This thread saved me. I thought my k3 antenna tuner had malfunctioned on 6 m,
but luckily it was only because it was in Split (Data mode). The erratic
behavior of the ATU and the SWR are quite confusing though as they tell you
nothing about this cause.
-
Sverre, LA3ZA
K2 #2198, K3 #3391,
Wayne.
A CW sidetone pitch of 400 Hz is consistent with what little research there
is on this. A paper from 1992 stated that "All subjects improved their
recognition as the frequency was lowered to 500 Hz, some even at 250 Hz."
See
Wayne.
A CW sidetone pitch of 400 Hz is consistent with what little research there
is on this. A paper from 1992 says that "/All subjects improved their
recognition as the frequency was lowered to 500 Hz, some even at 250 Hz./"
See
There is the AB3AP K2 Settings Retrieval Software
http://udel.edu/~mm/ham/elecraft/params/
It was discussed on this list here:
http://elecraft.365791.n2.nabble.com/K2-Settings-Retrieval-Software-td7599921.html
-
Sverre, LA3ZA
K2 #2198, K3 #3391,
LA3ZA Blog: http://la3za.blogspot.com,
Going back to the original question, then LP_Bridge in combination with
DXLabs Commander allows one to use and control both WSJT-X, a logging
program, and a contest program with port sharing at the same time. I wrote
it up here: http://la3za.blogspot.com/2019/06/port-sharing-for-wsjt-x.html
I use the opportunity to follow up on this thread. The IF output of the K3
and K3S is centered on 8.215 MHz.
But there is also a second IF at 12 kHz with no output. I wonder if anyone
has made an output for the I- and Q- channels at 12 kHz. It looks fairly
simple to find judging from the
Doug,
Yes, thanks, you're right. I have the preamp set up to be active for the
higher bands 12, 10, and 6 m, and in the bypass position otherwise. I use
this to connect an old shortwave receiver (not an SDR) to my main antenna,
so I guess it doesn't hurt for it with the extra gain. But I'll try
Thanks, Joe.
Works nicely and saved me the cost of something like the MFJ-1708B-SDR SDR
RF sensing T/R switch!
-
Sverre, LA3ZA
K2 #2198, K3 #3391,
LA3ZA Blog: http://la3za.blogspot.com,
LA3ZA Unofficial Guide to K2 modifications:
But what if there is a PR6-10 preamp in this path. Where should the
splitter/TEE-adapter be in that case?
>In brief, it takes a TEE adapter and 2 short pieces of coax. Put the
>adapter between the 2 pieces of coax, and then connect one coax to ANT
>OUT and the other to ANT IN.
-
Very nice report - thanks!
-
Sverre, LA3ZA
K2 #2198, K3 #3391,
LA3ZA Blog: http://la3za.blogspot.com,
LA3ZA Unofficial Guide to K2 modifications:
http://la3za.blogspot.com/p/la3za-unofficial-guide-to-elecraft-k2.html
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It seems like I get my K3 and the new 1.7 version of WSJT-X to work together
if I set up the program for only Split = "Fake it", but not Mode =
"Data/Pkt" (so it is set for "None"). Two of these commands seems to be too
much for the timing, but one alone is fine.
Joe Subich, W4TV-4 wrote
> Is
Hi Joe
Thanks for the explanation. It sounds like this is it as it explains why the
K3's VOX has to be reengaged in order to continue transmitting.
-
Sverre, LA3ZA
K2 #2198, K3 #3391,
LA3ZA Blog: http://la3za.blogspot.com,
LA3ZA Unofficial Guide to K2 modifications:
On the wsjtgroup at Yahoo, there are now two of us who have a problem with
the newly released version of the WSJT-X program and the audio output
level/VOX for the K3.
KY7M describes it as follows: "I have been transmitting perfectly in WSJT-X
1.6. As soon as I install 1.7, my transmit light goes
Hi Tom
Looking forward to hearing about your results!
Tom Azlin W7SUA wrote
> Good question. I ordered one and will find out when I try to put it in.
> I could find no instructions but have not written back to see if they
> have any.
