Re: [Elecraft] [K3] KAT3 not functioning on 6m

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, LA

Re: [Elecraft] Interesting QSO

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 https://la3za.blogspot.com/2013/10/studies-on-morse-code-recognit

Re: [Elecraft] Interesting QSO

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 https://la3za.blogspot.com/2013/10/studies-on-morse-code-recogni

Re: [Elecraft] K2 utility program

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, LA3Z

Re: [Elecraft] New K2 Build w/ Options

It is also very easy to make plug-in equivalents of the rework modules. In fact that’s where they started. And as said here, they will just contain jumpers or a couple of components. See http://la3za.blogspot.com/p/la3za-unofficial-guide-to-elecraft-k2_28.html#Access - Sverre, LA3ZA K2 #2

Re: [Elecraft] K3 port sharing and FT-8

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 -

Re: [Elecraft] IF Output ?

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 schemati

Re: [Elecraft] K3: Using a K3 to route antenna signals to external devices...

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 bo

Re: [Elecraft] K3: Using a K3 to route antenna signals to external devices...

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: http://la3za.blogspot.com/p/la3za-unofficial-guide-to-elec

Re: [Elecraft] K3: Using a K3 to route antenna signals to external devices...

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. - Sverre,

Re: [Elecraft] [K3] AGC White Paper

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 -- View this message in context: http://elecraft.365791.n2.nabble.com/K3

Re: [Elecraft] K3 and WSJT-X 1.7

Very interesting that you got "Split: Rig" to work. That setting never worked reliably for me in the past with WSJT-X 1.6, but a very brief test here also seems to indicate that it now works with version 1.7. And BTW congratulations with your JT65 QSO. I hope you found it worthwhile and will conti

Re: [Elecraft] K3 and WSJT-X 1.7

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 thi

Re: [Elecraft] K3 and WSJT-X 1.7

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: http://la3za.blogspo

[Elecraft] K3 and WSJT-X 1.7

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

Re: [Elecraft] P3 with K2?

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

Re: [Elecraft] P3 with K2?

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 b

Re: [Elecraft] [K3] K3EXREF not working

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, K

Re: [Elecraft] 80 Meter loop question

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 match

Re: [Elecraft] Rerouting the KRX3 AUX Input from the Rear BNC to the KAT3

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 ch

[Elecraft] Rerouting the KRX3 AUX Input from the Rear BNC to the KAT3

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 anothe

Re: [Elecraft] latest K2 serial #?

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

Re: [Elecraft] latest K2 serial #?

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 http://www.raunvis.hi.is/~matti/TF3MA/sidetone_tf3

[Elecraft] Someone took a fancy in our K3 and left their teeth marks

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 -- View this message in context: http:/

Re: [Elecraft] LDEs (Long-Delayed Echos)

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

Re: [Elecraft] What are your favorite K3 and KX3 macros?

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: http:

Re: [Elecraft] K2 Question: Is the DSP Board a Worthwhile upgrade?

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 up

Re: [Elecraft] (K3) filter setting shifts panadapter display

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)

Re: [Elecraft] Cheap ref osc to lock K3

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 solutio

Re: [Elecraft] (K3) filter setting shifts panadapter display

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 -

Re: [Elecraft] (K3) filter setting shifts panadapter display

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 ca

[Elecraft] Just good enough 10 MHz reference

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 fro

Re: [Elecraft] K3 Digital Voice Mode - our future?

- 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: http://elecraft.365791.n2.nabble.com/K3-Digital-Voice-Mode-our-fu

Re: [Elecraft] Frequency reference for the K3 directly off a GPS

e needs 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

Re: [Elecraft] Frequency reference for the K3 directly off a GPS

s. My 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 > additi

Re: [Elecraft] K3 Digital Voice Mode - our future?

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 co

Re: [Elecraft] Elecraft SP3 External Speaker details

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: http://la3za.blogspot.com/p/la3za-unofficial-guide-to-el

Re: [Elecraft] K3 Aux RF mod for Rx out (No Sub-Rx)

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 f

Re: [Elecraft] Frequency reference for the K3 directly off a GPS

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,

[Elecraft] Frequency reference for the K3 directly off a GPS

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 cyc

Re: [Elecraft] Removal of small K3 knobs

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 br

[Elecraft] Removal of small K3 knobs

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 t

Re: [Elecraft] Does the K3S DSP support LMS noise reduction ?

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 easil

Re: [Elecraft] K2 rework eliminators - mic board

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: http://la3za.blogspot.com

Re: [Elecraft] K3: Shifted audio image (L-MIX-R)

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: http://la3za.blogspot.com/p/la3za-u

[Elecraft] K3: Shifted audio image (L-MIX-R)

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

Re: [Elecraft] Elecraft] K3 K144XV spurious signal on 144,414.1

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 K

Re: [Elecraft] K3 K144XV spurious signal on 144,414.1

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 dow

Re: [Elecraft] K2 Settings Retrieval Software

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: > > http://elecraft.365791.n2.nabble.com/K2-Settings-Retrieval-S

Re: [Elecraft] K2 Settings Retrieval Software

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 bett

Re: [Elecraft] K2 Settings Retrieval Software

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 strug

[Elecraft] K2 Settings Retrieval Software

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 so

Re: [Elecraft] CW listening pitch

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 at

[Elecraft] Nifty manual for K2

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: h

Re: [Elecraft] K2 gettin' old.....

