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A dead receiver on CH0 would show good load, and bad open/short, because in the load case, there's no reflected power.

One thing to try before concluding that a unit is bad would be to reflash the firmware, in case something has gotten corrupted and to be sure you are running current code; this is important in these

200 Georges for that Keysight SMA torque wrench ICYAI more than the VNA

Odds are good that you either have a problem with the s11 SMA connector on the second #2 NanoVNA, or that your open and short calibration hats are dirty or somewhat defective. Try at a few different

The reflection coefficient is the voltage "reflected" back from the unit under test (it's voltage, not power, but it's similar to Ref/Fwd on a directional watt meter) - shorts and opens are "perfect

Sorry Jim, I forgot to Thank You for your suggestion.? I never thought to verify the OSL on the Smith Chart like I did the first time I went through the Calibration procedure with the first NanoVNA-H

Ok, "reflection coefficient" on the Smith Chart?? Bingo!! VNA #2 on the Smith Chart I see a 50 ohm load on Open, Short and of course Load.? Calibrated or not. It's Broke? George

I'm sorry, I don't understand "reflection coefficient". I did now Reset Calibration and looked at the LogMag results if that what you were asking: #1 VNA O= -3db? S- -1db? L= -40db #2 VNA O= -86db?

what readings do you get for all three terminations *without calibration*? - the NanoVNA isn't perfect, but you should get close to 1, 0, and -1 for the reflection coefficient. And between two units,

Yup, I agree... "Something's wrong here, this looks like you're measuring your load." Nope... "Something's wrong here, did you measure your load by accident? " "I'd go back and check the load and

So your saying that on the Open test one VNA saying LogMag= 0.01db and the other VNA is LogMag= -86.5db, and on the Short test one VNA having LogMag= 0.00db and the other -80.0db, "VNA readings are

On 3/2/22 5:03 PM, WD0AKZ via groups.io wrote: > I have been using antenna tuning devices for a number of years now. Starting out with VSWR meters, Bird Thru-Line meters, TDR’s, MFJ-259B, and a

On 3/2/22 7:07 PM, montanaaardvark wrote: > On Wed, Mar 2, 2022 at 08:13 PM, WD0AKZ wrote: > >> #1 VNA w/Load Calibration Load: SWR= 1.001 LogMag= -66.3db X= 5mOhm Z= 50.045 >> #2 VNA w/Load

Thanks for the comments Bob... Yes, I did use the exact same cals on both NanoVNA's and your are also correct that I did not take lab procedures in doing the tests. The final SWR's in the 50 ohm Load

Bob is entirely correct. All VNA's use directional couplers, with the 'uncertainty' around the directivity often confusing measurements. The perfect analog is measuring say a 9v battery with two

The way I read this you used the exact same cal standards on both NanoVNAs, right? Standard practice for calibration in the labs I've worked in was to clean both connectors with denatured alcohol and

I have been using antenna tuning devices for a number of years now. Starting out with VSWR meters, Bird Thru-Line meters, TDR’s, MFJ-259B, and a RigExpert AA-230Zoom which I sold last year. I came

I had that same thing happen to me... Where windows insisted it had the "best" driver. The problem was it had installed A driver, but actually had the device listed under the wrong category in device

If you're using the original USB cable that came with the Nano - try another one. A number of Nano users have had issues with those original cables. Also, refer to a message thread from a few days ago

Update: Can't get NanoVNA to show up as anything but "Unknown USB Device (Device Descriptor Request Failed" in windows device manager. I have the STM32 drivers installed, and forcing windows to