>
> 73, tom w7sua
73
-
Sverre, LA3ZA
K2 #2198, K3
The QRP shop IF buffer amplifier looks spot on, but does anyone have any
experience with it? The information is a bit sparse, but says "Small Kit do
provide the K2 with a buffered IF Output. Installation with or without
Noiseblanker possible. "
It seems like it fits in the connector of the noise
I have photos of the K3's display as it is locked to an external 10 MHz
reference on my blog site (as images 2 and 3). Perhaps that could be of some
help in troubleshooting the K3EXREF. See
http://la3za.blogspot.no/2015/10/just-good-enough-10-mhz-reference.html
-
Sverre, LA3ZA
K2 #2198,
I've been using an 80 m horizontal loop for as long as I have had my license,
about 15 years. It's a bit irregular with two supports on my house and three
in trees, height is 7-12 meters. I feed it with open wire feeder to an
indoor Elecraft 4:1 balun and then use the tuner of the K2 or K3 to
Thanks for very quick responses to my question - I'm overwhelmed! I'll remove
the top cover and start right away!
I have two antennas, and no special receive antenna, and the two antennas
are connected to ANT1 and ANT2 all the time. If I reroute the KRX3 AUX input
to the KAT3, I will be able to
When I built my K3 some years ago I routed the second receiver's AUX antenna
input to the rear panel BNC connector. But now I have changed my mind and
want to route it through the KAT3 instead, in order to try diversity
reception.
How complex is this to accomplish? I know I need to plug in
OK, Don - no problem with that :-)So the effect is most striking and easiest
to do on the old A level board, but it is doable and has a positive effect
even on the B level (i.e. the present) K2 board as Bill W4ZV testified to in
his response in this thread also.
Don Wilhelm-4 wrote
> Sverre.I beg
The TF3MA sidetone mod is still current as it is in fact a modification of
the B level board, not just the A level board, as the site states that this
is an improvement of exactly the 47k / 82 mH A to B improvement mentioned in
the quote below. See
See http://la3za.blogspot.no/2016/02/teeth-marks-in-k3.html
-
Sverre, LA3ZA
K2 #2198, K3 #3391,
LA3ZA Blog: http://la3za.blogspot.com,
LA3ZA Unofficial Guide to K2 modifications:
http://la3za.blogspot.com/p/la3za-unofficial-guide-to-elecraft-k2.html
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An 80m or 160m signal echo after about 1/7 second may seem like a
round-the-world echo. But it is more likely that it is a ducted signal in
the magnetosphere. The actual delay varies with geomagnetic latitude, and
the further south one is the closer the delay time is to 1/7 second.
Such signals
The K3 macro I use the most is "Speakers on/off" for whenever I want to use
headphones. See macro 3 here:
http://la3za.blogspot.no/2013/12/clever-k3-macro-trick.html
-
Sverre, LA3ZA
K2 #2198, K3 #3391,
LA3ZA Blog: http://la3za.blogspot.com,
LA3ZA Unofficial Guide to K2 modifications:
I would not have upgraded to the KDSP2. Not for the performance, because
although I'm mainly a CW operator, I could probably benefit from it.
My main objection to the KDSP2 is user interface. The K2 was not designed
for the KDSP2 in the first place as can be seen in how complicated it is to
set
That should be *too high*, not too low.
Sverre Holm (LA3ZA) wrote
> I consistently get the P3's center frequency to be too low - in this
> example about 45 Hz too low. See screen capture here:
>
> http://folk.uio.no/sverre/LA3ZA/Offset-P3-K3-400HzXFIL-LA3ZA.jpg
-
Sverr
I'm seeing something similar, but I'm not sure if it's the same effect or
something related.
Using 400 Hz bandwidth and a 400 Hz roofing filter, and using Auto to
zero-beat a CW signal, I consistently get the P3's center frequency to be
too low - in this example about 45 Hz too low. See screen
I just learned from an offline email that this can be fixed using the Cal
function in the P3 (preferreably after 1 hr warm-up) - and indeed that was
the case! Thanks to Bill, NR4C.
Sverre Holm (LA3ZA) wrote
> That should be
*
> too high
*
> , not too low.
