开云体育

Wow, it's really amazing! 6GHz frequency range covers most amateur and non-amateur frequency bands. If this is a self-contained product, it will definitely be more popular！

Well, IMHO the fact that it is called a *LOSS *does automatically imply that it is a negative number... So, if you prefix it with a minus sign, you have two negations, i.e. a positive number.... Only

Amazing ! Now, I don't know if nanovnasaver author is here reading this group: wouldn't be interesting to have R X and Z of a "through" measure to be calculated automatically and eventually displayed

Federico, copy the first 5 columns from the .s2p file produced by nanovna-saver (these column should be FREQUENCY, S11 REAL, S11 IMAG, S21 REAL, S21 IMAG) and past them into the first 5 columns of the

P.S. in the meanwhile I upgraded device to v. 0.8.0 and restart from scratch... Federico ik3umt

Christian, my macroscopic mistake ;-( I was doing SOLI calibration with standard "N" references connected directly to VNA ports, and the only T calibration applying my fixture with clips connected !!

Looks like NanoVNA-Saver has to be extended to be able to show S12 and S22 graphs in near future. 73 Holger, DG5DBH

Hi Federico, you said above that you did the "through" calibration with the clips connected. It puzzles me, though, that the S21 readout is 1.4 dB. Regardless of how good your fixture or your

They were pretty much microwave mixer diodes, but thepreamp took advantage of their varactor characteristics. Will need to dig a bit, but I do have a few books on Paraamps I can send directly. Rebuilt

Bodged a HC06 bare module. It works :) Waiting for cho45 to add bluetooth serial support. [image: IMG_20200930_051138.jpg]

The Apollo program used amps like that for their Unified S-Band (USB, around 2.2GHz) receivers until switching to MASERs around 1967. I've been trying find out more about the technology of these amps

dB expresses a ratio between two numbers. Neither power nor voltage is implicit in the term. You have to explicitly state whether it is voltage, or power, or whatever. If you say dBm then it's the

Thanks for the link - worked perfectly! I just put the following together as I managed to get it all up and running on a Fire Tablet, rather than a standard Android tablet. Using NanoVNA with Amazon

No, that is an amplifier!!! You really see it when you have the input power (S11) reduced to -30 dB or so. High performance VHF/UHF GaAs FET preamps are usually pretty close toedge of their stability

That's not an amplifier, that's an oscillator.

You are correct, forgot that the equivalence does not hold when the real part is negative. Corrected and cleaned up version is attached. wrote:

Steve, You can add the serial port if you can solder two wirewrap wires to the uP pins. Refer to the most recent H schematic for the pins. They are 3v signals so you'll need a level shifter/interface

Larry, Thank you again for your quick response. Mine is not in a plastic case and is apparently a much older unit without the serial port on the board edge. I will look on the Wiki and find the

A good way to check trap resonance, if possible, is to open the lead of the capacitor or the inductor and connect the VNA and a 50 Ohm resistor across the open. At resonance the L and C cancel and you

Stephen, If you have an official H with the plastic housing and hardware version 3.4.2 you need to open the housing and look at the edge of the PCB. The serial port will be at the edge beside the