K3: New Utility: S-meter calibration

[David Pratt]

I have just completed a full recalibration of Power and the new S-meter
calibration with successful results. I am most impressive.

One query though...  Using the SG1 to generate a 1uV and 50uV signal
source on 7040kHz, after calibration I find that the S-meter reads
S9+5db with 50uV and S4 with 1uV.  This is with both the main RX and the
Sub RX.  Is that what others find?

Also, Dick, would it be possible in a future utility release, to go
straight to the Sub-RX calibration without having to do the Main RX
first?

Many thanks for an excellent program.

73
--
David G4DMP
Leeds, England, UK
------


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[chen dave]

I don't think most of us need this function. Mine K3 S meter is good enough.
See the following table for my K3:
 uV S meter
 dBm(from) S meter dBm(to) 50 S9
 -77 S9 -72 25 S8
 -71 S9+5 -67 12 S7
 -66 S9+10 -63 6 S6
 -62 S9+15 -58 3 S5
 -57 S9+20 -55 2 S4
 -54 S9+25 -53 1 S3
 -52 S9+30 -48 0.9 S3
 -47 S9+35 -42 0.8 S3
 -44 S9+40 -41 0.7 S3
 -40 S9+45 -37 0.6 S2
 -36 S9+50 -34 0.5 S2
 -33 S9+55
 0.4 S2
 -32 S9+60
 0.3 S1



 0.2 S1



 0.15 S1



 0.1 S0






73 DE BA4RF/David

On Thu, Aug 13, 2009 at 8:07 PM, David Pratt <[hidden email]>wrote:

> I have just completed a full recalibration of Power and the new S-meter
> calibration with successful results. I am most impressive.
>
> One query though...  Using the SG1 to generate a 1uV and 50uV signal
> source on 7040kHz, after calibration I find that the S-meter reads
> S9+5db with 50uV and S4 with 1uV.  This is with both the main RX and the
> Sub RX.  Is that what others find?
>
> Also, Dick, would it be possible in a future utility release, to go
> straight to the Sub-RX calibration without having to do the Main RX
> first?
>
> Many thanks for an excellent program.
>
> 73
> --
> David G4DMP
> Leeds, England, UK
> ------
>
>
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
>

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[KK7P]

> One query though...  Using the SG1 to generate a 1uV and 50uV signal
> source on 7040kHz, after calibration I find that the S-meter reads
> S9+5db with 50uV and S4 with 1uV.  This is with both the main RX and the
> Sub RX.  Is that what others find?

This is not uncommon.  The calibration is currently the decision point,
so reducing the signal 1 dB or less would move it down on the S Meter
display.

> Also, Dick, would it be possible in a future utility release, to go
> straight to the Sub-RX calibration without having to do the Main RX
> first?

Just click Next and skip through the main calibration.  You don't have
to do it.

73,

Lyle KK7P

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[Dick Dievendorff]

As Lyle has indicated, you may click "next" through the main receiver
calibration page without clicking its "calibrate" button and advanced to and
calibrate only the sub receiver.

We're always torn in these dialogs between putting too much text on a page
and too little.

In general, if step A is REQUIRED before step B, I'll make it difficult to
do B without having first done A.  For example, if the K3 Utility required
main calibration before sub calibration, I would have disabled the calibrate
button on the sub receiver page.

I'll add something to K3 Utility Help, though...

Dick, K6KR
 

-----Original Message-----
From: [hidden email]
[mailto:[hidden email]] On Behalf Of David Pratt
Sent: Thursday, August 13, 2009 5:07 AM
To: Elecraft Reflector
Subject: [Elecraft] K3: New Utility: S-meter calibration

I have just completed a full recalibration of Power and the new S-meter
calibration with successful results. I am most impressive.

One query though...  Using the SG1 to generate a 1uV and 50uV signal
source on 7040kHz, after calibration I find that the S-meter reads
S9+5db with 50uV and S4 with 1uV.  This is with both the main RX and the
Sub RX.  Is that what others find?

Also, Dick, would it be possible in a future utility release, to go
straight to the Sub-RX calibration without having to do the Main RX
first?

Many thanks for an excellent program.

73
--
David G4DMP
Leeds, England, UK
------


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[ab2tc]

I am sometimes finding it will read 1 bar above what it should, which is what you are seeing. But using the AT1 step attenuator, I find that it takes only 1 or 2 dB attenuation to bring the reading down one bar. This now one heck of an accurate S meter. I now have within a couple of dB at the S3, S9 and s9+40 calibration points that I can do without fiddling with the attenuator.

ab2tc - KNut

David Pratt-4 wrote

I have just completed a full recalibration of Power and the new S-meter
calibration with successful results. I am most impressive.

One query though...  Using the SG1 to generate a 1uV and 50uV signal
source on 7040kHz, after calibration I find that the S-meter reads
S9+5db with 50uV and S4 with 1uV.  This is with both the main RX and the
Sub RX.  Is that what others find?
<snip>