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You're right, I didn't see that. With the NanoVNA off, there shouldn't be a voltage supplying the IC, resulting in 4V on the Vbat terminal. Looks like a problem (defect?) in the IC or circuit. Maybe

Rich, Vdd is NOT what the 5303 is putting out - that is 5V Vdd? IS? the output of the LDO XC6206P332MR? 3V regulator. Check the attached schematic.

Not re. what the voltages or the circuit *should* be. That should never happen; it's a problem in your IC or circuit. Vbat should *never* source a current. Raymond

You mean this? I don't think you saw it earlier ... With unit OFF (USB NOT plugged in) Actual V at battery terminals = 4.13 V Actual voltage at cathode of diode = 4.14V

Under very carefully controlled circumstances you can use the nanoVNA as a poor mans spectrum analyzer /g/nanovna-users/topic/34079496#3464 Or better said, as a tunable power meter as

I don't deny any measured facts. I know what the circuit is - or is supposed to be. I *don't* know what your NanoVNA behaves like, apart from what you describe. Either the diode is leaky (which to me

Hi Barry, You will have no issues using that battery as long as you keep the original protection PCB (the small board inside the battery). Look at some of my posts - I use a cellphone battery as-is.?

Nope ... just checked it with the battery pulled - it has 0.243 V drop. So do the other diodes I purchased that are unused. No, there is a misunderstanding of the voltages in the IC or the circuit

Hi Mike I get where you are coming from...but it's the drop /across/ the diode that is important. It's not what the batt has, or what VDD is, it is what VBAT sees. The USB and the batt both feed the

My Schottky diode wasn't one of those. Schottky diodes tend to (forward) leak a bit more than regular good PN Si diodes. I replaced the Schottky with a regular PN Si diode and now my voltage

No misunderstanding of functionality. Your diode is leaky I guess. I'm not sure about the current (through the diode) into the Vbat connection (going to measure that one of these days) but in my case,

I don't know this but I was once warned about attaching a large external battery to a UPS box - you might overheat the charging circuit on the board - because it was only designed to maintain a

It is NOT achieved though ... that's my point - it doesn't do that. It isn't preventing the 4V Max rating from being reached with the other components in the unit such as the actual battery supplied.

--------------------------------------------------------------------------------------------------------- You'd be surprised how many under warrenty Tracfone smartphones are still at version 4.4 :) My

Hi folks, I just happen to have a spare 3.7v 2Ah battery from a new Baofeng 888 hand-held which has been stripped down for use in an Allstar micronode. I can't think of a reason why this should not be

It's not an error. The diode is just there to prevent Vbat from ever exceeding the IC's absolute maximum rating of 4V. With either a Schottky or traditional Si diode, that is achieved, because the

Yup - about 600mAH? I raised the rear cover using an extra 2mm using a small hex nut under each (longer) screw and it works great. I'll have to see how long it runs on one charge. The only issue I

I have all instruments and tools to exactly measure the voltage behavior of my NanoVNA. I'll try and find the time one of these days. Raymond

I don't think users running android 6 or less have to worry about warranty at this point.

Hi Vaclav, (or is it Sal?) Welcome to the forum.? The wiki and files sections of this forum are evolving carefully in order to provide members with specific device and theory related information. I