Re: [Elecraft] Chrome OS and Elecraft Utilities
Don't confuse Chrome OS with the Chrome browser. They're very different things. The latest Pixelbooks should be able to run Android apps natively, but if you need to, you can use one of the tools like Crouton to enable running Linux. I do that with my older Chromebook. On Fri, Nov 30, 2018 at 9:06 PM W2xj wrote: > Pretty much everything works with Chrome. > > Sent from my iPhone > > > On Nov 30, 2018, at 17:58, Dauer, Edward wrote: > > > > Anyone know if Elecraft utilities can be made to run on a Chrome OS? > The reviews I have been reading about the Google Pixelbook make it seem > attractive. > > > > Ted, KN1CBR > > > > __ > > Elecraft mailing list > > Home: http://mailman.qth.net/mailman/listinfo/elecraft > > Help: http://mailman.qth.net/mmfaq.htm > > Post: mailto:Elecraft@mailman.qth.net > > > > This list hosted by: http://www.qsl.net > > Please help support this email list: http://www.qsl.net/donate.html > > Message delivered to w...@w2xj.net > > > > __ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:Elecraft@mailman.qth.net > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > Message delivered to ard...@gmail.com > -- -+-+-+-+- Jenny Everywhere's Infinite: Quark Time http://quarktime.net __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] Chrome OS and Elecraft Utilities
Pretty much everything works with Chrome. Sent from my iPhone > On Nov 30, 2018, at 17:58, Dauer, Edward wrote: > > Anyone know if Elecraft utilities can be made to run on a Chrome OS? The > reviews I have been reading about the Google Pixelbook make it seem > attractive. > > Ted, KN1CBR > > __ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:Elecraft@mailman.qth.net > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > Message delivered to w...@w2xj.net > __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
[Elecraft] Chrome OS and Elecraft Utilities
Anyone know if Elecraft utilities can be made to run on a Chrome OS? The reviews I have been reading about the Google Pixelbook make it seem attractive. Ted, KN1CBR __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
[Elecraft] K3 power level question
Is there a way to limit a K3 to, for example, 25 watts via it’s firmware. (Not an attenuator pad). I am familiar with the Tune function which works FB. I am referring to setting the max TX output to s designated value like 30 watts. Pls respond directly to me (k...@aol.com) or via the reflector if your reply is of general interest. Thanks, Philip KT3Y __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] KAT500 investigation results (WAS KPA-1500 issues)
"As far as calculating bin size, I suspect that K3WYC’s solution of sending FA; response frequencies into the KAT500’s serial port might actually yield a better solution since those frequencies can have 1KHz (or better) resolution. In this case the relays should switch very close to the actual boundary instead of at 8KHz boundaries. What I don’t know is if the KAT500 uses RF counted frequency for its bin determination or if it can use the externally reported frequency. I suspect it is the former." Not quite how I implemented the frequency interface. What I do is use the values of IF, FA , and FB to determine the frequency my TS-590 would transmit on if it went into TX at that instant. This calculation to done each time I get a new value of IF, or FA, or FB. I send that frequency value to the KAT500 using the F command but I only send it if the calculated transmit frequency differs from the KAT500 last observed frequency by more than 8 kHz. Sending the raw FA value to the KAT500 is not a useful solution for several reasons - The TS-590 may not be using VFO A for RX or TX; if the TS-590 is using VFO A then FA alone is not enough information to know if A is the TX or RX VFO for split; Even if A is the TX VFO, FA does not include XIT offset; FA is not meaningful for memory channel operation; etc. ) The KAT500 follows the TX frequency I send it and sets the proper tuning solution for that frequency with no RF transmission required. The only issue with my implementation is that RF detection can override the frequency I provided and move it to an adjacent, incorrect or less accurate, value. The fact that the last observed frequency is changed by RF does not necessarily mean a new tuning solution will be selected. That depends on how the 8 kHz increments of last observed frequency overlay the tuning segment boundaries (and other factors that are likely Elecraft proprietary). 73, Andy k3wyc __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] KPA500 Fan Control
Normally, I don't use my KPA500, as I like to run the low power status in contests. BUT, when I do kick in the amplifier, I immediately set the fan level to 5, if it's going to be an extended period of operation. The amp is located about 1 foot above and 4 feet away from my head, I use RadioSport headphones, and with them on, the fans could be doing a screaming banshee song and I never hear a thing. Your mileage may vary, just my observations over a several year period. 