Re: [Elecraft] KX3 SDR

Another free online DSP book, that I stumbled upon this evening is Signal Processing for Communications. I have not gone much past the table of contents, but it looks interesting. http://www.signalprocessingforcommunications.org/

Re: [Elecraft] K3 Transmitting CW in SSB mode

Exactly Grant. Many of the early SSB rigs were basically SSB-only. So adding a tone to the SSB signal was the simplest way to send "cw". But the opposite sideband suppression is never perfect - too often far from it. That was no big deal back when over half of the signals on a "phone" band were

Re: [Elecraft] KX3 SDR

Hi Enzo, I'd recommend that you look at some of the Raspberry Pi / Elecraft KX3 panadapters, http://twitter.com/giorgiofox/status/694969541521207296 https://github.com/Giorgiofox/panadapter 73's Joe Stone KF5WBO -- View this message in context:

Re: [Elecraft] KX3 SDR

HiI have little experience in demodulation of the signals but I did do SSB and AM at one time. Basically once you have the samples in the fre1uency domain you will want to apply a bandpass filters and shift it down to baseband,  do an inverse fft and then a Hilbert transform to demodulate the

Re: [Elecraft] KX3 SDR

The signals at the IQ jack on the KX3 are analog, not digital. They are centered approximately 8 kHz away from the dial frequency as the KX3 uses an internal offset of 8 kHz. Depending on the firmware release and user settable options, that offset may be on either side of the center of the IQ

Re: [Elecraft] KX3 SDR

Hi Yes, well I have used those in the past, hence my confusion, when I see bandwith of a SDR at lets say 24Khz and I am sampling at 48Khz. Does that mean I am sampling the whole bandwith of 24Khz centered on freq X, or am I a sampling some point Y at +/- from the center frequency. I am trying to

Re: [Elecraft] Cleaning a K3

Dick, That was possible, and done commonly back in the old days of vacuum tube gear with open inductors and not too much else to be harmed by the water (once dried out), it worked just fine as long as lubricants were added to things like capacitor shafts after the 'washing'. Today with ICs

Re: [Elecraft] Cleaning a K3

Looks like we have beaten this one to death. ;-) Time to end the thread. In general, please self moderate (limiting the number of posts on a topic) and do not wait for me to jump in, as I can get busy or may be out of town when these long threads occur. 73, Eric Moderator (hopefully not

Re: [Elecraft] KX3 SDR

If you are writing your own software, you will have to become proficient in Digital Signal Processing. The I and Q signals are simply baseband signals that are 90 degrees out of phase - by themselves, they will do nothing but audio signals, but with DSP processing, they can do most anything

Re: [Elecraft] Cleaning a K3

I read about guys whose rigs were flooded a few years back, and they washed them in water and dried them somehow. Said they worked fine after that. Hard to imagine though. Dick, n0ce On 7/27/2016 1:15 PM, Fred Jensen wrote: My S3-line acquired a chronic case of creeping fungus on the

Re: [Elecraft] KX3 SDR

Hi Tom I never thought it was simple :) I am just trying to understand what is going on, so given by what you've said I would push the IQ data coming from the KX3 into an FFT, that FFT would then produce the circular buffer that would let me analyse what signals are in that band? But this

Re: [Elecraft] KX3 SDR

Hi It's not that simple Basically you take the I and q signals, sample them with the sound card, convert them to a complex number, pop them  in a fast Fourier transform, do a rectangular to polar conversion and then calculate the magnitude in dBm.  Then plot them. There's a few more nuances but

[Elecraft] KX3 SDR

Hi All Yes this topic might be a little bit more complicated than the title suggest. So I have the KX3 plugged into the audio input of my computer, and its sending quadrature data (IQ) to the sound card, the sound card samples at 96Khz. So my question is how I process this? Yes I know use a

Re: [Elecraft] [KX3] Bioment 11.1V 2600 mAH battery pack

Fortunately you can use the cheap batteries external to the KX2, connected by several hundred feet of wire. On 7/27/16 4:01 PM, Dkabell dkab...@gmail.com [KX3] wrote: I agree! I continue to be amazed to see discussions about cheap battery solutions by people who have purchased relatively

