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in the main receiver.
Or perhaps some day I'll figure out how to do that myself. However,
first the K3 NB has to work in the absence of strong signals, which it
does not.
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to unpleasant surprises.
73,
Scott K9MA
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not a bad encoder.
If it's a firmware bug, as I suspect, others should observe the same
problem. Firmware is 1.02.
Has anyone else seen this?
73,
Scott K9MA
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threads, and it works great.
73,
Scott K9MA
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. They're sold under several brand names, and there are several
versions, all basically the same. I'm guessing I'm not the only one who
was attracted to their low price.
The fix is easy, though it took most of the day to figure out. Contact
me if you need it.
73,
Scott K9MA
--
Scott
KX-1.
Thanks and 73,
Scott K9MA
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to find another way to secure them.
Any suggestions?
Or maybe someone can assure me that with all those K3 getting shipped
all over the planet for DX-peditions, etc., none of those wires ever
break. Ever. (I'd still take along some magnet wire.)
73,
Scott K9MA
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would seem to require strictly less wire
and coils than any dipole or inverted vee, but am I missing some other
offsetting advantage?
Cheers,
Bruce
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On 3/3/2016 14:47, Fred Jensen wrote:
QRN, not QRM
I thought QRN was exclusively atmospheric noise. Perhaps we need a new
Q code for man-made garbage.
73,
Scott K9MA
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could be
made to do that, I'd buy the 15 kHz filter instantly.
73,
Scott K9MA
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The old FT-1000D is notorious. (I have one.) I'm not sure about the
MP. There's a mod, which helps, but it's still wide. It's a big reason
I bought a K3.
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On 1/14/2016 11:26, Rick WA6NHC wrote:
I've noticed that it is directly proportional
on the K3. Currently the K3 does not send an update to the P3 if
switching antennas causes the preamp or attenuator status to change.
This is on Wayne's bug list.
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anyone put up with us :)
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It's implicit in Alan's posting, but note that symmetrical square waves have
only odd harmonics. The even harmonics will be very, very weak, present at all
only because the square wave isn't quite perfectly symmetric.
Scott K9MA
Scott Ellington
Madison, Wisconsin
USA
On Apr 14, 2011, at 1
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Scott Ellington
Space Science and Engineering Center
University of Wisconsin
. (You may be close enough initially.)
8. Using the K3 utility, save the configuration. (Or record the REF CAL
value.)
9. Cancel SPOT and exit the menu.
73,
Scott K9MA
Scott Ellington
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, and if the sidetone
frequency is derived from the same master oscillator aren't you defeating the
purpose of your calibration. It seems logical to me to a method of
calibration that your reference is not derived from the same oscillator you
are trying to calibrate.
Scott Ellington
Madison
. Have to dial around to get clear
signal so if I don't then they do not hear my calls well. Am sending this
message to K3 support a well but appreciate any responses from the
community.
Scott Ellington
Madison, Wisconsin
USA
signals fading up and down rather than a beat
note. That fading *is* the beat note but it's too low a frequency to
hear it as a tone.
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the wire a ways and makes it brittle, so you need
to make sure the wire doesn't flex a lot near the connector.
73,
Scott K9MA
Scott Ellington
Madison, Wisconsin
USA
On Mar 25, 2011, at 12:02 PM, George A. Thornton wrote:
I am not an electronics expert, but I work closely with someone who
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It may NOT be a good idea to gate the KEY_OUT with the foot switch because of
timing issues. If you release the foot switch while transmitting, the
amplifier relay, especially a fast QSK relay, could release before the K3 RF
output decays, resulting in hot-switching of the relay. KEY_OUT
something or is this
normal?
Tnx de Sy K6PWP # 5223 (one week old)
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On Mar 11, 2011, at 2:47 PM, Scott Ellington wrote:
I think this is normal, and it's annoying. I don't know of any other
transceiver that behaves this way.
73,
Scott K9MA
On Mar 11, 2011, at 2:40 PM, Sy Botan wrote:
Most of my operating is on CW. While staying in the CW receive
a spare pin on the
MCU chip that could be used to gate KEY_OUT.
End of discussion, I think.
73,
Scott K9MA
On Mar 11, 2011, at 3:26 PM, Scott Ellington wrote:
Not necessarily. The PTT Out line may control more than just the internal
amplifier relays. For example, if one uses a separate
the
Key Ports on the back side
(Paddle with the internal Keyer or even with an external keyer)?
73 de
Wolfgang DK9VZ
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it with
an accurate DVM. Then see what the K3's internal shunt voltage is reading.
That's what you are actually seeing.
73, Guy.
On Mon, Feb 28, 2011 at 12:48 PM, Scott Ellington
sdell...@facstaff.wisc.edu wrote:
Has anyone compared the K3 internal current meter to an accurate external
They did!
Scott K9MA
On Feb 28, 2011, at 10:56 AM, Amateur Radio Operator N5GE wrote:
It would be really be nice if they had designed the P3 with a cutout in the
rear
for an External Display. That way they could add an external video output at
a
later time.