73 de Jim - KE8G http://www.avg.com/email-signature?utm_medium=email_source=link_campaign=sig-email_content=webmail; target="_blank">https://ipmcdn.avast.com/images/icons/icon-envelope-tick-green-avg-v1.png; alt="" width="46" height="29" style="width: 46px; height: 29px;" /> Virus-free. http://www.avg.com/email-signature?utm_medium=email_source=link_campaign=sig-email_content=webmail; target="_blank" style="color: #4453ea;">www.avg.com On 11/30/18, Bob McGraw K4TAX wrote: > John et al: > > With my KPA500 and SSB rag chews I keep the fan on NORMAL. It does > cycle on and up from time to time. When operating digital modes at 400 > to 500 watts, I set the fan to 1. It still does move to higher speeds > during transmissions as the TEMP gets to 60 degrees or so. Then drops > back to level 1. As to operating at 2, other than the amount of added > noise and a bit of wear, I see little disadvantage or advantage for that > matter. At the same time, I agree that heat is the most damaging > component to solid state devices. > > By the way, as my amp fan is about 4" from the wall behind it, adding > some acoustic material on the wall behind the amp I find soaks up some > of the noise. > > 73 > > Bob, K4TAX > > > On 11/30/2018 9:30 AM, Monkeys wrote: >> Is there any harm in setting the fan at level 2 and just leaving it >> there? I would think the fan might wear out a little faster, but how >> much faster? The reason I ask is that when the fan control is set to >> NOR I find that the fan eventually...and understandably... kicks into >> a super high speed whine on extended CW ragchews. But I have found by >> setting the fan control to 2, the amp seems to like this 'pro-active' >> cooling. I can ragchew to my heart's content and it never goes into >> that high speed jet-taking-off or vacuum cleaner level. Has anyone >> else changed their fan from NOR to 2 as a default and experienced any >> side effects? >> >> John K7FD >> >> __ >> Elecraft mailing list >> Home: http://mailman.qth.net/mailman/listinfo/elecraft >> Help: http://mailman.qth.net/mmfaq.htm >> Post: mailto:Elecraft@mailman.qth.net >> >> This list hosted by: http://www.qsl.net >> Please help support this email list: http://www.qsl.net/donate.html >> Message delivered to rmcg...@blomand.net >> > > > __ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:Elecraft@mailman.qth.net > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > Message delivered to ke8g@gmail.com __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] External AMP
No. There is no power source in the ACC connector from the K3. Your use of the 12V connector is the right solution. Jack, W6FB > On Nov 30, 2018, at 7:02 AM, Raymond wrote: > > I am using my ancient Heathkit SB 230 (original tube) with my K3s. Is there a > way to get 12 volts out of acc connector to power relay? Using K3 external > plug for P3 power. > Ray > W8LYJ > > Sent from my iPhone > __ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:Elecraft@mailman.qth.net > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > Message delivered to jackbrin...@me.com __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] KAT500 investigation results (WAS KPA-1500 issues)
Randy; The resolution of the frequency being reported from the K3 to the KAT500 is 8 KHz. This probably does a better job explaining why the relays switch every 8 KHz than bin size. I would bet that once in a while you will find two adjacent frequency segments that fall in the same bin, and no change occurs. I also suspect that the RF frequency count resolution is 8 KHz (as it is in the KPA500), which will show similar frequencies when transmitting. When operating the KAT500 with the K3/K3S, we usually have the K3 tell the KAT its current frequency, which is why it switches during receive and on 8 KHz boundaries. I sympathize with you on the water issues. We see a lot of that kind of problem. My “favorite” is the right-angle coax adapter (this one bit me). The cheaper ones do a poor job of constraining the inner conductor, and at high power will arc to ground. I changed out all my adapters for good ones (read: more expensive), and no longer have the issue. Figuring out the problem is usually rather difficult since you can’t actually see the arc results because they are inside an enclosure. You are lucky to find your issue so easily, but then water intrusion is a bit more obvious. As far as calculating bin size, I suspect that K3WYC’s solution of sending FA; response frequencies into the KAT500’s serial port might actually yield a better solution since those frequencies can have 1KHz (or better) resolution. In this case the relays should switch very close to the actual boundary instead of at 8KHz boundaries. What I don’t know is if the KAT500 uses RF counted frequency for its bin determination or if it can use the externally reported frequency. I suspect it is the former. Glad you found the issue. Perhaps you now might find a way to lower the antenna Q to require fewer bins (and perhaps wider bandwidth), but it is good to know the KAT is providing a solution for your antenna the way it is (well, without the water). 73! Jack, W6FB > On Nov 30, 2018, at 11:01 AM, Randy Farmer wrote: > > First things first: My key line connections are correct. A little bit of > trial and error with the amp on on 160 meters shows that the intermittent > high VSWR faults I was encountering were due to a "feature" of my antenna > system. Apparently there is water in the FCP transformer box or a bad coax > cable that was causing an intermittent arc or other breakdown at high power. > The problem is much worse at the high end of the band, where the antenna VSWR > is higher (imagine that!). > > All of this led me to spend a couple of hours investigating what the KAT500 > was actually doing on 160 meters. It turns out that, despite what the manual > says, the tuning bins on 160, and presumably everywhere below 3 MHz, are > actually 8 kHz wide, not 10 kHz. This was verified by slowly tuning the radio > and listening to the presets changing. My 160 antenna has a VSWR that changes > rapidly enough as a function of frequency that most every bin had a slightly > different tuning solution. This made it possible to see the bin boundaries > across most of the band. The bins start at 1800 kHz and are spaced exactly > every 8 kHz. Tuning slowly with fine tuning engaged it can be seen that, for > example, when the radio is tuned from 1807.999 to 1808.000 kHz the KAT will > change to the next preset. I re-trained the tuner by tuning to the center of > each bin: 1804, 1812, 1816... all across the band and executing a "Tune" > operation at each frequency. > > I had always wondered why the KAT utility reported frequency values that were > frequently quite different from the actual transmit frequency. It turns out > that the "Observed Frequency" value displayed in the utility Operate window > is the low end of the particular tuning bin that has been selected by the > selection algorithm. 