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An observation was made a while ago on this list that some of the discussion had descended into what the poster considered a bit abstruse for more general readers. I'd like to insert the observation

OK, I've done another test, similar to your original test Jeff, and the plot thickens somewhat. Procedure was: I did a calibration on the 8753, and on the Nano, using the same OSL standards from the

'scuse me? The chips on the battery are ONLY for overcurrent and under voltage. The charge controller is on the main board. It's the 8 pin dip above the 2uH choke. It's a combination LiIon charger

Hi Mike I see them…. but I guess I would question why you are worried about it. That spike will have no meaningful impact on any measurement you make. I would be interested to know though how the

Hi Larry, Please be aware, that the charging chips (x2), are mounted on the Battery. Actually within the transparent heatshrink wrapper of the Battery itself, not on the nanoVNA Board! Or at least on

Hi Warren Good thought about the bin boundaries, worth further investigation. I'm definitely seeing a 600MHz spike as well at times though, see attached photo. (Apologies for the poor quality.) Any

No apology needed. My comments can be acerbic at times…. One additional point. While 80 dB of dynamic range is “better” than 70 dB, I would be very interested to know who has a requirement that

If you already have a small LiIon cell that will fit inside without being pinched by anything on the PCB, go for it. There is a datasheet for the charging chip in the files section so you can get an

Thanks for the tip! The batteries I have lithium with the protected circuitry and would slip right into the gap where one should presumably be. I'm just worried about the voltage. Of course I guess I

Hi Frank, If you dont mind a thin battery stuck to the rear of the unit, you can use any lithium device from a cellphone. Just solder leads from the battery to the spots on the nano. The nano already

Thank you, Sir.

Makes sense, my apologies for the snark. It would be amazing if this thing worked properly with such a huge dynamic range. Having messed around with the si5351 myself, I'm fully on board with the

So I picked one of these up with minimal knowledge on what it can even do, but in looking around it seems these are supposed to include a battery. Mine does not. I've looked at the PCB directly and

Jerry My NanoVNA is operating on the fundamental at 300 MHz and on the third harmonic for the rest of its range. It has no trouble getting to 300 MHz. It can, at times, display a spike at 300 MHz but

Ah, so you did see it. You just didn't believe it is all.

Warren, Perhaps you didn't see this post: /g/nanovna-users/message/1315 He reports significant differences between various clones. Granted, there are also reports here from people who

I have reviewed the entire thread. The only difference I see is a reported difference in dynamic range and, as you can see, I have questioned the measurement. Since the screen only displays 70 dB of

Please see this thread: Your NanoVNA version - good clone, semi-bad clone comparison

I actually question whether or not the “spike” is “real”. And I further question whether it actually affects operation. There is a discontinuity at 300 MHz in the NanoVNA. The Stimulus is

Done! Relatively painless. Thank you very much!!!