[Elecraft] S-Meter Sensitivity
Don Brown
[email protected]
Tue Jun 4 13:35:13 2002
Hi
OK here are the numbers with the K2 calibrated per the manual and a S-9 i=
ndication
K2 #1 550uV
K2 #2 370uV
K2 #3 380uV
K2 #4 540uV
K2 #4
S+40 54000uV
S+20 5400uV
S9 540uV
S5 65uV
S1 .82uV
As you can see the k2's are off by a factor of about 10 that's 20 db so I=
don't think it would hurt to bump the CAL S HI down a little into the 10=
to 15 range. Also this is at 7.100 mHz I have not done a check on other =
bands but I am sure it will vary some because the receiver gain varies fr=
om band to band. The S-meter does track fairly well as you can see from t=
he numbers. One way that will get you close is set the RF gain to 9 o'clo=
ck rather than fully counter clockwise and then do the CAL S HI. =20
Don Brown
KD5NDB
----- Original Message -----
From: [email protected]
Sent: Tuesday, June 04, 2002 10:41 AM
To: [email protected]; [email protected]
Subject: Re: [Elecraft] S-Meter Sensitivity
Hi, Don,
You wrote:
"I just checked four K2 radios I have in my lab and the CAL S HI needs to
be reduced to around 10 to 12 to get a reading of S9 with the corrected
setup above. This means the S-meter does read a little low on these
radios with the manual calibration."
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
Reducing CAL S HI by a count of 10 to 12 sounds like quite a bit.
If those four K2s had their S-meters calibrated to S9 as per the
procedure in the manual, how many uV would it take for them to read S9?
This would give us all a pretty good idea of the S-meter sensitivity of
the average K2.
I'm curious to know, with your S-meter calibrated as above, how many uV
does it take for the your S-meter to read S5, 20 over 9, and 40 over 9
(the other front panel markings for the S-meter)? Does it retain
reasonable accuracy (where S5 is approx 4 uV, 20 over 9 =3D 500 uV and 40
over 9 =3D 5000 uV)? For S5 I'm assuming that each S-unit is 6 dB (which
means a reading of S1 would require a signal 48 dB below 50 uV).
73, de Earl, K6SE
67 countries with K2 #2622 and counting.....
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