1836 reports as 1832, for example. Since my antennas for > 80 meters and higher are not extremely high Q, it would be difficult to do a > similar experiment to determine what the actual tuning bin widths are on the > higher frequency ranges. > > I realize this behavior may be of academic interest only, since the firmware > does seem to do a good job of selecting the appropriate tuning solution, but > for a very high Q antenna such as is frequently found on 160 and/or highly > compromised shortened antennas for other HF bands it could be important. It > would be nice if the Elecraft folks would correct the manual to show what the > actual tuning bin widths are for each range. > > 73... > Randy, W8FN > >> On 11/29/2018 8:48 PM, Don Wilhelm wrote: >>> Randy, >>> >>> That indicates that you do not have your KAT500 and amplifier properly >>> connected. >>> >>> The KEYOUT line from the transceiver should go first to the KAT500, and >>> then from the KAT500 to the amplifier. >>> When the KAT500 needs to tune, the amplifier will not be keyed and tuning >>> will take place at the power output of the
Re: [Elecraft] External AMP
How many Amps does it draw? The external port can supply 1 AMP. The P3 between .5 and .75 A. (Depending on SVGA & TX-MON installed). If you don’t need more than .250 or so you can use a simple RCA>RCA/RCA splitter. Sent from my iPhone ...nr4c. bill > On Nov 30, 2018, at 10:02 AM, Raymond wrote: > > I am using my ancient Heathkit SB 230 (original tube) with my K3s. Is there a > way to get 12 volts out of acc connector to power relay? Using K3 external > plug for P3 power. > Ray > W8LYJ > > Sent from my iPhone > __ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:Elecraft@mailman.qth.net > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > Message delivered to n...@widomaker.com __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
[Elecraft] KAT500 investigation results (WAS KPA-1500 issues)
"I had always wondered why the KAT utility reported frequency values that were frequently quite different from the actual transmit frequency. It turns out that the "Observed Frequency" value displayed in the utility Operate window is the low end of the particular tuning bin that has been selected by the selection algorithm. " I don't think that is correct. From my experimental observations I believe the last observed frequency (the value returned by the F; interrogation) is the most recent value of F received over the serial interface unless that value has been changed to a more recent RF detected frequency. RF detected frequency has a resolution of 8 kHz which may or may not match the size of a tuning segment. (There is an exception to this though - If the last value of F received over the serial interface caused a KAT500 band change then the last observed frequency will be stuck at zero until another F transmission is made or until an RF transmission is made . This anomaly has been reported to Elecraft and it's "on the list") The behavior of last observed frequency does not change if the KAT500 is in bypass mode where no tuning solution is being selected. it is my understanding that the KAT500, when connected to a K3, actually tracks the K3 receive frequency not the transmit frequency. My TS-590 Elecraft interface gives the KAT500 the calculated transmit frequency not the receive frequency which seems to me to be a better implementation. ( I had enough problems with my SteppIR retuning at the start of a split TX to want to play the same games with my KAT500 and KPA500) Andy, k3wyc __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] SWR - Numerical Indication
"If the holes were closely spaced, but far from the bulls-eye, the shooter was inaccurate but precise." I would suggest that this is an indicator of repeatability not precision. Andy, k3wyc __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
[Elecraft] KAT500 investigation results (WAS KPA-1500 issues)
First things first: My key line connections are correct. A little bit of trial and error with the amp on on 160 meters shows that the intermittent high VSWR faults I was encountering were due to a "feature" of my antenna system. Apparently there is water in the FCP transformer box or a bad coax cable that was causing an intermittent arc or other breakdown at high power. The problem is much worse at the high end of the band, where the antenna VSWR is higher (imagine that!). All of this led me to spend a couple of hours investigating what the KAT500 was actually doing on 160 meters. It turns out that, despite what the manual says, the tuning bins on 160, and presumably everywhere below 3 MHz, are actually 8 kHz wide, not 10 kHz. This was verified by slowly tuning the radio and listening to the presets changing. My 160 antenna has a VSWR that changes rapidly enough as a function of frequency that most every bin had a slightly different tuning solution. This made it possible to see the bin boundaries across most of the band. The bins start at 1800 kHz and are spaced exactly every 8 kHz. Tuning slowly with fine tuning engaged it can be seen that, for example, when the radio is tuned from 1807.999 to 1808.000 kHz the KAT will change to the next preset. I re-trained the tuner by tuning to the center of each bin: 1804, 1812, 1816... all across the band and executing a "Tune" operation at each frequency. I had always wondered why the KAT utility reported frequency values that were frequently quite different from the actual transmit frequency. It turns out that the "Observed Frequency" value displayed in the utility Operate window is the low end of the particular tuning bin that has been selected by the selection algorithm. 