Thanks, yes I've used that software, "NanoVNASaver", also and it's a powerful addition. Often when doing quick bench measurements I find it's easy and fast use the device itself, but I have the larger display model which can actually be read! With the small display I think I would use Saver a lot more. I also think it's important to know how to use the nVNA by itself because that's how it will be used as an antenna analyzer in most cases.
I have tried to use it to tune up a set of WP-639 WACOM 2m cans. Seems to do well, except I cant get the RX-side notch right. It SHOWS to be tuned, but then my little repeater setup still desenses itself. I have calibrated both just the nanoVNA and with nVNA-Saver software, and still just couldnt get it right. A friend came by with tracking gen/Spectrum analyzer and that did the trick. If anyone has any tricks for this setup, Im all ears. Still a neat little toy for $50-ish
I don't know what frequency span you were using but that may have been an issue. The NanoVNA only uses 101 frequency measurement points so details may get lost in wide frequency sweeps. My NanoVNA is very accurate in frequency (within 1 or 2 Hz at 10 MHz at room temperature so I doubt that frequency accuracy is the issue assuming yours is similar. For tuning the filter notch it may be worthwhile to narrow down the sweep just around the desired notch frequency. Because of the somewhat limited dynamic range of the NanoVNA (maybe 40 - 50 dB), you probably won't be able to see the actual depth of the notch (likely on the order of 80 - 100 dB) but you will certainly be able to get the notch centered accurately on the desired frequency. The NanoVNASaver application does have the option for averaging which should extend the measurement dynamic range but I have not yet experimented with that feature. Yes, the NanoVNA is a great tool at an unbelievable price!!
I agree the dynamic range of the NanoVNA isn’t adequate for doing the RX notch of a duplexer. That’s a very demanding measurement compared to things one would typically use it for on the bench.
FYI, I had previously only tested my NanoVNA up in the 700 MHz region to see what kind of dynamic range was possible. I just did some testing in some HF bands and also at 2 m. In the HF range I was pleasantly surprised to find that my unit has better than 80 dB dynamic range for transmission S-parameter magnitude measurements and better than 70 dB at 144 MHz! Averaging should extend the dynamic range even further. I'm impressed!!!
900Mhz is getting cheaper https://de.aliexpress.com/item/4000...3.0&pvid=d4bb7f20-a5de-4af1-934a-36f054ce5e91 cause new one is here https://de.aliexpress.com/item/4000...chweb0_0,searchweb201602_4,searchweb201603_53
There is one for a bit more $ at around 130$ USD that will do up to 1Ghz with a built-in Battery. I ordered this one instead of the one shown as it has more accessories plus the battery.
Bought this on ebay for the Nano VNA https://rover.ebay.com/rover/0/0/0?mpre=https://www.ebay.com/ulk/itm/174039026524
I downloaded the NanoVNA Saver software but I could not get laptop to talk to to the Nano. I am using Windows 7, is that likely to be a problem? Do I need to download a USB driver for it?
I had a similar issue. I looked in Device Manager and it said that a driver was missing. After some web searching I ended up downloading this zipped up suite of drivers: en.stsw-stm32102.zip This has drivers for 32bit and 64bit Win7 and also Win8 Looking back in my browser history I think I got it from here: https://www.st.com/en/development-tools/stsw-stm32102.html
