Bill, the K3s dBv and AF Mv meters are true RMS. We added that feature for
automated MDS testing in K3 production.
73,
Eric
www.elecraft.com
_..._
On Jan 27, 2011, at 11:17 AM, Bill W4ZV btipp...@alum.mit.edu wrote:
Arie Kleingeld PA3A-2 wrote:
I have no lab equipment but I have a
Hello all,
Did some measurements on the different frimware versions. This time not
a BW-plot but I measured S+N/N ratio's.
I have no lab equipment but I have a K3 with dBV measurements, XG2 and
the stepped attenuator from elecraft.
I measured the difference of the K3 dBV-reading in signal
All,
where I mentioned Dual PB, I mean ofcourse the APF, because that the
discussion here.
Sorry If that is not clear.
73
Arie PA3A
Op 27-1-2011 12:44, Arie Kleingeld PA3A schreef:
Hello all,
Did some measurements on the different frimware versions. This time not
a BW-plot but I measured
Arie Kleingeld PA3A-2 wrote:
I have no lab equipment but I have a K3 with dBV measurements, XG2 and
the stepped attenuator from elecraft.
Arie I believe you may have some measurement error. I'm sure you know that
noise can only be measured correctly with a True RMS responding
Page 36 of the K3 owner's manual:
AFV shows the true RMS value of receiver AF output (mVp-p), unaffected by AF
GAIN control.
73,
Scott K9MA
On Jan 27, 2011, at 1:17 PM, Bill W4ZV wrote:
I'm sure you know that
noise can only be measured correctly with a True RMS responding
...@xs4all.nl
To: elecraft@mailman.qth.net
Sent: Thursday, January 27, 2011 6:44 AM
Subject: [Elecraft] APF measurements: FW 4.17 better results by 2 dB
Hello all,
Did some measurements on the different frimware versions. This time not
a BW-plot but I measured S+N/N ratio's.
I have no lab
-
From: Arie Kleingeld PA3A [hidden
email]http://user/SendEmail.jtp?type=nodenode=5967599i=0
To: [hidden email] http://user/SendEmail.jtp?type=nodenode=5967599i=1
Sent: Thursday, January 27, 2011 6:44 AM
Subject: [Elecraft] APF measurements: FW 4.17 better results by 2 dB
Hello all,
Did
Scott Ellington wrote:
Page 36 of the K3 owner's manual:
AFV shows the true RMS value of receiver AF output (mVp-p), unaffected by
AF GAIN control.
While that may be true for sinusoidal signals I doubt it holds for noise
measurements. Accurate noise measurements require a true
Bill,
Thanks for your added comments.
As I said, I do not have the lab equipment to do this. But there are
people in this group that have and can measure far better than I.
The APF (for me) is not about selectivity. I use it when digging into
the noise and get a better copy of weak signals.
Hi,
Doing true RMS over the selected passband is very easy to do with DSP and I
have no reason to doubt that the K3 dBV meter is a very close approximation
to true RMS even on signals that are far from sinusoidal (such as noise).
Analog is a different story and I agree that there are many false
Within the band-limited audio passband of the K3, the RMS metering is
very accurate. The algorithm is:
1) measure and square each reading
2) sum with the previous readings (accumulate)
3) do this for 500 ms or 1 sec
4) divide the sum by the number of samples taken
5) compute the square root
6)
=nodenode=5967599i=1
Sent: Thursday, January 27, 2011 6:44 AM
Subject: [Elecraft] APF measurements: FW 4.17 better results by 2 dB
Hello all,
Did some measurements on the different frimware versions. This time not
a BW-plot but I measured S+N/N ratio's.
I have no lab equipment
Barry N1EU wrote:
4.16 APF has the same response curve as all the other versions.
Q.E.D. If it has an identical response curve it has identical S/N
performance. Anything else is either differences in noise conditions or
human imagination.
73, Bill
--
View this message in context:
But Bill,
I had a sage manager many years ago who often stated Perception is 99%
of reality. Being of a scientific mind, I had my doubts at the time
thinking people will be convinced by the facts of science.
In later years, I have mellowed and now agree with that manager.
Perception IS 99%
Don Wilhelm-4 wrote:
I had a sage manager many years ago who often stated Perception is 99%
of reality. Being of a scientific mind, I had my doubts at the time
thinking people will be convinced by the facts of science.
In later years, I have mellowed and now agree with that manager.
Bill,
I am not suggesting Elecraft do anything other than the explanations
that have already transpired.
Yet even with such dialog and tests that say Q. E. D., there will be
many who remain unconvinced, and will want to stick with the old version
because it is better. They will not be
16 matches
Mail list logo