1836 reports as 1832, for example. Since my antennas for 80 meters and higher are not extremely high Q, it would be difficult to do a similar experiment to determine what the actual tuning bin widths are on the higher frequency ranges. I realize this behavior may be of academic interest only, since the firmware does seem to do a good job of selecting the appropriate tuning solution, but for a very high Q antenna such as is frequently found on 160 and/or highly compromised shortened antennas for other HF bands it could be important. It would be nice if the Elecraft folks would correct the manual to show what the actual tuning bin widths are for each range. 73... Randy, W8FN On 11/29/2018 8:48 PM, Don Wilhelm wrote: Randy, That indicates that you do not have your KAT500 and amplifier properly connected. The KEYOUT line from the transceiver should go first to the KAT500, and then from the KAT500 to the amplifier. When the KAT500 needs to tune, the amplifier will not be keyed and tuning will take place at the power output of the transceiver. After tuning, the amplifier will be engaged. 73, Don W3FPR __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
[Elecraft] Connecting KPA1500 tp Icom Pro3
I would like to connect my KPA-1500 to my backup radio. An Icom Pro 3 while my K3S is vacationing in Watsonville. I have repeatedly asked Support at Elecraft and have never received an answer. Can anyone tell me what cabling is available To connect to the CI-V on the Icom I see a cable on the Elecraft website #CBL-ICOMKEY. I believe it’s priced at $49 which would seem a bit high for a simple RCA to RCA. But I can not get anyone at Elecraft to clarify if that is or is not the proper cable. All I’m looking for is basically auto band switching. My vision isn’t very good anymore so putting one together would not be my first choice. Any help or in-site would be appreciated Ron Genovesi N3ETA Sent from My iPad __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] P3 Phantom Signals
You do know that you can notch spurious signals out of your receiver? There are instructions for doing so in the operating manual. It's kind of interesting to see how it appears on the P3, though. The spurious will tune across in reverse directions from normal signals, and usually at double speed. If you've notched it out of your receiver (the procedure jiggles the synthesizer frequencies a bit in the immediate area of your receiver passband) you will see it approach your receiver passband on the display and then magically disappear as it crosses your passband cursor. It will then re-appear on the other side. Pretty interesting effect, but perfectly logical, once you understand what is being done 'under the covers' to prevent you hearing that birdie in your receiver. 73, -- Dave, N8SBE Original Message Subject: Re: [Elecraft] P3 Phantom Signals From: Keith Onishi Date: Thu, November 29, 2018 11:43 pm To: Elecraft I have the same on my P3. I guess the phantom signals come from synthesizer spurious. When K3 VFO tunes to the phantom signal by turning VFO nob, you will hear its carrier. My K3 is not K3s but old one with original synthesizer. I am not sure on K3s or K3 with new synthesizer. 73 de JH3SIF, Keith > 2018/11/28 9:05、Ken Widelitz のメール: > > I've noticed a large number of "phantom" signals on the P3. They look like > signals but when I turn the RX dial, they move along with the cursor. When I > turned the P3 off and then on, they went away of 40m but that same thing > didn't happen on 15m. Any ideas? > > > > 73, Ken, K6LA / VY2TT > > > > > > __ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:Elecraft@mailman.qth.net > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > Message delivered to jh3...@sumaq.jp __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to n8...@arrl.net __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] [K3] SWR - Numerical Indication
This discussion reminds me of a lesson in engineering class (55 years ago) about the difference between precision and accuracy. The professor used the example of bullet holes in a target. If the holes were closely spaced, but far from the bulls-eye, the shooter was inaccurate but precise. If the holes were widely spaced, but the average was near the bulls-eye the shooter was accurate but imprecise. Closely spaced on the bulls-eye precise and accurate Widely spaced, and the average not near the bulls-eye, imprecise and inaccurate. Easy to remember. Some other memorable nuggets from that class: Evaporation is a cooling process. High octane gasoline is slow-burning gasoline. The electric company bills you for kilowatt-hours, so they are not a power company, they are an energy company. Dave Hachadorian, K6LL Yuma, AZ -Original Message- From: Don Wilhelm Sent: Friday, November 30, 2018 7:55 AM To: elecraft@mailman.qth.net Subject: Re: [Elecraft] [K3] SWR - Numerical Indication Petr and all, Those digital instruments that show 2, 3, or 4 decimal places have given us a false sense of accuracy. For instance an instrument that is accurate to 5% and has a 4 digit display can show us (when measuring a 5 volt source) anywhere between 4.750 volts and 5.250 volts and still be within the 5% accuracy window for the instrument. Review the specs and calibration for whatever meter you are using and do not expect those extra digits to be correct - in other words round the numbers displayed. Many wattmeters are only accurate to 20% of the reading - so if one wattmeter at 100 watts shows 120 watts and another shows 80 watts, the actual power could be 100 watts. Take that into consideration. The Telepost LP-100 when calibrated to NIST standards is accurate to 5% (it can be lower, but Larry will not guarantee it). So any power it displays between 95 and 105 watts can actually be 100 watts. In other words, look at the specified accuracy of whatever meter you are using and take that into consideration. Those extra digits on your meter may be meaningless. 73, Don W3FPR On 11/30/2018 9:29 AM, Petr, OK1RP/M0SIS wrote: Hi Wes, excellent! Many thanks for this post which is nicely explaining what is going on about the measurement in K3s. In fact until now no one talked about the calibrations, uncertainties, errors, accuracy, reading errors, uncertainties A, B and combined uncertainties etc. In that case there is several error sources and factors which need to be calculated in order to get some more precise values ...and in all cases the uncertainties must be calculated together with measured value if we would like to talk about scientific or sophisticated measurement. Thanks for nice explanation Wes to all. __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to k6ll.d...@gmail.com __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] SWR - Numerical Indication
