On 1/6/2024 9:54 AM, Chris wrote:
Digital signals (square waves, waveforms with sharp edges) have very
high spectral content (_many_ harmonics), so you may see many lines at
constant frequency spacing all over the HF spectrum and beyond.
Switching power supplies (inside electronic devices, wall
On 1/6/2024 4:05 PM, Dave (NK7Z) wrote:
I have some articles on this subject at:
Dave's stuff is excellent.
I'm also an EMC professional, long time Vice-Chair of the EMC WG of the
Standards Committee of the Audio Engineering Society, principal author
of most of our EMC Standards. And I've pu
On 1/7/2024 5:40 AM, Dave (NK7Z) wrote:
Thanks for vote of confidence sir! I have a question for you... Have
you been following the discussion on CMCs and if they are coax, or two
wire, vs., constructed, and the results of impinged RFI on the cables
feeding a rig
I don't know about the grou
On 7/18/2025 9:28 PM, dave ingebright via Elecraft wrote:
So today I caught it. Started transmitting, and ATU went to full HIGH SWR and
then into fault mode.
At what power level are you tuning? Do you have the amp in standby mode?
73, Jim K9YC
_
On 7/19/2025 5:35 PM, Wayne Burdick wrote:
However, even 10-12 dB of clipping causes a fair amount of distortion.
Hi Wayne,
There's distortion, and there's distortion. Listening on the air for
speech intelligibility and watching the P3 for splatter, COMP at that
level WITH SPEECH does not pr
I agree with Dave. The problem is very likely somewhere in your antenna
system, including the feedlines, matching stuff, etc. FWIW, I've been
using KAT500s with KPA500s since they were in beta, and we've used a
pair of them in W6GJB's contesting trailer for almost that long, and
we've never had
On 7/19/2025 9:22 AM, QRP Labs via Elecraft wrote:
CESSB isn't the same thing as compression, or TX equalization (such as
attenuating the low frequency audio). Yes these things can all get you an
increase in average power etc. but are independent of CESSB.
After a career in pro audio and broadc
On 7/19/2025 7:29 PM, Jack Brindle via Elecraft wrote:
Sorry, but I have to ask this. If indeed this is the case, why does it not
apply to open wire, where water has no effect on the line and thus there is no
need to retune?
At least 30 years ago, one of the ARRL Antenna Compendiums published
On 7/8/2025 5:28 PM, n4cw--- via Elecraft wrote:
At the very end of its capacity (a weekend of mobile state QSO party activity
with a K3), the booster and K3 shut down due to minimum voltage required.
But these DC-DC converters are not 100% efficient, I'd bet no more than
90%, and as has bee
On 7/7/2025 6:59 PM, mjrosen via Elecraft wrote:
Considering adding the 100W amplifier which will only be used in the field.
Not SOTA or hiking, car trips for POTA and, vacation use. I have a 20AH Bioenno
battery that more than adequately powers KX-3 at 10-15W for QRP activations.
I've consi
On 7/8/2025 9:13 AM, Bob Stephens AF9W via Elecraft wrote:
At 12.6 volts I got around 80w.
80W is only one dB down from 100W. An S-unit is 6 dB.
73, Jim K9YC
__
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/ele
On 7/14/2025 12:17 PM, Gary Schulz via Elecraft wrote:
I would also love to see synchronous AM.
From the beginning, the K3 with the right bandpass module, and now the
K4 work great on AM in USB or LSB mode, and they're stable enough to
zero beat the carrier. I've regularly used them to verify
On 7/16/2025 10:39 AM, Gary Schulz via Elecraft wrote:
Love the radio but stating it is bug free and doesn’t need update/ feature
releases is a bit odd…
Let's get real. Elecraft is a small US company that is owned by two hams
who are both engineers, and one is a great marketer/manager/busines
On 7/16/2025 10:34 PM, Geert Jan de Groot via Elecraft wrote:
Doing this mechanism releases funds immediately for Elecraft to fund
developers to do the KX3 CESSB feature.
