[Elecraft] K3 S9 calibration?

[Joe Subich, W4TV]

To ask the obvious question ... since the S-meter is derived 
from the DSP and the DSP/controller should know if the preamp is 
on or off, why are there not two sets of calibrations so 50 uV 
at the antenna input is S9 whether the preamp is on or off?  

73, 

   ... Joe, W4TV 
 

> -----Original Message-----
> From: elecraft-bounces at mailman.qth.net 
> [mailto:elecraft-bounces at mailman.qth.net] On Behalf Of Bill W4ZV
> Sent: Saturday, February 23, 2008 9:40 PM
> To: elecraft at mailman.qth.net
> Subject: Re: [Elecraft] K3 S9 calibration?
> 
> 
> Phil & Debbie Salas wrote:
> > 
> > I see in the Yahoo K3 User's Group that Bob Sherwood just 
> > discussed  filter performance with the K3 he has been 
> > testing.  He commented that S9 at 50uV is with the preamp 
> > off.  According to my manual, you should cal S9 at 50uV 
> > with the preamp on.  I cal'd as stated in the manual, but 
> > I wonder if this is really the right way to do this.  
> > Comments?
> > 
> > 
> 
> You can calibrate it either way.  If you normally operate 
> with preamp off as Rob does then calibrating it with premap 
> off makes sense.  If you normally operate with preamp on then 
> follow the manual.
> 
> 73,  Bill  W4ZV
> 
> -- 
> View this message in context: 
> http://www.nabble.com/K3-S9-calibration--tp15660022p15660103.html
> Sent from the Elecraft mailing list archive at Nabble.com.
> 
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