> Sverre Holm (LA3ZA)
My experience is that the simple GPS-based 10 MHz reference works well with
the K3. The K3 is quoted as measuring frequency to 1 Hz accuracy, implying a
measurement time of the order of 1 second. That seems to be enough to smooth
out the jitter from the Neo-7M.
Of course, there are better
I have now posted a full description of my just good enough 10 MHz reference
based on the Ublox Neo-7M 12-13 USD GPS on my blog:
http://la3za.blogspot.com/2015/10/just-good-enough-10-mhz-reference.html?spref=tw
It has photos and schematics and shows how it affects the K3's reference
oscillator
The country you may be referring to is Norway, where it has been decided to
switch off all the biggest broadcasters from FM (88-108 MHz) in 2017 as the
first country in the world, http://www.bbc.com/news/technology-32380222
It has been a controversial decision, I for one have critized the audio
-
Sverre, LA3ZA
K2 #2198, K3 #3391,
LA3ZA Blog: http://la3za.blogspot.com,
LA3ZA Unofficial Guide to K2 modifications:
http://la3za.blogspot.com/p/la3za-unofficial-guide-to-elecraft-k2.html
--
View this message in context:
initial setting for the reference
was 49,379,640 which I determined manually when the K3 was new in 2009 or
so.
I am going to write this up on my blog with schematics eventually.
Sverre Holm (LA3ZA) wrote
> Some recent GPS modules (ublox Neo 7) have a programmable output that in
> addition to
to make a
connection to it oneself.
Sverre Holm (LA3ZA) wrote
> I have done some more experimenting now with my poor man's 10 MHz
> reference. The ublox Neo-7 GPS is a lousy frequency reference in most
> respects, except that it is accurate in keeping exactly 10 million periods
> pe
Pictures of SP3 can be found on Elecraft's Twitter account:
https://twitter.com/elecraft/status/642473404080091136
-
Sverre, LA3ZA
K2 #2198, K3 #3391,
LA3ZA Blog: http://la3za.blogspot.com,
LA3ZA Unofficial Guide to K2 modifications:
I'm using a feed off the KXV3A's Rx in and Rx out ports, as you say, to feed
a shortwave receiver. It's very simple with no splitter, just a BNC Tee
connector.
The K3 needs to be switched to a band which is higher than the external
receiver for it to work as RF is routed through the K3's output
Some recent GPS modules (ublox Neo 7) have a programmable output that in
addition to the 1 pps output can be programmed even to output 10 MHz. This
output has a lot of jitter as it seems to be derived from a 48 MHz clock
which is divided down in such a way as to generate a mix of short and long
I am aware that a GPSDO etc is fine. But is it overkill for the K3?
What I am trying to determine is the minimum requirement for the oscillator
that will drive the K3's external reference input. The documentation says
that the K3's phase stability is not affected by the external reference.
That,
I'm about to replace one of the small encoders on my K3 (as per these
instructions
http://www.n5na.net/s9y/index.php?/archives/26-Replacing-Elecraft-K3-Push-Button-Encoders.html),
but I have a hard time removing the four knobs for shift/low, hi/width,
speed/mic, and cmp/pwr. Is there a way to get
I finally made it by just persistently nudging and pulling them. In the end
they came off all four of them without any damage neither to the knobs nor
the front panel.
Sverre Holm (LA3ZA) wrote
Is there a way to get them off their axes without either scratching the
front panel or breaking
The K3 and thus presumably the K3S implements one particular form of the
Least Mean Squares algorithm called the Leaky LMS, see Lyle's response some
years ago:
http://elecraft.365791.n2.nabble.com/K3-NR-td1557606.html#a1557836
That's an adaptive version of a Wiener filter that doesn't get so
It is also quite easy to make a reconfigurable microphone header yourself for
the K2. Go to
http://la3za.blogspot.no/p/la3za-unofficial-guide-to-elecraft-k2_28.html#KSB2
and search for 'microphone header' for ideas.
-
Sverre, LA3ZA
K2 #2198, K3 #3391,
LA3ZA Blog:
Is it only my K3 that has this imaging problem with the audio?