On 11/30/2018 9:54 AM, ANDY DURBIN wrote: > Few instruments suddenly change their properties on the day the calibration > certificate expires. Yeah but...an expired certificate can be a very important part of the shouting and stamping should the issue wind up in a dispute between "experts" in litigation for some reason. (I have two hats - one says "Professional Engineer" and the other says "Attorney-at-Law".) 73 de K2ASP - Phil Kane Elecraft K2/100 s/n 5402 >From a Clearing in the Silicon Forest Beaverton (Washington County) Oregon __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] SWR - Numerical Indication
What happened to using a Simpson 260 or 270 or Triplet 603? Those are actually better for finding a peak or null, which in both cases are only relative. If one works on HV amps as I do from time to time, you'll find the life of a DVM to be zap. 73 Bob, K4TAX On 11/30/2018 11:54 AM, ANDY DURBIN wrote: "Those extra digits on your meter may be meaningless." They may be meaningless or they could be very useful. Finding a peak or null, or looking for any small amplitude change, does not require absolute accuracy but high resolution can be useful. "A freebie Harbor Freight digital voltmeter appears to have a helluva lot better accuracy than reality." What is important is knowing what you want to measure and how useful your instrument is for making that measurement. For example I have an LP 100A , spectrum analyzer, and a digital storage scope but the multimeter I usually use is a freebie from Harbor Freight. I have quite a few of these and measurements are remarkably consistent between meters. The only one I found to be bad had a very interesting anomaly. The display acted as a photo cell and skewed the readings if used in direct sunlight! Indoors it was as good (or bad) as all the others. A mistake many seem to make is to assume that something that is calibrated is therefore accurate. Typically a calibrated instrument is only as good as the manufacturer's specification. A 20% instrument is still a 20% instrument even if it has a current calibration certificate. What calibration does is weed out the instruments that no longer meet the manufacture's specification and brings them back to that specification level. It used to wind me up that at work I was required to use a DVM with a current calibration certificate to check whether a signal was in asserted or non asserted state. Any instruments that were not in calibration were routinely rounded up by the metrology lab police. Few instruments suddenly change their properties on the day the calibration certificate expires. Andy k3wyc __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to rmcg...@blomand.net __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] [K3] SWR - Numerical Indication
On 11/30/2018 8:12 AM, Charlie T wrote: > it was better when we only had slide-rules to calculate things. And we had to have "situational awareness" of the order of magnitude of the result. "What is the relationship between a megaphone and a microphone?" Answer - 10^12 Back on topic - what is the "advertised accuracy" of the KAT100 SWR bridge? 73 de K2ASP - Phil Kane Elecraft K2/100 s/n 5402 >From a Clearing in the Silicon Forest Beaverton (Washington County) Oregon __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
[Elecraft] SWR - Numerical Indication
"Those extra digits on your meter may be meaningless." They may be meaningless or they could be very useful. Finding a peak or null, or looking for any small amplitude change, does not require absolute accuracy but high resolution can be useful. "A freebie Harbor Freight digital voltmeter appears to have a helluva lot better accuracy than reality." What is important is knowing what you want to measure and how useful your instrument is for making that measurement. For example I have an LP 100A , spectrum analyzer, and a digital storage scope but the multimeter I usually use is a freebie from Harbor Freight. I have quite a few of these and measurements are remarkably consistent between meters. The only one I found to be bad had a very interesting anomaly. The display acted as a photo cell and skewed the readings if used in direct sunlight! Indoors it was as good (or bad) as all the others. A mistake many seem to make is to assume that something that is calibrated is therefore accurate. Typically a calibrated instrument is only as good as the manufacturer's specification. A 20% instrument is still a 20% instrument even if it has a current calibration certificate. What calibration does is weed out the instruments that no longer meet the manufacture's specification and brings them back to that specification level. It used to wind me up that at work I was required to use a DVM with a current calibration certificate to check whether a signal was in asserted or non asserted state. Any instruments that were not in calibration were routinely rounded up by the metrology lab police. Few instruments suddenly change their properties on the day the calibration certificate expires. Andy k3wyc __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] KPA500 Fan Control
