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I don't believe that the primary goal of a choke should be high L. Indeed if the system had a net C then the series L of the choke could make common mode worse where the L and C resonated. High

Kurt, I went there and downloaded the file but am told it's corrupted. Bob

The Nanovna runs off of a 3.7v li batt that drives an inverter circuit to supply the device with 5v. You can also run the unit through the usb port which provides 5v. Running from the battery means

I rest my recommendations on measuring many using the HP 8753C vector network analyzer. For current baluns, the high ? materials yield more L per turn and, consequently, offer more choking

I'll ask my question a different way. Without a battery, is it better to power the NanoVNA with 3.3 volts or 5 volts?

How else are you going to power the unit? -- *Dave - W?LEV* *Just Let Darwin Work* *Just Think*

Will plugging a NanoVNA without a battery into a USB port damage the unit?

Hi The nanoVNA partner does it semi automatic with a smart feature and a couple of mouse clicks Use nanoVNA Partner v0.20 link: https://gofile.io/?c=MZf5xz Kind regards Kurt -----Oprindelig

That's not really a very good suggestion.? As K9YC has s stated a zillion times on the TowerTalk reflector, type 31 material is pretty much the only really good material for a common mode choke at HF

Ah now I have found it, or eureka!? The trick is not to measure at the eighth wave (6 o'clock) point of the Smith chart; I was doing that and getting precisely 50 Ohms no matter what. The trick is to

Apparently what I supposed seems to be correct... copied from the PDF listing the console commands of the nanoVNA : =================== vbat_offset – allows the battery voltage shown on the GUI

I presume your are using coaxial cable? To make a choke (current) 'balun', I'd use a ferrite with high permeability (43, 75, 71, or 35 material). This configuration should consist of winding coaxial

OK. The filter is supposed to be a 118 to 500 MHz BPF. To properly characterize that filter, you must do a transmission plot, or S21. In this case, S21 should equal S12 as this is a bilateral network.

This is quite normal. Your 1.7 MHz HPF will likely still be reactive within the 160-meter band. I'd suggest connecting a 10 dB attenuator between the output of the filter and the input of the VNA to

Have you looked at your antenna impedance? Unless it is a terminated antenna such as a Beverage the feedpoint Z is going to vary all over the place, nowhere near 450 ohms. Ex: when it is 1/2

On Sun, Jan 26, 2020 at 01:29 PM, Oristo wrote: OK, since you ask, but I find yours much simpler to follow ================================================== Kind of you to say Oristo. The comments

It's is normal that they need your phone number. DHL and other couriers need your phone number on the package so that the driver who delivers it to you can contact you to work out delivery details.

SInce the NANO gives you both inductance and capacitance at the measurement frequency and we know the characteristic impedance is given by SQRT(L / C), we can calculate the impedance, Zo, directly: Zo

On Sun, Jan 26, 2020 at 01:34 PM, <sidebores@...> wrote: Hello Herb, The filter is connected to both ports? Can you tell me what I have not done please.

Hello Herb, The filter is connected to both ports? Can you tell me what I have not done please. Cheers Kev