I have my L-MIX-R set to A Ab meaning that the main receiver's audio
should be centered in the headphones. That works fine when the sub-receiver
is on, but as soon as I turn it off, the audio drifts to the left. There is
still audio
Yes, my AFX was accidentally turned on.
Thanks to Gary and Guy. Now the CQ WPX contest is going to be much more
gentle on my ears!
73
-
Sverre, LA3ZA
K2 #2198, K3 #3391,
LA3ZA Blog: http://la3za.blogspot.com,
LA3ZA Unofficial Guide to K2 modifications:
Of course, the XV144 is the external transverter. What I had in mind were
those who already have the K144XV and who find all these false carriers so
annyoing that they are tempted to go to such a drastic measure as to move
the transverter to the outside.
Joe Subich, W4TV-4 wrote
But can the
Good to hear that others are hearing it as well, so then it is for sure
nothing that radiates in our shack. I've heard of two now, at 144,411.09 MHz
and 144,414.8 MHz respectively.
What we found at our club station's K3 was:
- it cannot be heard on the 28 MHz band which is where the 2m band is
Hi Mike
The K2 program compiles fine locally on my Windows 7 PC and runs without
security warnings now. Thanks!
--
If you reply to this email, your message will be added to the discussion
below:
Hi Don
Yes, you are right. So the software should only be used right before/after
adjustment and then the cable should be removed.
Indeed the K2/100 I just had here had the cable plugged in, but that was
not because of this software. I think it was just because the previous
owner didn't know
Hi Mike
Good to hear from you. I don't really know what it takes to make the
programs more useful. All I know is that everything that has to do with Java
has gotten more and more difficult to use, especially for Windows users. I
am running Windows 7 here myself.
Therefore, after quite some
I just wanted to remind the list of the AB3AP software found on
http://udel.edu/~mm/ham/elecraft/
I'm especially fond of the software for K2 Settings Retrieval about which
he says Save your K2 set up in case of an unexpected reset.
I have just serviced a K2 where the previous owner had had
There is evidence that it is advantageous with a low tone for the pitch
(asuming normal hearing). Some studies give evidence for an improvement in
recognition rate as the pitch is lowered and it more or less seems to level
off at 500 Hz, except for the lowest SNRs where recognition even improves
I cannot find the K2 manual any longer on
http://www.niftyaccessories.com/Elecraft_RefGuide.htm I really like these
manuals and was about to recommend it for a K2 owner when I noticed that it
was no longer there. Have they been discontinued?
-
Sverre, LA3ZA
K2 #2198, K3 #3391,
LA3ZA Blog:
My K2 is also old now - 14 years I believe - and I don't use it that often
any longer. I notice that the pushbuttons need some exercising before they
work now. For instance no 7 and 8 (where I have CW stored for LA3ZA and 5nn
- yes, I'm a lazy CW operator!). Is there any cure for this - other than
I couldn't agree more. I'm glad I finally discovered the single-lever paddle
after more than ten years of struggling with iambic. It is so much easier to
use the single-lever and it is much more forgiving for small timing errors.
I wrote about it on my blog some time ago:
Thanks David,
David G4DMP wrote
No, Sverre, I did not need an adjustable 5V control voltage as the MV89A
was spot on 10,000,000.00 Hz
-
Sverre, LA3ZA
K2 #2198, K3 #3391,
LA3ZA Blog: http://la3za.blogspot.com,
LA3ZA Unofficial Guide to K2 modifications:
I wonder what's the experience with the MV89A, does it need a lot of
adjustment of the control voltage, or does it have this kind of accuracy out
of the box?
David G4DMP wrote
but recently got a 10MHz MV89 double oven CXO which is inexpensive and
excellent. Mine is accurate to the nearest
Thanks to David, G4DMP and Ed, KL7UW for valuable information.
Now, shall I press BUY on Ebay for the Morion MV89a or not
-
Sverre, LA3ZA
K2 #2198, K3 #3391,
LA3ZA Blog: http://la3za.blogspot.com,
LA3ZA Unofficial Guide to K2 modifications:
A question regarding the DOCXO, double ovenized crystal oscillator to Chuck,
W7CS. I'm completely new to this, but after having looked at a few in ebay,
I see that they have an input for frequency control.
