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:[EMAIL PROTECTED]
Sent: Wednesday, August 24, 2005 7:07 PM
To: [email protected]
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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