Hi Geert,
One thing I learned many years ago and taught my kids is that "the other
guy's job always looks easier." An impo
FWIW, the benefits of CESSB can easily be approached by a combination of
judicious use of TXEQ to kill the low audio frequencies below about 500
Hz, and adjustment of COMP for an indicated 10-12 dB of gain reduction
on voice peaks. That combination provides an increase of "talk power" of
about
On 7/21/2025 2:47 PM, Gerry Hull wrote:
The trustee license class does not determine privlege...the control
operator does.
Exactly right! But in situations like Field Day, an unlicensed person
or a ham holding a lower class of license can operate under the direct
supervision of a ham holding
On 7/21/2025 9:55 AM, Bob McGraw via Elecraft wrote:
I agree, window line changes when wet. But my measurements indicate it
is the velocity factor that changes.
This is consistent with the fundamental physics -- the dielectric is
modified, so Zo, VF, and loss are modified. Also, it's importan
On 7/21/2025 10:04 AM, Rick nk7i via Elecraft wrote:
Either call could legally be used (with permissions of course, implied
since the K4D password was shared); but the log book should show the
_*transmit*_ location; not the location of the K4/0.
70 years ago when I was first licensed, the piec
On 7/20/2025 3:12 PM, QRP Labs via Elecraft wrote:
This is
important because often people are using compression and without realizing
that due to the SSB overshoot problem, the ALC now has to reduce the gain
even more to avoid the splatter. In other words some of the dB you got by
using compres
On 7/21/2025 9:33 AM, Michael Carter via Elecraft wrote:
To me it sounds as though you're tuned to the sideband of a wide CW signal,
which I've heard on occasion. This results in the sound of modulated noise
rather than a pure tone.
This is "phase noise," which is a distortion product of the
On 7/22/2025 1:36 AM, QRP Labs via Elecraft wrote:
Yes Luis, I agree. "Magic" is a good way of putting it.
Sorry, I don't like that at all. "Magic" points people away from
understanding science! Everything we're talking about is engineering,
which by definition is the application of the laws
On 7/22/2025 1:07 AM, QRP Labs via Elecraft wrote:
As well as many months of yelling into a microphone and recording the
results. For most of the testing I used two transceivers with about 60-70dB
of inline attenuation, using the transceiver's internal sound cards to
provide sample audio tracks,
On 7/25/2025 1:57 PM, Michael Carter via Elecraft wrote:
Another thought, Andy, after I re-read your post on this topic. The K3 permits
per-band TX power control.
On K3 and newer Elecraft rigs, many other settings are also "per band"
and/or per mode. There's also TX INHIBIT, which is a long
On 7/27/2025 11:45 PM, David Gilbert via Elecraft wrote:
What percentage of interested parties actually get their license? What
percentage of those are active two years later?
Great questions, Dave. Trying it is a GREAT first step, but it's the
rest of the steps along the way that lead to a p
On 7/30/2025 1:37 PM, Michael Carter via Elecraft wrote:
My recollection is that the K2 main PCB does not have internal metal layers to
make up the kind of transmission lines needed to mitigate the issues you
highlighted.
I can't imagine that being true!
73, Jim K9YC
On 7/30/2025 9:53 PM, dyno lab wrote:
It is amazing how we were able to build radios with only 2 sided PCBs for 50
ohm micro or strip lines.
Come to think of it, it was actually pretty easy.
It all depends on HOW GOOD. It took micro or stripline to solve that low
level crosstalk issue with th
On 7/29/2025 7:36 PM, Declan Rieb via Elecraft wrote:
Is there a complete list of K-series (especially KX3) and ATU settings that are
saved:
Make sure you're reading the latest version of Elecraft manuals -- Wayne
tends to add little things like that folks ask for in the first several
years
On 7/30/2025 8:08 AM, Michael Carter via Elecraft wrote:
The standoffs likely provide localized grounding in that section of the RF
board. I'll have to look at the corresponding top-side circuit area to know
which circuits might be affected by lack of a local return path for currents.
Hi Mik
On 7/30/2025 2:36 PM, Michael Carter via Elecraft wrote:
If you can inject a signal at 10.125 MHz and hear even a bit of it, that would
be useful information.
Another way to inject signal on a band that is open is to tune to an FT8
frequency on the band with almost any wire connected as anten
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