Do you use them as is, or do you calibrate them by setting the control
voltage? And how
Prompted by the recent thread on K3 fan replacement in order to make it more
quiet, I wonder if anyone has done anything similar on the KPA100?
-
Sverre, LA3ZA
K2 #2198, K3 #3391,
LA3ZA Blog: http://la3za.blogspot.com,
LA3ZA Unofficial Guide to K2 modifications:
In the context of the LMS filter for FIR notch filtering and noise
cancellation, one common way to find the reference is by a simple delay of
the input signal. If the purpose is to separate voice from a sinusoid, then
one utilizes the fact that a sinusoid has a long correlation function in
time
There's a couple of ways to use Bluetooth with the K2 on my list of mods
(internal/external), and there are more on the mailing list. Some of them
are some years old, so maybe some better ways are possible today?
See
http://la3za.blogspot.no/p/la3za-unofficial-guide-to-elecraft-k2_28.html#IO
Cool looks, I like that!
-
Sverre, LA3ZA
K2 #2198, K3 #3391,
LA3ZA Blog: http://la3za.blogspot.com,
LA3ZA Unofficial Guide to K2 modifications:
http://la3za.blogspot.com/p/la3za-unofficial-guide-to-elecraft-k2.html
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Here are the YouTube links to the ghostlight mod of John, WT5Y:
- K2 Backlight in Action http://www.youtube.com/watch?v=i3VJ4fSA2_Q
- K2 Backlight Details http://www.youtube.com/watch?v=AVWBGMMmT_A
-
Sverre, LA3ZA
K2 #2198, K3 #3391,
LA3ZA Blog: http://la3za.blogspot.com,
LA3ZA
My aging K2 (#2198) has developed a curious symptom in that the 4 MHz
oscillator cannot be adjusted lower than about 4,000,000.55 kHz. It has
probably been like this for a while and my BFO settings have probably been
done with the incorrect reference. I discovered it by observing that the
Sverre Holm (LA3ZA) wrote
My aging K2 (#2198) has developed a curious symptom in that the 4 MHz
oscillator cannot be adjusted lower than about 4,000,000.55 kHz.
This should be 550 Hz too high, that must be 4,000.55 kHz (I think!)
-
Sverre, LA3ZA
K2 #2198, K3 #3391,
LA3ZA Blog: http
Hi Don,
Thanks - heating up the soldering iron now!
- Sverre
-
Sverre, LA3ZA
K2 #2198, K3 #3391,
LA3ZA Blog: http://la3za.blogspot.com,
LA3ZA Unofficial Guide to K2 modifications:
http://la3za.blogspot.com/p/la3za-unofficial-guide-to-elecraft-k2.html
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Larry Lopez wrote
So you need a linear phase filter.
Is the DSP filter linear phase ?
I teach DSP and filters at the University of Oslo. Of the two DSP filter
types, FIR (Finite Impulse Response) and IIR (Infinite Impulse Response),
only an FIR filter can be designed to have exact linear phase
David Cole wrote
Does the K3 have a CW keyer memory? IE., can I program up a CQ TEST, in
one memory, then the 599 00X in the other?
The way the second part of the question is phrased it looks as if you are
asking if there is a memory that increments a counter per QSO, i.e. 599 001,
599 002,
Dave Hachadorian-2 wrote
I was on 10 Meters Saturday, when the X1 solar flare struck at 1748Z.
That must have been really fascinating - wish it were me. But like you I
would would probably also have forgotten to take a copy!
__
Hi Hans
You seem to have a known problem - with a known fix: Weird behavior around
7185 kHz. It is due to interaction between the VFO and the PLL reference
oscillator. Search for '7185' in my list
http://la3za.blogspot.no/p/la3za-unofficial-guide-to-elecraft-k2_5502.html
Phil Wheeler-2 wrote
Nice list you have, Sverre.
Thanks! Since August last year I have updated the list (link in my signature
field) and added several photos to make it easier to navigate.
