[Elecraft] S-meter calibration

[AB3EN]

Turn the RF gain full cw and see if the S Meter is acting normal.



Oliver Johns wrote:
> 
> Dear Wayne,
> 
> I was also puzzled by this.  After I finished the RX gain calibration  
> on the main receiver (no sub-receiver installed), the XG-2 at 50 uV  
> showed S8.  Maybe the "finish" page in the K3 Utility RX calibration  
> routine should say what the user should do now:  Which CONFIG items to  
> adjust and, if any, which ones NOT to adjust.
> 
> BTW, what should the CONFIG:SMTR MD be set to during this  
> calibration?  NOR or ABS?  Or does it matter?
> 
> 73,
> Oliver Johns
> W6ODJ
> 
> 
> On 7 Oct 2009, at 1:13 PM, Wayne Burdick wrote:
> 
>> 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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-----

Dan AB3EN
-- 
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