KX1 S meter calibration

[Mike and Alicia Fanning]

I'm trying to calibrate the S meter on my newly finished KX1 by cheating and
using a good signal generator at work during my lunch break.  The KX1 manual
suggests using another receiver tuned to a strong (S9+20 dB) signal as the
"reference standard", and then setting the KX1 S meter to full scale (6
bars) using this same signal as a reference.  What level should I set my sig
gen to to generate an S9+20 dB signal level?  I realize it's a relative
thing, but I don't want to put too much signal into the radio and burn up
the front end.

Thanks!
Mike, K4GU
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[Howard W. Ashcraft]

I believe the S9 "standard" is 50 millivolts, which is 50 microwatts at
50 ohms  [v**/50], which is -13 dbm [10*log(50uw/1mw)].  So, I would say
that +7 dbm would be your level.   As always, check the math and the
logic.  (I'm sure someone on the reflector will spot an error.)  

-----Original Message-----
From: Mike and Alicia Fanning [mailto:[hidden email]]
Sent: Wednesday, August 24, 2005 7:07 PM
To: [hidden email]
Subject: [Elecraft] KX1 S meter calibration

I'm trying to calibrate the S meter on my newly finished KX1 by cheating
and using a good signal generator at work during my lunch break.  The
KX1 manual suggests using another receiver tuned to a strong (S9+20 dB)
signal as the "reference standard", and then setting the KX1 S meter to
full scale (6
bars) using this same signal as a reference.  What level should I set my
sig gen to to generate an S9+20 dB signal level?  I realize it's a
relative thing, but I don't want to put too much signal into the radio
and burn up the front end.

Thanks!
Mike, K4GU





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[Graham Haddock]

Howard:

I believe that the "S9 Standard" is 50 microvolts, not 50 millivolts.

So your math is correct other than a six order of magnitude error.   :-)
But whats a few orders of magnitude among friends?

S9   equals   50 microvolts across 50 ohms   equals   -73 dBm

Mike should be able to take it from there.

ARRL members can read:
http://www.arrl.org/tis/info/pdf/0408032.pdf

--- Graham

==



Howard W. Ashcraft wrote:

>I believe the S9 "standard" is 50 millivolts, which is 50 microwatts at
>50 ohms  [v**/50], which is -13 dbm [10*log(50uw/1mw)].  So, I would say
>that +7 dbm would be your level.   As always, check the math and the
>logic.  (I'm sure someone on the reflector will spot an error.)  
>
>-----Original Message-----
>From: Mike and Alicia Fanning [mailto:[hidden email]]
>Sent: Wednesday, August 24, 2005 7:07 PM
>To: [hidden email]
>Subject: [Elecraft] KX1 S meter calibration
>
>I'm trying to calibrate the S meter on my newly finished KX1 by cheating
>and using a good signal generator at work during my lunch break.  The
>KX1 manual suggests using another receiver tuned to a strong (S9+20 dB)
>signal as the "reference standard", and then setting the KX1 S meter to
>full scale (6
>bars) using this same signal as a reference.  What level should I set my
>sig gen to to generate an S9+20 dB signal level?  I realize it's a
>relative thing, but I don't want to put too much signal into the radio
>and burn up the front end.
>
>Thanks!
>Mike, K4GU
>
>
>
>
>
>*****************************
>This communication, including any attachments, is confidential and may be protected by privilege.  If you are not the intended recipient, any use, dissemination, distribution, or copying of this communication is strictly prohibited.  If you have received this communication in error, please immediately notify the sender by telephone or email, and permanently delete all copies, electronic or other, you may have.
>
>To ensure compliance with requirements imposed by the IRS, we inform you that any tax advice contained in this communication (including any attachments) was not intended or written to be used, and cannot be used, for the purpose of (i) avoiding penalties under the Internal Revenue Code or (ii) promoting, marketing or recommending to another party any transaction or matter addressed herein.
>
>The foregoing applies even if this notice is imbedded in a message that is forwarded or attached.
>*****************************
>
>
>_______________________________________________
>Elecraft mailing list
>Post to: [hidden email]
>You must be a subscriber to post to the list.
>Subscriber Info (Addr. Change, sub, unsub etc.):
> http://mailman.qth.net/mailman/listinfo/elecraft   
>
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>Elecraft web page: http://www.elecraft.com
>
>
>  
>

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