Tom, N5GE
Scott
Has anyone compared the K3 internal current meter to an accurate external
meter? My K3 meter reads about 20A, when the actual current is 23 A, with no
accessories connected. That's a huge error, and it's not linear.
73,
Scott K9MA
Scott Ellington
Madison, Wisconsin
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during the contest, when other kinds of NB
are useless.
73,
Scott
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. The
radio worked well before the trip. This wasn't the only problem, this was a
very tough trip in many different ways.
Why does my K3 only put out 12 watts? What can I do to troubleshoot the
problem.
Thanks
Dale - N3BNA
Scott Ellington
Madison, Wisconsin
USA
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. If that is
the case then I am assuming that the signal within the frame of the cursor
is not a signal that has passed through my roofing filters.
Is this a correct interpretation?
73, phil, K7PEH
Scott Ellington
Madison, Wisconsin
USA
and unaffected by my filter
choice other then the fact that the cursor itself has changed size.
phil
On Feb 23, 2011, at 11:08 AM, Scott Ellington wrote:
The K3 IF output to the P3 comes from the Post-amp following the first
mixer, ahead of the crystal filters. The only upstream filters
a collection of these measurements.
You'll need to be fairly loud here.
73,
Scott K9MA
sdell...@facstaff.wisc.edu
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voltage drop (twice as much on 120V).
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populations
have, trying to reduce the splatters.
73,
Jorge
CX6VM/CW5W
k3 #4077
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I must disagree with Ron about the matching tones. When you zero beat the
transceiver with a received signals using the sidetone or spot tone, matching
the frequencies of those two audio tones is exactly what you are doing. With a
tracking sidetone, as in most modern transceivers, those two
controls. and no
useful reason for them to be adjusted by a single volume control.
Richard K5BWV
Sent from my iPhone
On Jan 31, 2011, at 15:47, Scott Ellington sdell...@facstaff.wisc.edu wrote:
How about independent control of sidetone and spot level?
Scott K9MA
Scott
tracking sidetones, generated
by exactly the same frequencies which produce the received signal beat note.
73,
Scott K9MA
On Feb 1, 2011, at 1:03 PM, Ralph Parker wrote:
Funny how 'zero beat' means something different today compared to years ago.
Scott Ellington
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signals.
Scott Ellington
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need is a feature which
gets the OTHER station on frequency. Now, I understand that this is
technically challenging, but that's just the sort of thing the folks at
Elecraft are so good at.
Meanwhile, I guess we'll just have to hope that more of those operators buy
K3's.
73,
Scott K9MA
Scott
to
ignore stations who are not calling you :-)
73,
Geoff.
GM4ESD
Scott Ellington wrote on Monday, January 31, 2011 at 18:38Z:
Now that we have such great filters in the K3, we have another problem: Many
other operators just can't find the right frequency. Not only do
help me
zero-beat accurately. Anyone else have that problem? (CWT isn't useful if
there are multiple signals in the passband, as there usually are in contests.)
73,
Scott
Scott Ellington
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From: elecraft-boun...@mailman.qth.net
[mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Scott Ellington
Sent: Monday, January 31, 2011 3:16 PM
To: Elecraft Reflector
Subject: [Elecraft] K3 Spot Tone Level
The K3 Spot tone level apparently tracks the Monitor sidetone level. I
like
...which is not what is in the K3 dBV meter.
Scott Ellington
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(just like the HV
supplies in the tube-type amplifiers), it probably also has a power factor in
the 0.7 range, and probably draws 11-12 A at 120 V. A dedicated 20 A circuit
would improve regulation.
73,
Scott K9MA
Scott Ellington
Madison, Wisconsin
USA
On Jan 25, 2011, at 1:02 PM, Jim Brown wrote:
On 1/25/2011 10:37 AM, Scott Ellington wrote:
but my AL-82 once blew the 15 A 240 V fuses, which suggests PF was less than
about 0.7.
More to the point, the main thing that blows breakers with very large
power supplies is the inrush
on 160.
Any who want to argue, let's do that off line.
73,
Scott K9MA
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as it was
at the time.
There's no doubt they were real, but what might be the
cause? Is / was the problem with his K3, my K3 or my P3.
Thoughts?
73!
Ken Kopp - K0PP
elecraftcov...@gmail.com
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13, 2011, at 8:47 AM, Gary Mohrlant wrote:
I have looked at the manual and on line and I haven't found the tuning
range of the KAT3 tuner. Anyone have this info?
Gary W0GHZ
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Exactly.
Scott K9MA
On Jan 13, 2011, at 9:15 AM, Guy Olinger K2AV wrote:
The answer to the question is a fairly large dataset,
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. That said, when things get real tough or I get tired, I'm very glad
of the ability to shift the upper or lower limits independently, the very
nice narrow roofing filters and amazing non-ringing DSP good down to less
than 50Hz bandwidth.
