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I have been hacking my Gecko unit to add shields and I also decided to add an SD card slot I removed from an old Blackberry cellphone. As I mentioned in a previous post, old 2-way radios and

Hi Ernst, I have updated with nanoVNA_800_aa_20190705.dfu and no more spikes are present. Thanks. Georges.

I have not taken enough 1 port data between the two to state their measurement delta if any. As far as I can tell, the white unit is no different electrically other than the firmware, 2 track display

Oh well, I guess I spent money for naught?? Maybe I'll save them for another project. I'll check the date code, they still could be old stock Thanks Frank

I looked at the part, and they are 602. I'll replace them and add shield cans (there are none) and I paid $75 for this one. Oh well live and learn

Hi Georges, those peaks are from the ocsillator circuit. Hugen - great thanks to him for immediate action - has released another firmware nanoVNA_800_aa_20190705.dfu and nanoVNA_800_ch_20190705.dfu

Hi Ernst, I have the exact same 300MHz, 600MHz peaks. I'm actually trying to full charge the battery before making any measurement. I suspect the LiPo switching battery charging circuit to generate

My white version. I added the RF shield cavities using kapton tape to isolate the electronic and coper foil as RF shield, soldered in each corners. No more signal variation on the mixers when

Is this black one, better than the white one? If so, do you have a link to buy it off the ebay ?

Thanks, so much. I got my nanoVNA working on my computer now. Who knows who... could, perhaps take a paid commission to make one of these nanoVNA systems but with more data points ?? Greg

This one sounds exactly like the one I bought from Bangoods

I 'thought' the factory making SA602 had burned down ages ago so all chips manufactured were actually SA612. So will be the same chip (especially if the SMT version). Info here although pretty sure

I looked at my white Gecko, and they are 602's, so I just ordered 4 to replace my 3 (1 spare). They were $1.41 each,, bus ground was $9.26 from?? Newark

I have a white Gecko unit - and I have ordered another unit from Hugen via taobao which is waiting to ship. I agree there are issues with the bridge. Above 300MHz return loss measurements become

Thanks for sharing. Quite interesting.

Hi,David NE602 = SA602 = NE612 = SA612 http://soldersmoke.blogspot.com/2009/06/na5n-on-ne602.html Adding shields should improve performance, but some bad modifications on the PCB can also reduce

Nicely done, thanks for sharing. Stuart K6YAZ

Here is a 9 MHz crystal filter which is matched to 50 ohms. The response is in good agreement despite not re calibrating over the proper passband range; say 8-10 MHz. Instead I used the 50 kHz - 900

Ahhhh... Great and thanks! ________________________________ Sent: Monday, July 8, 2019 11:12 PM To: [email protected] Subject: Re: [nanovna-users] New nanoVNA received Alan, the green strip

Alan, the green strip you mentioned belongs to the protector film. It should help you to to pick it off, after removing the front plate. Ernst