Re: [Elecraft] [K3] SWR - Numerical Indication

"Do you find a high degree of correlation between your (assumed) K3 and KAT500 SWR readings across various levels of SWR? " I don't have a K3. I do have loads of recorded data that would allow comparison of KPA500 SWR and LP-100A SWR and a more limited set of data that would allow

Re: [Elecraft] [K3] SWR - Numerical Indication

Hi Dick, The Elecraft list does not accept attachments. Send to me directly. John KN5L On 12/2/18 4:14 PM, Dick Dickinson wrote: > Hi John, > > Per your suggestion, I ran a sweep of my 40 meter vertical with the K3 / > K3EZ software. > > I then measured at ~20 kHz steps with my MFJ-259B. >

[Elecraft] [K3] SWR - Numerical Indication

Hi Andy, Thanks for sharing your thoughts. Do you find a high degree of correlation between your (assumed) K3 and KAT500 SWR readings across various levels of SWR? Kindly, Dick - KA5KKT ANDY DURBIN

Re: [Elecraft] [K3] SWR - Numerical Indication

Hi John, Per your suggestion, I ran a sweep of my 40 meter vertical with the K3 / K3EZ software. I then measured at ~20 kHz steps with my MFJ-259B. Both sets of measurements were taken from the PL-259 that plugs into the rig or 259B. Conditions were ~60 degrees F, ground nearly

[Elecraft] [K3] SWR - Numerical Indication

"Is this 1.0:1 SWR across the entire 40 meter band curious or remarkable?" I'd guess that it's improbable and likely the result of measurement error. The reflected voltage will be zero for low or high power if the antenna system is a perfect match . However, the (measured) reflected voltage

Re: [Elecraft] [K3] SWR - Numerical Indication

What is VSWR? There are many misconceptions and myths about VSWR. To try to overcome some of these misconceptions and to try to provide an easy and understandable summary, Electronics Notes has developed a page describing what VSWR is and this is accompanied by an embedded video. The page and

Re: [Elecraft] [K3] SWR - Numerical Indication

Hi Dick, An EZNEC and SimSmith model of the on ground 1/4 wave vertical: https://www.kn5l.net/images/SS-KA5KKT-vertical.png SimSmith R1 represents ground loss, the value set to establish a 50 ohm load at the transmitter, G in SimSmith. According to the models, the 7 to 7.3 MHz SWR is a little

Re: [Elecraft] [K3] SWR - Numerical Indication

Hi Dick, An EZNEC and SimSmith model of the on ground 1/4 wave vertical: https://www.kn5l.net/images/SS-KA5KKT-vertical.png SimSmith R1 represents ground loss, the value set to establish a 50 ohm load at the transmitter, G in SimSmith. According to the models, the 7 to 7.3 MHz SWR is a little

Re: [Elecraft] [K3] SWR - Numerical Indication

Thanks for the explanation, John. I’m not an electronically educated fellow, merely just seeking the practical. A resolution to my post was provided in the suggestion that the apparent 1.1:1 SWR might be the result of common mode current. Sure enough when I installed a 1:1 current

Re: [Elecraft] [K3] SWR - Numerical Indication

Hi Dick, Some numbers: using the K3 Schematic, "K3S RF Board" Sheet 2, Section B1. The power meter uses a series Schottky diode detector. The low reasonable resolution is about 0.3 VDC, or 0.3 * .707 = 0.21 Vrms out of the directional coupler. The Power for 0.21 Vrms is: 0.21^2 / 50 = .88 mW

Re: [Elecraft] [K3] SWR - Numerical Indication

: 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

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

Re: [Elecraft] [K3] SWR - Numerical Indication

: 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

Re: [Elecraft] [K3] SWR - Numerical Indication

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

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

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

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

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

Re: [Elecraft] [K3] SWR - Numerical Indication

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

Re: [Elecraft] [K3] SWR - Numerical Indication

From: Bob McGraw K4TAX To: elecraft@mailman.qth.net Sent: Friday, July 27, 2018 1:10 PM Subject: Re: [Elecraft] [K3] SWR - Numerical Indication Yes, the K3S SWR display can show a 1.0:1 value.  But in my case,  it does not exactly agree with another instrument in the feed line

Re: [Elecraft] [K3] SWR - Numerical Indication

Yes, the K3S SWR display can show a 1.0:1 value.  But in my case,  it does not exactly agree with another instrument in the feed line system.     As to why you are showing two different values, as minute as they are I might add, you are measuring 2 different places in the feed line.   In my

Re: [Elecraft] [K3] SWR - Numerical Indication

Hi again, Oops I accidentally sent the message without the context quote. Get a good dummy load and you will get the indication "1.0 - 1". I have both the K3 (souped up to near K3S) and the K3S and they both do it. You are not confusing this with with 1.1, are you? AB2TC - Knut Dick

Re: [Elecraft] [K3] SWR - Numerical Indication

Hi, Get a good dummy load and you will get the indication "1.0 - 1". I have both the K3 (souped up to near K3S) and the K3S and they both do it. You are not confusing this with with 1.1, are you? AB2TC - Knut -- Sent from: http://elecraft.365791.n2.nabble.com/

[Elecraft] [K3] SWR - Numerical Indication

I've noticed that I'm not showing a reading of less than 1.1:1 SWR on my antennas per K3 SWR Numerical Readout. K3EZ will record 1.0:1 SWR in band sweeps. Can the K3(S) Numerical Display show 1.0:1 SWR? If so, is there a likely reason why K3EZ will show 1.0:1 while my K3 will only go as far