Joe Subich, W4TV-4 wrote:
To normalize the radio's output power for any valid test you
need to measure the single tone carrier power (e.g., CW). If
you do that (press tune at 50 watts), you will recalibrate.
The recalibration will render any subsequent measurement
incompatible
Joe Planisky wrote:
To test this, I used an audio signal generator to input single tones
of various frequencies into my K3 in both LSB and DATA-A modes. I set
the power control for 30W. Here are my measurements:
AF input freq. Po-DATA-APo-LSB
TUNE25.7
I have just run a set of tests across a range of audio frequencies as did
Joe, KB8AP. The results were almost identical, so I am not going to tabulate
them here. In SSB I adjusted the input level to give sufficient drive and
just enough ALC action to result in a flat output from 600Hz to 2600Hz.
Ah! I must have been on an exact 5W setting when I did it, then, Joe.
Thanks for clearing that up.
I still think that as it's a calibration feature, it would make better sense
by being protected by the ability to turn it off. I'd really like to hear
why a calibration feature sits there
It seems as if part of the problem with the power control in DATA A mode may
be that the power calibration appears to be done at an audio frequency which
is sub-optimal for this mode. Ideally, the power calibration would be done
at the point in the filter bandpass where the transmit filter's
Planisky jp...@jeffnet.org
To: li...@subich.com
Cc: elecraft list elecraft@mailman.qth.net
Sent: Saturday, February 14, 2009 7:45 PM
Subject: Re: [Elecraft] K3 Beta firmware rev. 2.82
Hi Joe,
Further, single tone power calibration is only accurate for
the specific frequency within the IF filter
Richard Ferch wrote:
It seems as if part of the problem with the power control in DATA A mode
may
be that the power calibration appears to be done at an audio frequency
which
is sub-optimal for this mode. Ideally, the power calibration would be done
at the point in the filter bandpass
Guy, K2AV wrote:
Taking the DATA A readings below at face value, the more than 2 db bump
around 1000 Hz is rather startling. I'm not sure what could cause that,
but
at least to me that seems to be screaming for an explanation. There's an
old fireman's adage never go past fire to keep
On Feb 15, 2009, at 2/158:58 AM, Guy Olinger, K2AV wrote:
Taking the DATA A readings below at face value, the more than 2 db
bump
around 1000 Hz is rather startling. I'm not sure what could cause
that, but
at least to me that seems to be screaming for an explanation.
There's an
I'm not looking for another radio, as I've been doing what seems
obvious (to me) - using USB mode for sound card digital operation, not
DATA A. Yes, I forgo the benefit of the management of compression
setting and mic selection that comes with using DATA A - but as things
stand now one must change
, 2009 7:46 PM
To: li...@subich.com
Cc: elecraft list
Subject: Re: [Elecraft] K3 Beta firmware rev. 2.82
Hi Joe,
Further, single tone power calibration is only accurate for the
specific frequency within the IF filter on which the calibration is
performed. If I calibrate power in CW
Bob Cunnings wrote:
I'm not looking for another radio, as I've been doing what seems
obvious (to me) - using USB mode for sound card digital operation, not
DATA A. [snip]
Yes, I can see the logic in that, which is what I had to do with the K2
before the v2 firmware was released. But I
a
good idea.
73, Guy.
- Original Message -
From: Kok Chen c...@mac.com
To: elecraft list elecraft@mailman.qth.net
Sent: Sunday, February 15, 2009 12:31 PM
Subject: Re: [Elecraft] K3 Beta firmware rev. 2.82
On Feb 15, 2009, at 2/158:58 AM, Guy Olinger, K2AV wrote:
Taking
Graham Kimbell (G3TCT) wrote:
Julian
Before you do anything drastic like looking for another radio, can I ask a
silly question or 2?
If the output power is flat across the AF spectrum when using ssb mode,
why
doesn't everyone use it rather than DATA-A?
