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I was using magnet wire to wind the transformers but have rewound them this afternoon using insulated wire. They now look like the transformer shown in the W8JI link you sent. They are wound 1 to 8

On Wed, Mar 18, 2020 at 10:33 AM, TT7 wrote: Sadly, they are not shipping to the Czech Republic yet. =================================================== Tomas, Probably just as well. There have not

Sadly, they are not shipping to the Czech Republic yet. In an email response, the seller said they were looking into adding other shipping methods, but no time frame was given. Tomas

It is my understanding that after you do a Clearconfig 1234 you must turn off the power and after turning the power on do a touch calibration and then a calibration with a save to Channel 0. Maybe Heb

First 1 turn is always though both hole there is no .5 turn. Also if the inductance of the winding is not high enough you get a low frequency cutoff. Changing the ferrite to higher mu (43 to 73) will

https://www.tindie.com/products/hcxqsgroup/nanovna-v2/

Hello, If one uses *nanovnasaver*, what do you think it will be the best firmware? I am fortunate to have a small PC at my desk to use with the VNA. *73 de Luís, CT2FZI* http://www.ct2fzi.net

clearconfig 1234 did not seem to help To calibrate I: Connect open to CH0, OPEN Connect short to CH0, SHORT Connect 50 ohms load to CH0, LOAD Remove 50 ohms load from CH0 and connect to CH1, ISOLN

In fact this issue is not a big deal to fix it by adding washer. However, it would be frustrated when happens. I did encounter the issue with my 2.8 inch H version so that I simply go back without the

Kerr, I don't how you are winding or measuring these transformers but something is definitely not right. The coefficient of coupling K is very close to 1 with binocular cores and the core losses are

I have never heard of anyone counting a pass through one hole of a binocular core as a full turn. Fair-rite states: "The 61 and 67 material multi-hole beads are tested for AL value. The test frequency

So, the good match is likely mostly due to loss. Of course, since you have two transformers in the measurement, the loss through one is half the S21 values. Still, most of the good match is due to

Below are S11 plots of R + jX and |Z|, these look quite similar to yours I think - the Y-axis scales on mine are zoomed in a bit (I did try to set them from 75 to -75 on the Y-axis to match your scale

I have just removed the 50 ohm resistor off the second transformer and attached CH1 of the NanoVNA instead. The attached image is the S21 plot of the sweep from 1 to 30MHz. At 7.15MHz the gain shows

So, the match is good over HF. Thinking after I hit send: Why not connect the secondaries together as you did for the S11 measurement and do an S21 measurement to assess loss? That way, both ports are

Looks pretty darn good to me. However, I must pose the question: how much of that good-looking SWR and centered on the Smith Chart is due to loss? Dave - W?LEV -- *Dave - W?LEV* *Just Let Darwin

On a NanoVNA-H, a linear polarizer, like most polarized sunglasses, has relatively little affect on intensity, regardless of the orientation. But in conjunction with pair of "3D" glasses, crossed with

Kerr, Here are some tests I did with 1 full turn on primary with 5 full turns on secondary. Primary wire comes out one side and secondary out the other. Ratio of 5 turns gives impedance transformation

I have removed the two transformers from my test circuit and attached the NanoVNA to the primary of the first one, the two transformers secondaries (8 turns) are connected together and a 50 ohm

Physically, yes. Circuit-wise and considering magnetics, its is a full turn. Dave - W?LEV wrote: -- *Dave - W?LEV* *Just Let Darwin Work* *Just Think*