John et al: With my KPA500 and SSB rag chews I keep the fan on NORMAL. It does cycle on and up from time to time. When operating digital modes at 400 to 500 watts, I set the fan to 1. It still does move to higher speeds during transmissions as the TEMP gets to 60 degrees or so. Then drops back to level 1. As to operating at 2, other than the amount of added noise and a bit of wear, I see little disadvantage or advantage for that matter. At the same time, I agree that heat is the most damaging component to solid state devices. By the way, as my amp fan is about 4" from the wall behind it, adding some acoustic material on the wall behind the amp I find soaks up some of the noise. 73 Bob, K4TAX On 11/30/2018 9:30 AM, Monkeys wrote: Is there any harm in setting the fan at level 2 and just leaving it there? I would think the fan might wear out a little faster, but how much faster? The reason I ask is that when the fan control is set to NOR I find that the fan eventually...and understandably... kicks into a super high speed whine on extended CW ragchews. But I have found by setting the fan control to 2, the amp seems to like this 'pro-active' cooling. I can ragchew to my heart's content and it never goes into that high speed jet-taking-off or vacuum cleaner level. Has anyone else changed their fan from NOR to 2 as a default and experienced any side effects? John K7FD __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to rmcg...@blomand.net __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] [K3] SWR - Numerical Indication
All, There is a big difference between accuracy and precision. Precision can be accomplished by adding the extra digits, but the accuracy of the instrument will tell you how many of those extra digits are to be considered. Most digital voltmeters, even the cheap or free ones from Harbor Freight and others are surprisingly accurate (5% or so is common), but typical voltage readings of 3 significant digits are reasonable but any digits more than that are extraneous unless the instrument is of lab quality. 73, Don W3FPR On 11/30/2018 11:12 AM, Charlie T wrote: Yep, ur right Don. A freebie Harbor Freight digital voltmeter appears to have a helluva lot better accuracy than reality. Digital calculators on the other hand, ARE accurate. This changes our mind-set, simply because we see all those digits past the decimal point on a dVOM. it was better when we only had slide-rules to calculate things. Accuracy to more than three places was at best, a guess. Besides, what good does it do to arrive at a required by-pass capacitor's value of 0.0110987 µF ? 73, Charlie k3ICH -Original Message- From: elecraft-boun...@mailman.qth.net On Behalf Of Don Wilhelm Sent: Friday, November 30, 2018 9:56 AM To: elecraft@mailman.qth.net Subject: Re: [Elecraft] [K3] SWR - Numerical Indication Petr and all, Those digital instruments that show 2, 3, or 4 decimal places have given us a false sense of accuracy. For instance an instrument that is accurate to 5% and has a 4 digit display can show us (when measuring a 5 volt source) anywhere between 4.750 volts and 5.250 volts and still be within the 5% accuracy window for the instrument. Review the specs and calibration for whatever meter you are using and do not expect those extra digits to be correct - in other words round the numbers displayed. Many wattmeters are only accurate to 20% of the reading - so if one wattmeter at 100 watts shows 120 watts and another shows 80 watts, the actual power could be 100 watts. Take that into consideration. The Telepost LP-100 when calibrated to NIST standards is accurate to 5% (it can be lower, but Larry will not guarantee it). So any power it displays between 95 and 105 watts can actually be 100 watts. In other words, look at the specified accuracy of whatever meter you are using and take that into consideration. Those extra digits on your meter may be meaningless. 73, Don W3FPR __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to donw...@embarqmail.com __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
[Elecraft] KPA500 Fan Control
I do the same thing for the same reason when operating FT8 (40 watts out) but at fan speed 1 - the temp then never goes even close to where it would normally turn on (50C). In fact, I wish there was a speed half of what 1 is for lower noise and probably the same effect. John AE5X https://ae5x.blogspot.com *> But I have found by *>* setting the fan control to 2, the amp seems to like this 'pro-active' *>* cooling. I can ragchew to my heart's content and it never goes into* __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] [K3] SWR - Numerical Indication
Yep, ur right Don. A freebie Harbor Freight digital voltmeter appears to have a helluva lot better accuracy than reality. Digital calculators on the other hand, ARE accurate. This changes our mind-set, simply because we see all those digits past the decimal point on a dVOM. it was better when we only had slide-rules to calculate things. Accuracy to more than three places was at best, a guess. Besides, what good does it do to arrive at a required by-pass capacitor's value of 0.0110987 µF ? 73, Charlie k3ICH -Original Message- From: elecraft-boun...@mailman.qth.net On Behalf Of Don Wilhelm Sent: Friday, November 30, 2018 9:56 AM To: elecraft@mailman.qth.net Subject: Re: [Elecraft] [K3] SWR - Numerical Indication Petr and all, Those digital instruments that show 2, 3, or 4 decimal places have given us a false sense of accuracy. For instance an instrument that is accurate to 5% and has a 4 digit display can show us (when measuring a 5 volt source) anywhere between 4.750 volts and 5.250 volts and still be within the 5% accuracy window for the instrument. Review the specs and calibration for whatever meter you are using and do not expect those extra digits to be correct - in other words round the numbers displayed. Many wattmeters are only accurate to 20% of the reading - so if one wattmeter at 100 watts shows 120 watts and another shows 80 watts, the actual power could be 100 watts. Take that into consideration. The Telepost LP-100 when calibrated to NIST standards is accurate to 5% (it can be lower, but Larry will not guarantee it). So any power it displays between 95 and 105 watts can actually be 100 watts. In other words, look at the specified accuracy of whatever meter you are using and take that into consideration. Those extra digits on your meter may be meaningless. 73, Don W3FPR __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] [K3] SWR - Numerical Indication
