Is it worth its price? Most likely it is!
Some classical Chinese problems:
- they have spared two cents on the case (is it worth to make one from brass? – b/c the magenta ray is shivering …)
- instead of 1) open, 2) closed and 3) 50 Ohm load pieces, my calibration kit had two 50 Ohm pieces and no shorted (closed) one. Well, I made one myself, from a SMA female connector. Actually, two 50 Ohm pieces are useful for the “Isolation” step of the calibration sequence.
- the menu wheel is so unreliable that better prepare to find another. Be patient, the menus lag a little bit.
- the Chinese logic to increment/decrement is the opposite to the western one (but you already knew it, did you?). To raise the value, turn the wheel into WRONG direction!
- the overall menu logic is a very nasty oriental one. (Long ago I bought a good phone for cheap, because westerners were in love with the No-Kia style occidental menus and they were unable to work with the oriental menu style. The same disease infects multiple rack synths.)
- after switching the device off, the green “battery” LED continues glowing, which is a bit of frightening the very first time. However, it only does so for about a minute.
- It is small. I mean it – SMALL. It might be unsuitable for big men with large hands.
- the manual is extremely vague on the calibration route. If no previous experience with similar equipment, you probably will never finish the calibration. Oh yes, and do not forget the RESET before the calibration 😉
Now the positive side:
- it REALLY works, i.e. it is possible to check cables, tune filters (S11+S21) and have an S11 idea about how are your UHF and VHF ham bands antennas doing. For a broken N-SMA piece on the roof, the Schmidt chart was showing the capacitive coupling … that is rather logical.
- it is easy to take to the roof (e.g. in your pocket). You need to cover the direct Sun to see the screen in the middle of the day, but this is a nuisance.
- the documentation and firmwarez are downloadable. E.g. from here: hXXps://share.weiyun.com/5HFmWGl
- heh dudes, the touch-sensitive screen ;). Well, but considering what a quality the menu wheel is, this is the only option to work.
- the battery really lasted for 2 hrs, as advertised.
- amazing – the charging cord is of USB-C type. And the device continues working when on charge, that is a bit of amazing, too.
- you can prepare your favorite sweeping boundaries and save/recall these (altogether 5 independent memories).
- it has four rays (using the CRT terminology) – yellow, blue, magenta and green one. The menu system lets you to assign these colors to various functions. In that respect, some ad pictures are rather misleading. In reality you can switch off the rays you don’t need.
Oh yes, and the source code is available on Github. It should, considering the origins 😉 Surprise! Even a due credit for edy555 is there.
Disclaimer – I did not try the Chinese s/w – for obvious reasons.
But Rob claims, it is working .