From my "chart on the wall", at 50 ohms, 4 mV is about -34.8 dBm and
50 uV is -73 dBm. Thus you will need an attenuator supplying some ~35
dB of loss.
From your numbers and starting at 40 mv {-14.8 dBm}, using 3
attenuators of 20 dB each will get "close".As someone else suggested
the
Doug,
That may work as long as the signal generator and the attenuators are
very well shielded.
If the brand name were Agilent (used to be HP), I would say that it
would be well shielded, but I don't know about a product from the "Siglent".
You may do better to invest in the Elecraft XG3. Th
I have access to signal generator similar to this (
http://www.circuitspecialists.com/sdg830.html), but its minimum output is
4mv. The calibration calls for 50uV of signal.
It looks like I could set the output to 40mv (I don't like working at the
bottom of the range), and then attenuate the output
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No downside at all. The "upside" is that you understand how you set
it and can then read it intelligibly.
If you have the preamp on, you know it will read about 2 S units higher,
and if you have the attenuator on it will read 1 1/2 to 2 S-units lower
- that is unless you have set ABS mode on,
On Wed, Apr 20, 2011 at 11:46 PM, Don Wilhelm wrote:
> Bill,
>
> I agree, and I am glad to see that the K3 has included ABS mode for the
> S-meter.
> If you are using ABS mode, calibrate the S-meter with the preamp off. If
> you are using NOR, then do as the manual says and calibrate it with the
Bill,
I agree, and I am glad to see that the K3 has included ABS mode for the
S-meter.
If you are using ABS mode, calibrate the S-meter with the preamp off.
If you are using NOR, then do as the manual says and calibrate it with
the preamp ON.
OTOH, if you are more interested in the bands wh
Sent: Wednesday, April 20, 2011 2:59 PM
To: elecraft@mailman.qth.net
Subject: [Elecraft] S-Meter Calibration
Hello:
Is it just my unit or did your K3/100 from the factory assembled have
the S-Meter way off in terms of calibration? I have #4854 which was
assembled from the factory and the S-Mete
On Wed, Apr 20, 2011 at 2:58 PM, Alexander Sack wrote:
> Hello:
>
> Is it just my unit or did your K3/100 from the factory assembled have
> the S-Meter way off in terms of calibration? I have #4854 which was
> assembled from the factory and the S-Meter was WAY OFF. I mean 50uV
> was reading S3.
Hello:
Is it just my unit or did your K3/100 from the factory assembled have
the S-Meter way off in terms of calibration? I have #4854 which was
assembled from the factory and the S-Meter was WAY OFF. I mean 50uV
was reading S3. With my Elmer's scope and the nice tuning directions
in the manual
-3B
-Original Message-
From: elecraft-boun...@mailman.qth.net
[mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Wayne Burdick
Sent: Wednesday, October 07, 2009 9:28 PM
To: Wayne Burdick
Cc: Elecraft@mailman.qth.net
Subject: Re: [Elecraft] S-meter calibration
Typo. I meant to say SMTR
Typo. I meant to say SMTR NOR in the paragraph below.
Wayne
Wayne Burdick wrote:
> We're going to add a final instruction to K3 Utility explaining that
> SMTR OF and SC must be adjusted after running RF GAIN calibration. I
> suggest doing this with SMTR MD = ABS, preamp ON. Under these
> conditi
> I'm verifying this with Lyle and will get back to you if I'm wrong :)
> Lyle is on vacation and a bit hard to reach.
Lyle believes this is correct, too!
73,
Lyle KK7P/7 (in Cottonwood, AZ)
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We're going to add a final instruction to K3 Utility explaining that
SMTR OF and SC must be adjusted after running RF GAIN calibration. I
suggest doing this with SMTR MD = ABS, preamp ON. Under these
conditions you should be able to set SMTR OF and SC such that 50 uV
produces an S9 reading,
Turn the RF gain full cw and see if the S Meter is acting normal.