So soryy, my fault... 73 - Petr, OK1RP > Sent from my iPad > > > On Nov 30, 2018, at 6:29 AM, Petr, OK1RP/M0SIS wrote: > > > > Hi Wes, > > > > excellent! > > > > Many thanks for this post which is nicely explaining what is going on about > > the measurement in K3s. > > > > In fact until now no one talked about the calibrations, uncertainties, > > errors, accuracy, reading errors, uncertainties A, B and combined > > uncertainties etc. In that case there is several error sources and factors > > which need to be calculated in order to get some more precise values ...and > > in all cases the uncertainties must be calculated together with measured > > value if we would like to talk about scientific or sophisticated > > measurement. > > > > Thanks for nice explanation Wes to all. > > > > Best regards. In reply to this post by Bob McGraw - K4TAX I would be surprised if two garden variety instruments, even placed at the same point, would agree. The directional bridges/couplers in most "(V)SWR" meters that hams routinely use externally or which are built into our radios are not precision instruments. There are a number of error sources in reflection measurements; source match, diode non-linearity, coupler tracking errors and often the most significant, directivity error. In an ideal coupler, (i.e signal separation device) one port measures the forward (incident signal) and another measures the reverse (reflected) signal and there is no coupling between ports in the unwanted direction(s). In other words there is no signal at the reverse port due to the forward signal. In a real world coupler there is some leakage signal appearing at the reverse port due to the forward signal, absent any reflected signal. The "goodness" of a directional coupler in this instance is called "directivity" and the error signal is directivity error. Directivity is usually specified in dB. Really good couplers might have directivities in the 40 dB neighborhood. Really really good directional bridges can be 50 dB, but so-so units might be 25-30 dB. Not ready for prime time units are lower than this. Now I have no way of knowing what the directivities are of the couplers built into K3s, KPA500s, KAT500s, etc. but considering that they have to work over about 5 octaves, I'm going out on a limb and saying that 25 to 30 dB is a fair estimate. If I'm wrong, I'm sure I'll hear about it. For sake of discussion I'm going to use 26.5 dB. What this means is that if I terminate the output spigot of one of these radios with a perfect 50+j0 load, I'm going to measure a leakage signal (directivity error) that is 26.5 dB below the incident value. I'll introduce the concept of return loss here. We hams usually speak in terms of SWR. SWR = (1 + p) / (1 - p) where p is the reflection coefficient. Here the p = the voltage measured at the reflected port and the constant 1 represents the incident signal. In reality both of these quantities are complex numbers, they have both magnitude and phase but SWR measurements are scalar, we throw away the phase (since it's difficult to measure) and just use the magnitude. (In fact the symbol "p", which is really the Greek letter rho, indicates the magnitude of the reflection coefficient in normal usage) We can also express this ratio as return loss, which is -20 * log10(p). So return loss, SWR and reflection coefficient are just different ways to express the same thing; the ratio of incident to reflected signal. Let's return to our example; the coupler with 26.5 dB directivity, which indicates a return loss (RL) of 26.5 dB even with a perfect termination. Doing the math and converting RL = 26.5 dB to SWR we get 1.1:1. Our perfect load measures 1.1:1 with our imperfect instrument. And this assumes that there are no other errors, which there always are. But it gets worse. Let's say that the load we want to measure really is 1.1:1. We now have two (apparent) reflections, 1) the real one and 2) the directivity error and they both have the same magnitude. In our simple detector, they sum together. Now I said earlier that we don't measure phase, only magnitude, but just because we don't, or can't measure the relative phases doesn't mean they aren't there. We will examine two cases to determine the limits of error. Case 1) both reflections are in phase, they add up to p + p or 2p, RL = 20.5 and SWR ~1.21:1. Case 2) they are exactly out of phase, they sum to zero. p = 0, RL is infinite and SWR = 1:1. The possible RL error is then -6 to +infinity dB! In other words, an actual SWR of 1.1:1 can be measured anywhere between 1.0:1 and 1.2:1. Is it any wonder that we often read about concerns that one device measures one thing, while another located at the same, or close location measures something different. Of course all of this is predicated on a directional coupler with 26.5 dB directivity and no other error sources. It's
Re: [Elecraft] KPA500 Fan Control
John, It is good to hear that you have had success with a fan setting of 2. Like most mechanical components, there is a wearout time, but I suspect it is in the vicinity of 1000 to 5000 hours. That is a lot of operating time. If you are concerned about wearout, just turn the KPA off (or standby) when not using it. 73, Don W3FPR On 11/30/2018 10:30 AM, Monkeys wrote: Is there any harm in setting the fan at level 2 and just leaving it there? I would think the fan might wear out a little faster, but how much faster? The reason I ask is that when the fan control is set to NOR I find that the fan eventually...and understandably... kicks into a super high speed whine on extended CW ragchews. But I have found by setting the fan control to 2, the amp seems to like this 'pro-active' cooling. I can ragchew to my heart's content and it never goes into that high speed jet-taking-off or vacuum cleaner level. Has anyone else changed their fan from NOR to 2 as a default and experienced any side effects? __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] [K3] SWR - Numerical Indication
