开云体育

But the measurement system - that of the NANOVNA - is always in a 50-ohm system. To do it correctly, matching networks are required to match anything other than 50-ohms. Dave - W?LEV

Roger, The renormalization is useful for measuring networks (like crystal or ceramic filters) which are designed for other impedance levels. For example, it allows you to evaluate a 10.7MHz, 330ohm

There are quite a number of cheap and useful signal generators offered on epay. Dave - W?LEV

HI Philip tnx for the advice. I use a combo of SMA M/F attenuators to stay well under +10dBm max signal level for NanoVNA input. Wonder if you too use FY 6XXX generator. Gabriele, I4JXE

Hi Roger If the coding does not require a huge complication nor a large resources, it would be appreciated to have this option of the Z port2, it would also approach the enhanced response on H4

The 250m is a scaling parameter on the grid . So each successive horizontal line for SWR, in this case, increases by .25. 1.891 is the SWR calculated at the marker. Go into the Display/Scale menu to

DiSlord, I have tested your port renormalization function (called Port Z) for several values of Z like 75 and 100 ohms. It calculated S11 and S21 correctly for DUT's

Hi DiSlord and All I already used the standard load= 50.83 Ohm ( DC measur by a good Multimeter's) instead of 50.00 Ohm for the Nano calibration, and a Z0= 78.9 Ohm to optimise my nominal 75 Ohm coax

VNA calibrated by 50Om - nominal port impedance On measure S parameters possible calculate get Z parameters (by known Z0 = 50) Next possible calculate from this Z new S` parameters but use Z` != 50 Om

Yes, but I believe anyone (well........."maybe") can multiply any number by unity: 1. Or maybe not??????? Even with a normalized chart center, the measurement system is still as close to 50 ± j 0 as

Isn't that what the Z function does--allow normalisation of the chart to any resistance?

Why not just use a normalized Smith Chart? Ten the center resistance can be anything you want. Dave - W?LEV

Since I use the nanoVNA only for amateur radio or tinySA related work, everything is nominally 50 Ohms. But for purely theoretical reasons I'm looking forward to any expansion on this subject you care

NanoVNA has a port renormalization function (called Port Z, see DISPLAY->PORT Z: 50) that allows you to see the measured S parameters at other port impedances. But since NanoVNA is only available for

Question top left S11 SWR 250m/ 1.891 can you explain what these numbers are, and how did you get the 250m loaded into the nanovna. Newie still leaning to use my nano Thanks`

Hello Roger, OK, understand now. And I had checked that the scaling was the same in both tests. Not that I expected they would be different:-) Thanks for clarifying. Regards...Bob VK2ZRE

Hi Gabriele, Be careful with the level output of the FY6900 as it defaults to 5v. This is well above what is needed and can damage sensitive instruments such as a tinySA and nanoVNA port 2. Phil g3ses

No need, the VNA generates its own test signals internally. 73, Don N2VGU

Try hooking it to the input of a manual antenna tuner with a termination on the other port, display a Smith Chart, and manipulate the tuner controls, it is quite an eye-opener. Then remove the

Above HF/VHF anything with a "UHF" connector involved is going to exhibit increasingly poor performance. In addition nobody that I know of makes a good-quality UHF calibration kit so you will have to