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Reference clock source frequency error easily compensate by software in firmware or with external program. i requested it.

In the USA the Dollar Tree stores often have large screen protectors that are labeled for some device but may be adapted ...? kd4e

So it seems that the IP5303 should be replaced.? I opened the unit and found it but don't know where to obtain a replacement part.? My usual sources have no listing of this.? The only data sheets I

So does anybody have a link to where to get screen protectors? I've just had to order a new screen for my NanoVna.

/g/nanovna-users/topic/nanovna_does_not_want_to/32846852

Raymond Domp Frank wrote: I have found that the best and most accurate pointing device to use with the Nano is the stylus from an old Panasonic Toughbook. That was a hardened laptop series that are

Where is this related topic?? I'm not too good with the seup here. Bob

many peoples reported issues with IP5303 charge controller chip. You can find related topic here. It has some workaround for bad IP5303

I went to use my unit today and it came on for only a few seconds and shut itself off. Sometimes it won't come on at all and other times just a few seconds. Any ideas?

There is one item that may have been overlooked. The frequency error of the reference source for the PLL is 0.5 ppm., as used in the VNA. At 70 MHz, that is a 35 Hz error. I did a 6 pole crystal

The software that comes with the AIM4170/4300 can automatically measure crystals.? I have designed about 20 different crystal filters? using this software and the results are virtually perfect with

Hi Alan Oristo just told QRP has the solution Kind regards Kurt -----Oprindelig meddelelse----- Fra: [email protected] <[email protected]> P? vegne af Alan G3XAQ Sendt: 29. oktober 2019

Hi Alan Yes I missed that point and agree 1Hz step is a must. But I have seen mentioned in a posting frequency steps of 1Hz for a special firmware but when and from whom I do not recall Kind regards

you can find firmware here: https://github.com/qrp73/NanoVNA-Q/releases Just tested 0.4.2 supports 1 Hz steps. Frequency steps smaller than 1 Hz is not supported, because frequency is represented with

All the NanoVNA devices use resistive touchscreen devices so it is irrelevant if you leave it on or take it off. However, replacing it with a real screen protector is always a good idea.? ... Larry

This is really a 2nd order polynomial...it seems to be entirely adequate. Higher order (x^3...) polynomials can be made to fit almost anything in a strict range, but IMO much above 3rd is not

More points means more long measurement and more high probability of some interference spike. I think may be there is need for a median filtering, but there is too small memory in order to do median

yes, it supports 1 Hz step, also there is fixed frequency rounding error and it measure exactly these frequencies which are requested. With old firmware versions you will get random frequency errors

At least QRP's recent firmwares accept 1Hz steps, e.g.: scan usage: scan {start(Hz)} {stop(Hz)} [points] scan 10000 10100 100 frequencies 10000 10001 10002 10003 ... 10098 10100

Different types of protectors exist for plastic screens: One is just meant to protect the plastic screen surface from scratches (and fingerprints) while being handled during manufacturing and