I wish I could find the original post that started this discussion. Very frustrating when there is no quoted material. Sent from my iPad > On Nov 30, 2018, at 6:29 AM, Petr, OK1RP/M0SIS wrote: > > Hi Wes, > > excellent! > > Many thanks for this post which is nicely explaining what is going on about > the measurement in K3s. > > In fact until now no one talked about the calibrations, uncertainties, > errors, accuracy, reading errors, uncertainties A, B and combined > uncertainties etc. In that case there is several error sources and factors > which need to be calculated in order to get some more precise values ...and > in all cases the uncertainties must be calculated together with measured > value if we would like to talk about scientific or sophisticated > measurement. > > Thanks for nice explanation Wes to all. > > Best regards. > > > > - > 73 - Petr, OK1RP > "Apple & Elecraft freak" > B:http://ok1rp.blogspot.com > G+:http://goo.gl/w3u2s9 > G+: http://goo.gl/gP99xq > -- > Sent from: http://elecraft.365791.n2.nabble.com/ > __ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:Elecraft@mailman.qth.net > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > Message delivered to w...@w2xj.net > __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
[Elecraft] KPA500 Fan Control
Is there any harm in setting the fan at level 2 and just leaving it there? I would think the fan might wear out a little faster, but how much faster? The reason I ask is that when the fan control is set to NOR I find that the fan eventually...and understandably... kicks into a super high speed whine on extended CW ragchews. But I have found by setting the fan control to 2, the amp seems to like this 'pro-active' cooling. I can ragchew to my heart's content and it never goes into that high speed jet-taking-off or vacuum cleaner level. Has anyone else changed their fan from NOR to 2 as a default and experienced any side effects? John K7FD __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
[Elecraft] External AMP
I am using my ancient Heathkit SB 230 (original tube) with my K3s. Is there a way to get 12 volts out of acc connector to power relay? Using K3 external plug for P3 power. Ray W8LYJ Sent from my iPhone __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] [K3] SWR - Numerical Indication
Petr and all, Those digital instruments that show 2, 3, or 4 decimal places have given us a false sense of accuracy. For instance an instrument that is accurate to 5% and has a 4 digit display can show us (when measuring a 5 volt source) anywhere between 4.750 volts and 5.250 volts and still be within the 5% accuracy window for the instrument. Review the specs and calibration for whatever meter you are using and do not expect those extra digits to be correct - in other words round the numbers displayed. Many wattmeters are only accurate to 20% of the reading - so if one wattmeter at 100 watts shows 120 watts and another shows 80 watts, the actual power could be 100 watts. Take that into consideration. The Telepost LP-100 when calibrated to NIST standards is accurate to 5% (it can be lower, but Larry will not guarantee it). So any power it displays between 95 and 105 watts can actually be 100 watts. In other words, look at the specified accuracy of whatever meter you are using and take that into consideration. Those extra digits on your meter may be meaningless. 73, Don W3FPR On 11/30/2018 9:29 AM, Petr, OK1RP/M0SIS wrote: Hi Wes, excellent! Many thanks for this post which is nicely explaining what is going on about the measurement in K3s. In fact until now no one talked about the calibrations, uncertainties, errors, accuracy, reading errors, uncertainties A, B and combined uncertainties etc. In that case there is several error sources and factors which need to be calculated in order to get some more precise values ...and in all cases the uncertainties must be calculated together with measured value if we would like to talk about scientific or sophisticated measurement. Thanks for nice explanation Wes to all. __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] [K3] SWR - Numerical Indication
Hi Wes, excellent! Many thanks for this post which is nicely explaining what is going on about the measurement in K3s. In fact until now no one talked about the calibrations, uncertainties, errors, accuracy, reading errors, uncertainties A, B and combined uncertainties etc. In that case there is several error sources and factors which need to be calculated in order to get some more precise values ...and in all cases the uncertainties must be calculated together with measured value if we would like to talk about scientific or sophisticated measurement. Thanks for nice explanation Wes to all. Best regards. - 73 - Petr, OK1RP "Apple & Elecraft freak" B:http://ok1rp.blogspot.com G+:http://goo.gl/w3u2s9 G+: http://goo.gl/gP99xq -- Sent from: http://elecraft.365791.n2.nabble.com/ __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] FT8 Upgrade
Must be “new” time. My clock only has one hour between 0200 and 0300 Z. Sent from my iPhone ...nr4c. bill > On Nov 29, 2018, at 4:38 PM, Bob N3MNT wrote: > > > > To test this latest, greatest and most updatest version (guaranteed not to > rust, bust or collect dust), a mock two-hour test/contest will take place > this weekend. Specifically, from 0200-0300Z on 1 Dec, which is Friday > evening here in Los Estados Unido > > > > -- > Sent from: http://elecraft.365791.n2.nabble.com/ > __ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:Elecraft@mailman.qth.net > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > Message delivered to n...@widomaker.com __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
