
radio.  The question was whether the S meter would indicate the actual
signal voltage at the input to the rig or whether it would be dependent on
the preamp and/or attenuator settings.  There was some agreement that
ideally the user could select the mode of S meter operation that he/she
desired.  Can someone tell me if the current firmware supports this
flexibility?

    Thanks and 73
                           ... Craig  AC0DS




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