[Elecraft] S-meter calibration

[Wayne Burdick]

We're going to add a final instruction to K3 Utility explaining that  
SMTR OF and SC must be adjusted after running RF GAIN calibration. I  
suggest doing this with SMTR MD = ABS, preamp ON. Under these  
conditions you should be able to set SMTR OF and SC such that 50 uV  
produces an S9 reading, and 1 uV results in S2 to S3.

Having verified this, you can if desired set SMTR MD to ABS, which is  
independent of the preamp and attenuator settings. The OF and SC  
values may need further tweaking in this case.

Regarding SMTR MD: It can be set to either ABS or NOR at the time the  
RF GAIN cal procedure is run. The menu S-meter settings have no  
bearing on the DSP's internal calibration process. They are only used  
to set up the S-meter readings per the user's preference.

I'm verifying this with Lyle and will get back to you if I'm wrong :)   
Lyle is on vacation and a bit hard to ready.

73,
Wayne
N6KR

On Oct 7, 2009, at 1:51 PM, O. 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