Re: [Elecraft] K2100 and KAT100 Question and a side note about Alaska

Ted, Can't tell you how often folks with lower-48 experience expect to take a vacation in late August or September during "the cooler sunny fall months". Maybe where you live its like that in August-September but in southcentral and southeast Alaska its time for the fall monsoons. Summer

Re: [Elecraft] Cleaning a K3

I remember the good old days when it was rosin flux and Freon TF in a vapor degreaser :-) Then my employer (Hughes) invented "lemon juice" flux as we called it, and gave away the patent. On 7/27/2016 2:11 PM, Clay Autery wrote: As I originally said, "NOT recommending this because it

Re: [Elecraft] K3 Transmitting CW in SSB mode

Actually, I believe the frequency shift is done in the MCU firmware. Control of the synthesizers is what is needed. Those "few lines of code" can be problematic (not with what is intended, but other aspects that it interfered with) - that is why the firmware is tested in-house (or by a few

Re: [Elecraft] Cleaning a K3

You may want to note that Elecraft does not recommend cleaning flux at all. Those working in support and repair for the thru-hole legacy line may see a board we have to work on that is so covered with flux residue that it has to be removed. Even then, we work with cotton swabs in a small area

Re: [Elecraft] K3 Transmitting CW in SSB mode

It's just a"few lines of code" ;) All done in DSP most likely. Simpler than doing the same thing in an analog radio. Grant NQ5T Sent from my iPhone > On Jul 27, 2016, at 5:22 PM, George Kidder wrote: > > Thanks, Don. Harder to implement, but safer. > > George > >

Re: [Elecraft] K3 Transmitting CW in SSB mode

Thanks, Don. Harder to implement, but safer. George On 7/27/2016 2:39 PM, Don Wilhelm wrote: George, The K3/K3S does *not* inject an audio tone. It shifts the transmit carrier by an amount equal to your sidetone pitch. Lower if you are on LSB and higher if you are on USB. The effect is the

Re: [Elecraft] Cleaning a K3

As I originally said, "NOT recommending this because it requires a great deal of care/experience"... I use 99% Iso. Alcohol when necessary. And I'm not saying to flood the board with it. Also not saying to get it near enclosed components... One should use proper instruments and care when

Re: [Elecraft] Cleaning a K3

Be careful using isopropyl alcohol.   You don't want the dissolved Flux flowing inside switches and under components.  Then the alcohol evaporates and the Flux stays inside. .not good. This is why the industry has largely switched to  no clean flux.  Just leave it alone. Of course you

Re: [Elecraft] Cleaning a K3

Josh is exactly correct, DI is the standard.   Surfactants are sometimes added to increase the wetting on the board and reduce the surface tension. I think that distilled water, under the right conditions is actually corrosive.  73Gary K9GS Original message From:

Re: [Elecraft] Cleaning a K3

In a production environment, acid flux is almost universal. Rosin flux requires solvents and the local air pollution cops watch you very closely. The solvents are more likely to damage components than water. A proper wave soldering system does a great job of displacing the flux, and water

Re: [Elecraft] Power has disappeared

Thanks, Bill. 1. The rig is a K3S(100)-F which I received last Tuesday, 19 July. It has both the antenna tuner and the general coverage option on the one and only receiver. 2. The rig has the antenna tuner and the dummy load is on antenna 2. It matches my existing K2/KAT/KPA connections, so

Re: [Elecraft] Cleaning a K3

DI water is the standard, usually in a closed loop system. Most process now use water soluble flux. If not, sometimes a wash with addition of soap and/or solvent is done prior to the DI water rinsing. 73, Josh W6XU On 7/27/2016 11:15 AM, Fred Jensen wrote: circuit boards used to be washed

Re: [Elecraft] Cleaning a K3

If you are going to use a compressor, use a moisture/condensate trap like you would use with a paint spray gun. Those air tanks get full of water. And yes, of course keep the pressure way down!! Russ KD4JO -Original Message- From: Elecraft [mailto:elecraft-boun...@mailman.qth.net] On

Re: [Elecraft] Power has disappeared

Couple questions: 1) What radio, K3 or K3S, or K2/100? 2) which antenna, 1 or 2? 3) You said you turned the “temps down to a more reasonable 23C…” I don’t recall a temp setting, only a REF to current room temperature calibration step. 4) What is the voltage shown on the front panel display?

