Neil, The HP3577A VNA with HP35676A test set covers from 5Hz to 200MHz. Only weighs about 70lb. Some versions of the NanoVNA-H4 firmware work down to 800Hz (I don't know how well). I don't know if the

If you are in the US, R and L Electronics (randl.com) has the 3GHz NanoVNA SAA2N at $110 and the 6GHz LiteVNA64 at $160. I have both, and have been very happy with R and L as a supplier. --John Gord

The "rock solid 50 ohms" is probably due to the 30dB attenuator. --John Gord

One practical use of the VNA phase measurement would be in adjusting the phase of the feeds to a multi-radiator antenna. A pair of stacked vertical dipoles can increase gain in the horizontal directio

Paul, Save Config doesn't save the trace setup. SAVE in the CALIBRATE menu does that (and saves the frequency range, too). --John Gord

Dave, If you are in the US, R&L Electronics ( randl.com ) has been a reliable source: https://www2.randl.com/index.php?main_page=product_info&cPath=15_8620&products_id=75242 --John Gord

Peter, The input impedance of a power amplifier may be very dependent on signal level. You would get more reliable results by driving the input of the PA at the correct signal level through a directio

I think the Ojisan firmware is intended for the NanoVNA V2, not the V2 plus4. --John Gord

Rasoul, The SAA-2 and SAA-2N can use the Ojisankoubou firmware. They work fine for crystal tests. Adjusting bandwidth and averaging settings is sometimes needed for high-Q filters. The Ojisankoubou fi

Better measurements of S11 at reduced signal levels can be made if you are willing to modify (at least temporarily) your NanoVNA. The drive to the S11 bridge can be reduced. This will reduce signal ou

Dean, I notice that at series resonance, the S21 value is slightly above unity (+0.04dB). This is non-physical, and may be confusing the crystal parameter calculations. You might want top put an atten

Leon, Did you go to the Stimulus menu and try setting a lower Start frequency? --John Gord

On most firmware versions, the averaging or bandwidth settings can be manipulated to give longer settling time at each frequency step. This helps for narrowband devices. --John Gord

Cesar, Are you sure you saved the full calibration? I only see C4, D at the left of the screen. On my NanoVNA-V2, I also see R and S after a calibration. I think these are for Reflection tracking and

Zack, Most test equipment specifies a warm-up time before meeting specs. The NanoVNA-V2 includes an internal self-check to compensate for temperature changes. (It measures an internal known impedance

I don't use NanoVNA-App, but if I recall correctly, the short and open standards can be defined with an offset (as opposed to "ideal" with no offset). How are they defined in your setup? If they are d

It looks like part of the problem may have to do with how you short the cable. Are you shorting it exactly the same in the calibration and for the plots you sent? (I assume the calibration is done wit

On professional VNAs like the 8753, the internal isolation of the hardware is so good that the isolation calibration step is only useful if you are using a fixture that has isolation problems. For the

tekguy, You should connect 50 ohm loads to both connectors. If you have an attenuator of 10 dB or more, that can be used as a reasonable 50 ohm load. --John Gord

John, Are you sure that your phase trace is looking at S21 phase and not S11 phase? --John Gord