-
Sverre, LA3ZA
K2 #2198, K3 #3391,
LA3ZA Blog: http://la3za.blogspot.com,
LA3ZA Unofficial
Apache Labs become the first Amateur Transceiver manufacturer to include
Pre-distortion technology within their PA’s for ultra-clean TX.
This is something that Elecraft should have all the possibilities to follow
up on: using the DSP to clean up the PA.
See http://blog.wsplc.com/?p=1701
I just wrote about storing macros for the PF1 and PF2 buttons on my blog, so
perhaps you will find it useful. There's a description there on how a button
can reprogram itself to toggle Split and related settings on/off .
See Clever K3 macro trick
You don't give so much information here about how you did the sidetone pitch
adjustment, but it is easy to mess up things if you do that without
adjusting filters also.
See item 3 in the list of 'Elecraft K2 do's and don'ts'
http://la3za.blogspot.no/2011/09/elecraft-k2-dos-and-donts.html
Larry,
Take a look at
http://la3za.blogspot.no/p/la3za-unofficial-guide-to-elecraft-k2_28.html#K2-tweak
- second item - which talks about various tricks to do with the T2 and T1
transformers. Lifting T2 helped me.
-
Sverre, LA3ZA
K2 #2198, K3 #3391,
LA3ZA Blog:
There is a study from 1992 that tested recognition rate vs pitch frequency.
Unfortunately only a few tones were tested, but at least one can infer that
a low tone is preferrable. This is in Montnemery, Peter, Bengt Almqvist, and
Sten Harris. Recognition of telegraphy signs at different listening
To sum up the interesting studies from the early 90's on Morse code
recognition and the effects of pitch frequency, signal to noise ratio and
code speed I posted the abstracts of some of the Montnemery papers on my
blog as well as some key illustrations.
See
There is an improved keying circuit which can be found here
http://la3za.blogspot.co.uk/p/la3za-unofficial-guide-to-elecraft-k2_28.html
http://la3za.blogspot.co.uk/p/la3za-unofficial-guide-to-elecraft-k2_28.html
by searching for WA5PB/N0SS. It was offered as a kit, but isn't any longer
since
You're welcome, Dennis - bare hyggelig!
(Your last name sounds to me as if you are among that approximate half of
people of Norwegian descent that live in the US rather than in Norway, and
thus perhaps would understand some Norwegian.)
Dennis L. Haarsager wrote
Recently LA3ZA posted here and
As your post indicates, the splattering of JT65 signals has most likely
nothing to do with your transmitter and setup. It is more likely to be due
to the specifics of the JT65 display/decoding algorithm than anything else.
I have done spectral estimation for some 30+ years and it reminds me very
I did this mod, and I recommend it, it really makes a difference for hardly
any effort. It is by the way the first mod for the K2 for years!
It has been added to the updated LA3ZA list of modifications:
http://la3za.blogspot.no/p/la3za-unofficial-guide-to-elecraft-k2_28.html#K2-misc
I wonder what resulted from this. I looked at it also and found that although
this high-capacity battery probably fits physically, it may not be a good
idea to put it inside the K2 due to the power switch and the indicator LED.
See image at e.g Aliexpress.com
Thanks Deni,
I listed your LiPo battery as an alternative on the LA3ZA Unofficial Guide
to Elecraft K2 Modifications under the KBT2
http://la3za.blogspot.no/p/la3za-unofficial-guide-to-elecraft-k2_28.html#KBT2
(scroll down a page or two)
-
Sverre, LA3ZA
K2 #2198, K3 #3391,
LA3ZA
Hi Björn,
You can also take a look at my Unofficial Guide to Elecraft K2
Modifications at the address
http://la3za.blogspot.no/p/la3za-unofficial-guide-to-elecraft-k2.html
http://la3za.blogspot.no/p/la3za-unofficial-guide-to-elecraft-k2.html .
It has a section describing the serial number
It is an advantage to use a Shottky diode for the auto-detect circuit and not
a standard silicon diode.