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

Re: [Elecraft] Getting Started With CW

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: http://la3za.blogspot.no

Re: [Elecraft] K3 External Frequency Reference Questions

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: http://la3za.blogspot.com/p/l

Re: [Elecraft] K3 External Frequency Reference Questions

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 one

[Elecraft] Double Oven OCXO

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: http://la3za.blogspot.com/p/la3za-unoffici

[Elecraft] K2 KPA100 fan replacement?

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: http://la3za.blogspot.com/p

Re: [Elecraft] Synchronized and stable GPS phase lock for KX3, K3 and XV transverters

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 muc

Re: [Elecraft] Auto Notch Revisited

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 com

Re: [Elecraft] Bluetooth Connection to K2

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

Re: [Elecraft] New k2 ghostlight mod!

Here are the YouTube links to the ghostlight mod of John, WT5Y: - K2 Backlight in Action - K2 Backlight Details - Sverre, LA3ZA K2 #2198, K3 #3391, LA3ZA Blog: http://la3za.blogspot.com, LA3ZA U

Re: [Elecraft] New k2 ghostlight mod!

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 -- View this message in context: http://elecraft.365791.n2.nabble.com/New-

Re: [Elecraft] How to outfit a K3 for JT65HF or JT9

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

Re: [Elecraft] 4 MHz oscillator is too high in frequency (K2)

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 -- View this message in context: htt

Re: [Elecraft] 4 MHz oscillator is too high in frequency (K2)

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, LA3Z

[Elecraft] 4 MHz oscillator is too high in frequency (K2)

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 indicated

Re: [Elecraft] Quick Question

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, a

Re: [Elecraft] Missed a great P3 Screen Shot

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! __ Elecraf

Re: [Elecraft] Distortion

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 Gu

Re: [Elecraft] Distortion

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

[Elecraft] PA with predistortion

"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

Re: [Elecraft] Storing Macros in K3

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" http://la3za.blogspot.no/2013/12/clever-k3-macro

Re: [Elecraft] K2 Signal to Noise on 160m ?

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 Jimith

Re: [Elecraft] K2 Low Power on 12 and 10 Meters

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: http://la3za.blogspot.com

Re: [Elecraft] CW Pitch Resolution

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 http://la3za.blogspot.no/2013/10/studi

Re: [Elecraft] CW Pitch Resolution

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 l

Re: [Elecraft] K2

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 by searching for "WA5PB/N0SS". It was offered as a kit, but isn't any longer since

Re: [Elecraft] KXPD3 and single-lever paddles

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 i

Re: [Elecraft] P3 Feature Request - Transmit sampling

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 mu

Re: [Elecraft] Simplest ever mod for K2

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

Re: [Elecraft] Modern battery for K2

Thanks Deni, I listed your LiPo battery as an alternative on the "LA3ZA Unofficial Guide to Elecraft K2 Modifications" under the KBT2 (scroll down a page or two) - Sverre, LA3ZA K2 #2198, K3 #3391, LA3ZA B

Re: [Elecraft] Modern battery for K2

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

Re: [Elecraft] Difference between K2 rev. A & B

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 . It has a section describing the serial number 3

Re: [Elecraft] [K2] Diode types for connecting both paddle & straight key

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 - Sverre, LA3ZA K2 #

[Elecraft] K2 Cosmetic Upgrade

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!

Re: [Elecraft] K3: CW decoder - minor sw request

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 include

Re: [Elecraft] K3: CW decoder - minor sw request

stead. 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

[Elecraft] K3: CW decoder - minor sw request

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 o

Re: [Elecraft] A Modified K3 in the 2013 ARRL DX Contest

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 http://elecraft.365791.n2.nabble.com/quot-K3-test-w-o-amp-w-I7SWX-2T-FSA3157-H-Mode-Mixer-t

Re: [Elecraft] Diversity receive w/o dedicated receive antenna

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: http://la3

Re: [Elecraft] K2-Using a paddle and straight key at the same time….how?

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" http://la

Re: [Elecraft] OT: Distinguishable angular momentum in radio photons?

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

Re: [Elecraft] Gamma P/S

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 U

Re: [Elecraft] Gamma P/S

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 meter

Re: [Elecraft] De-sensed K3 after xmit

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 -- View this message in context: htt

[Elecraft] [K3] P3 command to center display on CW band

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 w

Re: [Elecraft] How many are still building K2's?

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 in

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