Re: [Elecraft] Cleaning a K3

I will second Dick's caution of using any high pressure air or gas. The high flow rates can cause static charge buildup on higher impedance parts, causing over-voltage failures. Keep the flow rate and pressure lowdo not use an air compressor hose. The static buildup can happen no matter

Re: [Elecraft] comparing P3, LP-Pan, SDRPlay, others?

Although I really like using a panadapter, which I made from a Softrock Lite II for $21.00 and an external USB sound card for about $50.00, it was a lot of fun using my K1 during a recent NAQCC sprint. Panadapters are nice, but not absolutely necessary in my opinion. 73, Art WB8ENE On Wed, Jul

Re: [Elecraft] [OT] Off Shore RF amplifiers

Rick, You are correct, an amplifier without low pass filtering will generate harmonics - unless it is a *very* expensive instrumentation amplifier - you might find one in a test lab, but most likely not in a ham station. It is not legal to *sell* those kind of amplifiers in the US (and I

Re: [Elecraft] K3 Transmitting CW in SSB mode

George, The K3/K3S does *not* inject an audio tone. It shifts the transmit carrier by an amount equal to your sidetone pitch. Lower if you are on LSB and higher if you are on USB. The effect is the same as adding a tone to a perfectly suppressed carrier, but is guaranteed to be clean. 73,

Re: [Elecraft] K3 Transmitting CW in SSB mode

Another way to look at the use of CW in SSB mode on the K3: What I think the rig does when you hit the key is inject an audio tone at the CW offset frequency into the audio chain for the SSB signal. If all is clean and not distorted, the result will be a single RF frequency offset from the

Re: [Elecraft] Cleaning a K3

99% Isopropyl alcohol is the approved solvent for getting flux, et al off boards... It evaps rapidly and is water soluble... __ Clay Autery, KY5G MONTAC Enterprises (318) 518-1389 On 7/27/2016 1:15 PM, Fred Jensen wrote: > My S3-line acquired a chronic case of creeping

[Elecraft] [OT] Off Shore RF amplifiers

First of all, I'm NOT entertaining purchasing one, I'm happy with my 100W K3. I've been away from the hobby for a while and I'm catching up on a few things. I'm noticing quite a few add on amplifiers targeting the portable crowd on the auction site. Most are originating from China. Many show an

Re: [Elecraft] Cleaning a K3

My S3-line acquired a chronic case of creeping fungus on the chassis while packed up and stored in the Philippines for 4 years. Returning home, I took it to the DIY car wash a couple of times and then dried it in the sun. Seemed to work really well, except for the fungi living in the IF

Re: [Elecraft] Power has disappeared, additional info, part 2.

The relative currents indicate little if any drive. I would begin to suspect a failure in the predriver. > I'll contact Elecraft to see what they recommend. I think that's your best bet given the symptoms and the fact that you have a week old factory assembled rig. 73, ... Joe, W4TV On

Re: [Elecraft] comparing P3, LP-Pan, SDRPlay, others?

I love my P3. I've been a ham for 36 years (active for all of them). I've had my P3 for over a year and a half and simply don't know how I ever lived without it. Mike - KI8R On Wed, Jul 27, 2016 at 11:30 AM, Ramon Tristani wrote: > Jim: > > How can you enjoy a radio

Re: [Elecraft] comparing P3, LP-Pan, SDRPlay, others?