Oliver Johns wrote:
>
> Dear Wayne,
>
> I was also puzzled by this. After I finished the RX gain calibration
> on the main receiver (no sub-receiver installed), the XG-2 at 50 uV
> showed S8. Maybe the "finish" page in th
Dear Wayne,
I was also puzzled by this. After I finished the RX gain calibration
on the main receiver (no sub-receiver installed), the XG-2 at 50 uV
showed S8. Maybe the "finish" page in the K3 Utility RX calibration
routine should say what the user should do now: Which CONFIG items to
Well anyway this is how I like it...and i'll leave it alone
with pre amp off 50mv = s9
with pre amp on50mv = 10/s9
K7WIA wrote:
>
> when calibrating the S meter, the manual says to have the pre-amp on, SMTR
> MD to Relative (NOR)
> I find that I can't even get close.
> with the pre-amp of
I have it set up just like you have but with the pre amp on the meter
measures way to high and to get it set I am way off on SMTR SC & SMTR OF
Ed Muns, W0YK wrote:
>
>> when calibrating the S meter, the manual says to have the
>> pre-amp on, SMTR MD to Relative (NOR) I find that I can't
>> e
> when calibrating the S meter, the manual says to have the
> pre-amp on, SMTR MD to Relative (NOR) I find that I can't
> even get close.
> with the pre-amp off it fall right into spec. as per the
> manual, with the SMTR MD set to Nor I am using the XG2, and
> receiving on 20 mtrs.
> with SMTR
when calibrating the S meter, the manual says to have the pre-amp on, SMTR MD
to Relative (NOR)
I find that I can't even get close.
with the pre-amp off it fall right into spec. as per the manual, with the
SMTR MD set to Nor
I am using the XG2, and receiving on 20 mtrs.
with SMTR MD set to Abs a
From: "Joe Subich, W4TV" <[EMAIL PROTECTED]>
To: "'Mike Harris'" <[EMAIL PROTECTED]>;
Sent: Wednesday, November 19, 2008 7:14 PM
Subject: RE: [Elecraft] S-meter calibration
|
| 1) calibrate the subreceiver S-meter using the BNC (AUX) antenna
| instead of
t; To: Elecraft@mailman.qth.net
> Subject: [Elecraft] S-meter calibration
>
>
> G'day,
>
> I have been trying to perform the Sub-RX S-meter calibration
> and find that
> following the procedure in the owners manual (D1 p50) doesn't
> work, at
> least for m
G'day,
I have been trying to perform the Sub-RX S-meter calibration and find that
following the procedure in the owners manual (D1 p50) doesn't work, at
least for me. There is no way I can display the Sub-RX S-meter reading
and enter the Config menu options required to calibrate the Sub-RX. T
hi Don,
Don Wilhelm schrieb am 28 Nov 2007 um 9:17:
> Switch the antenna on and off to tell
> how much atmospheric noise is present - if the receiver noise level
> increases when the antenna is connected, then the atmospheric noise is
> higher than the receiver noise floor and more preamp gain
Werner,
There is no 'correct' answer, each operator can make his own choice on that.
I usually set the S-meter on 40 meters with a 50 uV signal and the
preamp off. Other bands may vary somewhat, but this seems to give me
the most consistent behavior. Note that I usually operate with the
prea
hello all,
I have a question regarding s-meter calibration. When I feed the 50µV signal
into the K2, do I have to switch the preamp on or off for a correct S9
reading?
This was the only question left after reading this:
http://www.mail-archive.com/elecraft@mailman.qth.net/msg08561.html
73! de We
Hi guys,
It seems that my S Meter calibration is changing. I noticed this when I
was building the K2 and it seems to happen occasionally. What usually
occurs is when I take the RF gain all the way counter clockwise, the
last LED does not light up. I readjust it so that it does. It should
Folks,
I would add to what Ron said that the AGC Threshold setting also has a great
influence on the S-meter.
It is possible to 'twiddle' with the AGC Threshold pot, CAL S Lo and CAL S
Hi settings to obtain most any S-meter reading you want.
CAL S Hi alone can be adjusted to produce the S-9 at 5
A GR-1390B is a noise generator. It seems to sell for a few hundred US
dollars on the 'net. Still, I believe it's only good to about 5 MHz, so it's
of limited us with HF gear. Yes, you should be able to use it to 'calibrate'
the S-meter on your K2, as long as you realize that the "calibration", no
Hi Elecrafters,
I've been given some old instruments, among them a GR1390-B random noise
generator :
- Maybe it could be of some help for S-meter calibration of my K2?
- Or for something else in the radio field ?
72,
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