[Elecraft] [K3] Sub RX S-meter cal

[Wayne Burdick]

Mike,

Now that you've done rf gain cal, you'll still need to adjust SMTR OF  
& SC so that you get S9 with 50 uV and S2-3 with 1 uV. RF gain cal  
linearizes the dsp's internal representation, while SMTR OF & SC set  
the actual meter indication.

Try the factory defaults first.

73,
Wayne

----
http://www.elecraft.com

On Oct 7, 2009, at 10:59 AM, "Mike Harris" <mike.harris at cwimail.fk>  
wrote:

> G'day,
>
> My results are:
>
> Source - XG1, RX gain calibration per the utility routine:
>
> Subsequently:
>
> Main RX only, pre amp OFF  - 50uV (S9), 1uV (S2)
>
> Sub-RX ON therefore splitter loss:
>
> Main RX S8 & S1
> Sub-RX  S7 & S0
>
> No big deal but not identical.
>
> As a matter of interest, the S-meter on the main RX had been set up
> a year ago or more as above.  When I checked it before doing the RX
> gain calibration I discovered that the 1uV and 50uV figures were S5
> & S9.  Little wonder I thought the local noise level had been
> creeping up!  Maybe after playing with the AGC parameters a re-cal
> of the S-meter is required, maybe not, but something altered it.  I
> assume that given the 50uV S9 setting was correct then it isn't
> associated with the XG1.
>
> Regards,
>
> Mike VP8NO
>
>
> ----- Original Message -----
> From: "Ken K3IU" <kenk3iu at cox.net>
> To: "N1JM" <johnn1jm at gmail.com>
> Cc: <elecraft at mailman.qth.net>
> Sent: Wednesday, October 07, 2009 12:22 PM
> Subject: Re: [Elecraft] [K3] Sub RX S-meter cal
>
>
>> The S-meter Cal procedure in the manual worked up until about
>> v.3.15 or
>> so. Now I am pretty sure that it was NOT separately adjusting the
>> SubRx
>> S-meter, but I never checked, so I'm not sure. It doesn't really
>> matter now.
>>
>> I have determined that, at least on my K3 (#202) running v3.41 et
>> al,
>> after running the RF Gain Calibration procedure and setting the
>> MAIN Rx
>> S-meter, the Sub Rx S-meter is spot on. It actually follows the
>> adjustment for the Main Rx S-meter, i.e., set Main Rx at an
>> extreme and
>> the Sub Rx shows the exact same extreme.
>>
>> So... it looks to me like there is no reason to have a separate
>> adjustment for the SubRx S-meter. I'm sure the manual will catch
>> up.
>>
>> 73,
>> Ken K3IU
>
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