I've given the arguments for that here: Reliable auto-detect for keyer for
Elecraft K2
http://la3za.blogspot.no/2012/05/reliable-auto-detect-for-keyer-for.html
-
Sverre, LA3ZA
K2
My Elecraft K2 which is now more than 11 years old is still cosmetically in
mint condition, except for that single item which sticks out like a sore
thumb: The tuning knob.
I therefore ordered a new one and the difference is really striking. I feel
like I have a new K2 now, well worth the price!
. The display can
show them as small o, a, u with an overbar. Also show the a with ring as a
small a with an accent grave (falling bar) on top
2. Just show the unaccented characters
Sverre Holm (LA3ZA) wrote
---. = Ö (o with umlaut, two dots over o)
.-.- = Ä (a with umlaut, two dots over
The importance of accented letters probably varies from language to language,
but in Scandinavia we actually both learn and use the Ä, Ö, and Å in Morse
code, so that is the reason for my request.
I know this is different in e.g. written French where it seems like one may
actually chose to
I have recently started to have more Scandinavian CW QSOs and use the CW
decoder from time to time. But in the middle of many words it just shows a
big * due to a lack of some non-English characters.
Would it be possible to add four characters which would cover German,
Swedish, Finnish, and sort
I wonder if the concerns raised in Sept 2011 about this mod have been
addressed. At that time the mod generated additional mixer spurs into the
VHF range which Wayne, N6KR was concerned with. See link below
This is an interesting idea. But how is this, I have set up my K3 with the
main and sub for use as independent receivers in e.g. a DX pile-up. Don't I
then need to open the K3 and reconfigure/rewire it for use as a diversity
receiver?
-
Sverre, LA3ZA
K2 #2198, K3 #3391,
LA3ZA Blog:
If you want to make the circuit with two diodes for auto detection, then if
you have the possibility use Shottky diodes. This is especially so if you
also want to use an external keyer from time to time in addition to a
straight-key.
See Reliable auto-detect for keyer for Elecraft K2
This is the debunking saying that this is more or less a special case of MIMO
- Multiple Input Multiple Output - communications, i.e. using multiple
antennas on the rx and tx sides:
Is orbital angular momentum (OAM) based radio communication an unexploited
area? Ove Edfors and Anders J Johansson,
I have Gamma HPS-1a small switching supply which I use with my K2 + KPA100 as
an easily movable rig. I always use it to feed a ladderwire via a balun to a
nonresonant antenna. Therefore the feedline may pick up stuff very close to
the power supply (i.e. 1-2 m away).
I have noticed that on 15
Sverre Holm (LA3ZA) wrote
I always use it to feed a ladderwire via a balun to a nonresonant antenna.
This was a bit unclear. From the KAT100 a short coax goes to a balun, then
to the ladderwire which goes outside to the antenna.
-
Sverre, LA3ZA
K2 #2198, K3 #3391
LA3ZA Unofficial
I have experienced something similar and my impression is that it is the
noise blanker that sometimes needs some time to recover, but this is just my
gut feeling at the moment.
-
Sverre, LA3ZA
K2 #2198, K3 #3391
LA3ZA Unofficial Guide to K2 modifications
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Is there a possibility to program a P3 key to center the display on x.025
MHz?
I prefer to use the P3 in an overview mode with 50 kHz span covering from
e.g. 14.000 to 14.050 and then I zoom in using a span of 10 kHz during a
pile-up. As I go back to 50 kHz span, the center frequency changes to
Congratulations Martin and welcome among the K2 owners. Mine is now my second
rig as the K3 is my main home rig, but it is still a wonderful little rig
for travel with lots of performance.
-
Sverre, LA3ZA
K2 #2198, K3 #3391
LA3ZA Unofficial Guide to K2 modifications
--
View this message
Thanks Tom
The P3 utility's ability to copy the display of the P3 and make it into a
BMP-file is really nice for getting images like these, especially if the
interface is run at a high rate like 38400 bps.
Tommy Alderman wrote:
Very good images Sverre, thanks for putting them up!
-
We had nice aurora conditions here tonight and it was interesting to see how
the bandwidth of the CW signals had increased on the P3's display compared
to normal CW. See
http://la3za.blogspot.com/2011/08/aurora-50-mhz-and-electraft-p3.html
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