开云体育

Here is a good triband antenna that is cheap and easy to build. I've done several of these and several in the bunch here in N. Colorado. You can't beat it for simplicity and low cost. [image:

Practical example of 3 methods to measure impedance, for those that would like to avoid doing the math themselves: https://www.youtube.com/watch?v=1UbEz73FGCU

Here is the method we use to measure very low impedances in PDNs (power distribution networks). The figure and equation were extracted from the paper at the link below (authored by Istvan Novak and

I have a triband HT antenna that claims to be an ABBREE AR771. I ran a quick and dirty test with it mounted to the nanoVNA and held in my hand as one would hold a HT. All three bands were low at the

Hi Jack, I'm very familiar with Ed Fong's Tri-band antenna and I'm pretty sure that there is only one model which consists of a dual-band J-pole for 2m/440 and a helical wound, center-fed dipole for

Great news, I have to give this version a try!! I liked the Dislord big text version, I can’t remember why but I had to switch back to the standard firmware... maybe this one will work for me. --

Interesting, I have a Diamond X6000a tri bander, its a 2m/70cm/23cm designed for the Icom 9700. I have to throw that one on my nanny and see how she does! I use it of course with a triplexer designed

I have tested a few tri-band antennas using an HP VNA. The antennas were mounted in the middle of a large copper plane about 3-feet square. Typically, most are good on only two of the three claimed

Here is a quick check - put the 50 ohm load that you used for calibration and run the same scan as you did for the tri-band antenna. I have had several dual band and tri-band antennas over the years

No, on My firmware you can work from 800Hz (but not need calibrate from 800Hz to 1500MHz, this not good) Problem can be from old config settings

Thanks, I ran a calibration and saved to all 4 locations as you recommended and it is responding properly. Could it be I entered bad data by setting the start frequency at 10kHz instead of 50kHz? I an

For recall need only use RECALL->RECALL 0 or RECALL->RECALL 1 and e.t.c if device hang on recall - possibly problem in bad data on it, try reset config and clear settings (use console and run

I have a NanoVNA and an H4 model with the DiSlord 1/0/45 version, build Dec 15 2020. I am starting to lad configurations into the various recall groups. I have the same issue with both units. - Enter

The Low-Z measurements. The way to do that is using S21 measurement and short? CH0 to CH1. Then switch the low-Z impedance parallel to that. Ofcourse calbration is necessary for Z=infinite and Z=0,

I just loaded Hugen's mod of Dislord 1.0.45 and it looks nice on an H. 73 -Jim NU0H "Gyula Molnar" <gyula.ha3hz@...> wrote:

Arie, I would like to see your experiments with low impedances. Mike N2MS

Hi Roger and all, This one attracted my attention. Thanks for the nice graphs and foto's Roger. Love your test-jig. About 4months ago I wrote an article about measuring high impedances with the nano.

Hi w3wtw, Several solutions are possible. The easiest is to wear glasses. Last year, when development was in its infancy, there was firmware that used larger letters. Then during development, it was

Dear Gyula, thanks for the goal-oriented hint ... now everything works fine!! Best 73s de DL6RDE, Charlie -----Ursprüngliche Nachricht----- Von: [email protected] <[email protected]> Im

Hi Charlie, I think there is only a shortcoming in the use of the program. When you want to measure something and have already drawn the graph, you can make the measurement data visible with the