*Both items have been sold!*
Bill N0CU
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K3S/10-KS/N 10726Purchased: 27 Mar 2016
KANT3
KTCXO3-1(0.5 ppm)
KFL3A-2.8(2.8 KHz)
KFL3A-6K-IR(6 KHz)
KBPF3A
K3S/P3 book by Fred Cady
$1775
P3 S/N 4197
P3SVGA
$650
Both for $2325
Prices include shipping, all manuals, & cables
Bill N0CU
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Jim,
I apologize: I made a typo in my post. It should have said "...the highest
choking IMPEDANCE is usually obtained with an air core choke (coax looped
with or without some form like PVC)". Maybe this is an over-statement, but
of the few chokes I have tested, air core chokes made with just
Mike,
Wes raises one of the many interesting aspects of balun design, and not
surprisingly, one that there doesn't appear to be a consensus on. Two of the
main trade offs are bandwidth and choking impedance. The highest choking BW
is usually obtain with an air core choke (coax looped with or
I was going to respond to Jim’s comments about terminology, but Wes presented
my thoughts better than I could have.
I would like to address two of the comments that were made in the responses.
First, EZNEC is powerful tool that can help understand theoretical behavior
of ideal antenna systems.
I am no expert when it comes to baluns, but here are several comments that
are based upon some research that I have recently done on the subject:
1) Now, unlike in the past, the most commonly used balun is the current
balun. Most current baluns use some type of transmission line (if they do,
they
Jeff,
Is your sub-receiver still available?
Bill N0CU
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Benny,
I recently had Elecraft replace a KLPA3A again. They also did the Tx IMD mod
and an alignment.
I am now seeing the following 3rd order IMDs:
4W -40 dBc
8W -40 dBc
9W -35 dBc
10W -30 dBc
12W -20 dBc
What is also encouraging is that now the higher order IMDs (5, 7 & 9th) stay
at
I frequently wonder just how much protection a typical SWR protection circuit
can provide against an instantaneous discontinuity if it relies totally on a
feedback approach. If the response time of the feedback circuit isn’t faster
than the risetime of the voltage at the output transistors that
The reason your antenna was a lot less finicky with a bit of coax is that the
EFHW antenna requires a return path for the RF field. Theoretically, without
a return path, the antenna won't radiate at all. The recommended setup for
this antenna is for a .05 wavelength counterpoised to be used. EZNEC
I am having a strange problem with my K3s/10: the max output power on 20M
drops from 11.5W to 7.5W as the freq is moved from 14.0 MHz to 14.35 MHz.
All of the other bands stay above 11W across their respective bands. The
other interesting characteristic is that if I lower the power to 5W, there
is
"The polarization does not matter to radiation pattern. "
This isn't the case for most antennas we use which launch an electromagnetic
wave by generating an electric field. Ground characteristics affect the
pattern of a vertically polarized wave much more than they affect a
horizontally polarized
The official response I got from the factory is that to have any of the IMD
mods done, the radio needs to be sent in to the factory.
Bill N0CU
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Wayne,
For those of us with the unmodified KLPA3A (10 W module), can the mods be
done by a skilled engr/tech. If so, can the parts be made available as a
kit. If not, can just the module be sent in for modification instead of the
whole radio.
Bill N0CU
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I would not expect the synthesizer (old or new) to be a contributor the IMD
issue. Hopefully someone will correct me if that is a bad assumption. To me,
the primary issue appears to be the linearity of the two RF power
amplifiers.
During the course of my troubleshooting, I noticed that a number
I was not surprised to see a comment about the Tx IMDs in the QST article.
One of the first problems I encountered with my new K3s/10 was poor Tx IMD
performance. What I observed was flat topping that started at about 5W, and
progressively got worse as the power was increased. The distortion was
That's it.
Thanks Howard.
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Ken,
I am using the USB interface to the computer and am having trouble figuring
out how to set the audio levels for WSJT-X:
-On receive the decoder is saturated. I have to drop the gain slider in
WSJT-X to zero to be able to decode any signals. I haven't found any other
adjustment for the
I saw this info on one of the websites a few weeks back but I can't find it.
Thanks,
Bill N0CU
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I am starting to use some digital modes and couldn't find any
specs/guidelines on max power, duty cycle or FP temp. Running only 5W on
JT65 (ie, 50% duty cycle) I see the FP temp get up to 43C after just one or
two QSO's. Is an external fan recommended when using high duty cycle modes?
Thanks,
I am uncertain on how to configure the radio's filters using the K3 Utility.
I have the 6 KHz & 2.8 KHz filters. I am totally confused by Cady's book,
which shows (pg 27) almost all of the ENABLE boxes checked. This doesn't
make any sense to me since I doubt the hardware can be configured with all
I recently got a new K3s/10 built up and running. This week I ran some tests
to get familiar with it and one test that surprised me was the high Tx IMD
levels. I first noticed that the two tone waveform on a Tek o'scope showed
flat topping starting at about 4.5 W. As the power level was increased
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