Well the main reason as I said
Steven.Zabarnick wrote:
I installed the new beta last and tested the new output power control. I
don't see any improvement in PSK31 output power using DATA A mode. I still
get nearly twice the output power than I have dialed in by the PWR knob.
In
the previous firmware, the measure
I discovered that my cw power issue was due to a bad power supply for my
Elecraft W1 wattmeter. My cw power measurement now agrees with the K3
setting. I still see a 50% higher power output in Data A mode than the K3
setting -- this is an improvement over the nearly 100% that I was seeing
using
: Saturday, February 14, 2009 11:58 AM
To: elecraft@mailman.qth.net
Subject: Re: [Elecraft] K3 Beta firmware rev. 2.82
Steven.Zabarnick wrote:
I installed the new beta last and tested the new output
power control.
I don't see any improvement in PSK31 output power using
DATA
Joe Subich, W4TV-4 wrote:
You CAN NOT make those tests at 50 Watts! The power calibration
circuitry will be constantly changing the internal gain. If
the ATU is enabled and/or your dummy load is not flat the changes
invalidate the measurements.
Why on earth not? I think you are
.
-Original Message-
From: elecraft-boun...@mailman.qth.net
[mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Julian, G4ILO
Sent: Saturday, February 14, 2009 3:44 PM
To: elecraft@mailman.qth.net
Subject: Re: [Elecraft] K3 Beta firmware rev. 2.82
Joe Subich, W4TV-4
Hi Joe,
Further, single tone power calibration is only accurate for
the specific frequency within the IF filter on which the
calibration is performed. If I calibrate power in CW mode
that calibration point is approximately 300 Hz from one
corner of the 2.8 KHz filter thanks to the way the
So, if I'm tuning up through, say, a Z-Match into a doublet and power output
is set to around 5 or 50W and press Tune in order to tweak the Z-Match,
the initial (off-tune) complex impedance the K3 may see could very well
cause the K3's output power to change to 5 or 50W and because of that,
[mailto:elecraft-boun...@mailman.qth.net] On Behalf Of David Lankshear
Sent: Saturday, February 14, 2009 7:56 PM
To: Elecraft@mailman.qth.net
Subject: Re: [Elecraft] K3 Beta firmware rev. 2.82
So, if I'm tuning up through, say, a Z-Match into a doublet
and power output
is set to around 5 or 50W
Conclusion must be, never ever use 5.0W or 50W except
when calibration is needed.
Why cant power calibration be turned off? Then we would
not have this source for trouble.
/ SM2EKM
Joe Subich, W4TV wrote:
So, if I'm tuning up through, say, a Z-Match into a doublet
and power output
In a recent message, wayne burdick n...@elecraft.com wrote ...
K3 beta-test firmware revision 2.82 (with DSP rev 2.00) is now
available. See release notes below.
Many thanks for the latest firmware - all installed successfully and
apparently working okay.
In a future release, would it be
I installed the new beta last and tested the new output power control. I
don't see any improvement in PSK31 output power using DATA A mode. I still
get nearly twice the output power than I have dialed in by the PWR knob. In
the previous firmware, the measure output power in CW modes agreed with
Hi Steve,
Seems to work correctly here even if I exceed the recommended 5 bars of
ALC.
73 Doug N3QW
- Original Message -
From: steven.zabarn...@notes.udayton.edu
To: elecraft@mailman.qth.net
Sent: Wednesday, February 11, 2009 9:16 AM
Subject: Re: [Elecraft] K3 Beta firmware rev
On Wed, 11 Feb 2009 09:16:45 -0500, you wrote:
I installed the new beta last and tested the new output power control. I
don't see any improvement in PSK31 output power using DATA A mode. I still
get nearly twice the output power than I have dialed in by the PWR knob. In
the previous firmware,
I don't see a problem with CW on my K3 (29.4W measured, 30W
requested,) but there are definitely still problems with excessive
power output in DATA-A. DATA-A initially output the correct power,
but after switching to AFSK-A and back to DATA-A, I get well over 2x
the requested power out
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