73
Gary ZL2iFB
Scott Ellington
Madison, Wisconsin
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No doubt Eric or Wayne has done that calculation.
73,
Scott K9MA
On Jan 13, 2011, at 10:39 AM, Eric Swartz WA6HHQ - Elecraft wrote:
Approximately up to 10:1 on most bands. Less on 160M and 6M.
73, Eric
Scott Ellington
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,
Scott K9MA
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. (This is a classic cause of RF
susceptibility.) If not, a few ferrite cores is a small investment.
73,
Scott
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there's an easy way to ground those rear
panel jacks more directly to the chassis. (This is a classic cause of RF
susceptibility.) If not, a few ferrite cores is a small investment.
73,
Scott
Scott Ellington
Madison, Wisconsin
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to the chassis at each end. Now, the RF current
flows on the coax shield to the chassis at each end, so it does not
cause problems with the keying circuit.
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- AD5X
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right. The MRF150 MOSFETs used in ALS600 are rated at 20dB. I
know people who homebrewed similar amplifier without series resistor and have
full 20dB of gain - no problem whatsoever, stable like a rock.
Scott Ellington
Madison, Wisconsin
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(closer to W6 than W2...hint
hint) who will custom make you an amp for low power drive. Check the
FT817 Yahoo group archives.
de Doug KR2Q
had my fill of QRO ages ago
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replace just the
rubber/plastic part, or do I need to replace the entire switch
assembly?
Thanks and 73 de Dave, W5SV
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.
On Tue, Dec 14, 2010 at 11:28 AM, Scott Ellington
sdell...@facstaff.wisc.edu wrote:
The K3 noise blanker bandpass filter appears to have a bandwidth of about
400 kHz, so any strong signal within that bandwidth will affect its
operation. This is a problem with all noise blankers of this type
Another interesting question is how any manufacturer of ham radio gear is going
to stay in business once we aging boomers stop buying new radios.
73,
Scott K9MA (Check 66)
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, it seems to me that when in DATA A mode
that the state of the KEY jack should be ignored. Even if KEY has a
closure, it should not impact PTT in DATA A or SSB modes, or am I
mistaken.
73, de Nate
Scott Ellington
Madison, Wisconsin
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a fiber disk to provide the friction. The result is a
slight bit of noise as the knob rotates along the disk.
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range.
Scott Ellington
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the monitor.
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crimp tool. The welding
cable would weigh more than the K3.
That said, I'm considering remote sensing, but I'll have to reverse-engineer
part of the power supply to do it. If it works, I'll post the method and
results, though it will only apply Samlex SEC-1235.
73,
Scott K9MA
Scott
,
Scott K9MA
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If one wants to measure MDS, a metal enclosure is probably necessary.
Scott K9MA
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exiting the XG2 by radiation rather than conduction.
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aluminum tape or
something like it. Would that work?
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differently, of
course, though the filter in my head probably isn't an exceptionally good one.
There are some very good cw contest operators who do nearly all their operating
using the SSB filter.
Scott K9MA
Scott Ellington
Madison, Wisconsin
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in pitch.)
4. If the two sidebands don't sound the same, adjust the offset for that
filter until they do.
This assumes, of course, that your xtal filter is OK except for a possible
offset.
Hope this is of use to others.
73,
Scott K9MA
Scott Ellington
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and I will check the
connectors.
73 to all.
Luigi HB9CXZ
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feedback.
chuck
af4xk
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and got a nice Astron 35m which is totally silent. I hate fan noise.
N4LQ
Steve
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Sounds like RF feedback. Do you see the same problem with a dummy load?
73,
Scott K9MA
Scott Ellington
Madison, Wisconsin
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On Oct 14, 2010, at 2:37 PM, Luigi Casari wrote:
Ragards to all,
I have just discovered a problem, 28 MHz or 21 MHz SSB, during transmission
the power drop
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Stephen G4SJP/
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that, I/II would not
switch to the 2.1 kHz filter. Behavior was similar in CW mode. Am I missing
something?
73,
Scott K9MA
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.
Scott K9MA
On Aug 20, 2010, at 3:00 PM, Scott Ellington wrote:
Some power supplies, like the Samlex SEC 1235, have no built-in overvoltage
protection. All regulated power supplies are capable of producing much more
than their normal output voltage if any one of a number of things fails
the power supply output and, if
necessary, blow a fuse.
http://www.ssec.wisc.edu/~scotte/hr/OVP.pdf
I haven't built this one yet, but a very similar one I built in 1984 worked
fine.
73,
Scott K9MA
Scott Ellington
Madison, Wisconsin
USA
can count on
that.
Scott K9MA
On Aug 20, 2010, at 3:22 PM, Paul Christensen wrote:
AD5X created a similar circuit using a single high-peak-current
transient suppressor:
http://www.radiodan.com/ad5x/images/Articles/VcondRevA.pdf
Scott Ellington
Madison, Wisconsin
USA
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