When I was trying to work my friend Ned, AA7A, operating RTTY at VP8STI I was looking for his pattern. It took about an hour to figure out that he didn't have one! I finally stuck to one frequency and he eventually found me. When I saw him later I mentioned it and he confirmed that after each

Re: [Elecraft] comparing P3, LP-Pan, SDRPlay, others?

I use an SDR-IQ and SpectraVue software* to look at the K3 IF output. The software has a K3 interface option built in that knows all of the frequency offsets between modes and tracks the K3 center frequency perfectly and seamlessly. You can tune the K3 with the mouse wheel or point and click.

Re: [Elecraft] Elecraft grey in a rattle can?

A few years ago I had Superior Paint Supply in SLC make me a rattle-can of paint that matched the front panel on a PDP11 that I was restoring. As I recall it wasn't more than 20 or 30$. I also bought two types primers, one etching and one non-etching. I was really happy with the result. The

Re: [Elecraft] comparing P3, LP-Pan, SDRPlay, others?

The P3 is excellent for HF but its "point and click" facility is far too slow to catch fleeting openings on 6m. To keep watch on the 6m beacons, CW and SSB requires a frequency span of at least 200kHz - and wherever a station may appear, you need to jump onto that frequency *immediately*. For a

Re: [Elecraft] comparing P3, LP-Pan, SDRPlay, others?

Never used an LP-Pan, but it appears to be a sweet instrument and lots of folks like it. I have a P3 w/ SVGA option (will add TXMON soon). IMHO, a panadapter is no longer optional. I use it every time I am on the radio... regardless of the band. I use it to monitor a band segment when running

Re: [Elecraft] Cleaning a K3

Cleaning a REALLY dusty unit is always better to VACUUM with a static protected unit with a HEPA filter FIRST... Then, blow out what you can't reach with a vacuum second (outside), preferably with the chassis completely open. NOT recommending this because it requires a great deal of

Re: [Elecraft] comparing P3, LP-Pan, SDRPlay, others?

Not all pan-adapters are created equal. Some suggestions; Compare the images of one to another. Look for images that are sluggish and exhibit a delay between what is heard and what is seen due to the computer involved. Also look for false images that are mirrored, etc. (That may take

Re: [Elecraft] comparing P3, LP-Pan, SDRPlay, others?

Premise: It is more enjoyable working them than not-- the quicker the better. Let's face it DXing is a competitive undertaking. Besides power and antenna dB's, there is another "space race" war going on. Technology has equipped many station with panadapters of some sort. They have proved so

Re: [Elecraft] Power has disappeared

I apologize for this, but being it's a new rig it has to be said; could there be any confusion in the antenna jack selection? I haven't followed how it is equipped. Dick, n0ce On 7/26/2016 7:48 PM, Chris Kimball wrote: I'm a new owner and all worked fine. After an absence of a few days I

Re: [Elecraft] comparing P3, LP-Pan, SDRPlay, others?

Jim: How can you enjoy a radio without a pan adapter or spectrum display nowadays? After using the P3 for close to six years, I would never even consider a radio without something with that functionality. Still thinking about it? Hello, just don’t think anymore. Just use the plastic and enjoy

Re: [Elecraft] comparing P3, LP-Pan, SDRPlay, others?

Absolutely agree with Stewart. 73, Guy K2AV. On Wednesday, July 27, 2016, Stewart Bryant wrote: > > > On 27/07/2016 16:05, knowk...@verizon.net wrote: > >> I have yet to be convinced I need a panadapter for HF >> > > It is very useful for search and pounce operation in

Re: [Elecraft] comparing P3, LP-Pan, SDRPlay, others?

On 27/07/2016 16:05, knowk...@verizon.net wrote: I have yet to be convinced I need a panadapter for HF It is very useful for search and pounce operation in contests, and for finding a slot to call CQ. It is also useful for understanding the shape of a DX pileup. I find that it helps

[Elecraft] comparing P3, LP-Pan, SDRPlay, others?

Greetings, I have yet to be convinced I need a panadapter for HF but its use for weak signal 6m use is what has my attention. That said, I have seen the P3 and an LP-Pan demonstrated but nothing else. I realize I am probably trying to compare apples to oranges but how do these stack up

Re: [Elecraft] Power has disappeared, additional info, part 2.

Alas, I don't have a wattmeter in the shack. So I can't answer Joe's question 1. The current drains are: Receive: 1.02 Transmit 10W: 2.74 Transmit 50W: 2.73 The rig is factory built and arrived only last week. I've never opened it up as I have no static protection gear. The rig doesn't

Re: [Elecraft] Cleaning a K3

Be careful if using a vacuum cleaner. A static build-up can develop. I have seen it cause arcing. That may have been a hose with metal fittings. There is also a metal spring inside the hose that can conduct. Perhaps an attachment with a brush for the hose will avoid a discharge. Dick, n0ce

Re: [Elecraft] Power has disappeared, additional info, part 3.

K6MKF suggested I run the Calibrate Transmitter Gain function from K3 Utility. The rig failed at both the 5 and 50W levels because the output was inadequate. I think it may be a hardware problem. Operator ineptitude is still a possibility! -- View this message in context:

Re: [Elecraft] Power has disappeared, additional info, part 2.

Have you tried an external wattmeter to check for power output? When you make your tests, have you looked at the current draw (use the internal current measuring capability)? What is the current with the rig set to high power (100W) and low power (10W)? Have you checked the hardware on the

Re: [Elecraft] Power has disappeared, additional info, part 2.

Thanks for the comments. The rig is NOT in the TEST mode, that is, the display TX is not flashing. Holding the TEST mode produces informative messages in the VFO B area both on turn on and turn off. I'm not certain that the TEST mode produces ANY indication at all in the RF scale. I've

Re: [Elecraft] KX-2 well alrighty then!

Dayton is on the list for next year! Jim GM wrote: >That’s just great! > >Next thing to do is to work on getting her to say Go with the guys to Dayton >and buy what ever you want! > >Cheers  > >Jim K9TF > >__

Re: [Elecraft] Power has disappeared, additional info.

Hi Chris It sounds as if you have put the rig into Test mode - the middle button on the far left of the front panel. Barry VK2BJ On 27 July 2016 at 21:34, Chris Kimball wrote: > Thanks to all who responded. Alas, the problem continues. > > Let me respond to the queries

Re: [Elecraft] KX-2 well alrighty then!

That’s just great! Next thing to do is to work on getting her to say Go with the guys to Dayton and buy what ever you want! Cheers  Jim K9TF __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help:

[Elecraft] Power has disappeared, additional info.

Thanks to all who responded. Alas, the problem continues. Let me respond to the queries to date: 1. The rig is a recent K3S (100W). 2. The KPAT is on, "PA nor". 3. The circuit breaker seems fine. No red showing on button, button feels loose. 4. Operation is into a dummy load, without

Re: [Elecraft] Cleaning a K3

Hi Bill, the same what suggested Vic, the pressed air gun (like reverse-connected vacuum cleaner tool) to blow the dust out I am using in our company for rough cleaning of the testing equipment time to time. Important things are to protect fans (as Vic mentioned too) from the over-spining.

Re: [Elecraft] Cleaning a K3

I always cleaned computers (I worked for an agricultural software company and some of our customers' computers could have had crops planted in them) with a reverse-connected vacuum cleaner to blow the dust out. This must be done outdoors, of course! You need to be careful not to spin fans with

[Elecraft] Cleaning a K3

My K3 (and P3) were used in a very dusty environment in eastern Nevada. Some people there compared the dust levels to those at burning man. Does anyone have any advice about cleaning the equipment? 73 Bill AE6JV --- Bill

Re: [Elecraft] [KX3] Headphones for KX2/KX3 for Single sided deafness

As another ham who is deaf in one ear (although I was in my 50s when it happened), I was wondering if I am out of luck when it comes to the dual watch function of the KX2. Bob, N7XY On 7/26/16 3:50 PM, Don Wilhelm donw...@embarqmail.com [KX3] wrote: Joe, I suggest that you are looking at