Heel handig maar een frequentie sweep maken, bijv voor S11 is heel lastig met register aansturing. De code daarvoor van AD lijkt incompleet

Works as advertised, all the way up to 4.4 GHz. Output amplitude is variable, +5 dBm to -4 dBm, as expected.

I can't download the file without making an account on that chinese website, well small problem it doesn't accept phone numbers from all countries so I can't download it, pls provide a diffrent download link thank you in advance

Able to generate frequency.

Funziona perfettamente, occorre ricordarsi che l'interfaccia SPI è a 3,3V, pertanto con un Arduino nano occorre un traslatore di livelli che nel mio caso è stato realizzato con un semplice partitore resistivo. In rete si trovano molti schemi e firmware per non partire da zero. Suggerisco di realizzare uno di questi e, una volta presa confidenza, pensare la propria applicazione. Ovviamente suggerisco un Arduino qualsiasi e l'IDE relativo per la scrittura e compilazione del codice. Per i neofiti, si tenga conto che solo col PLL ADF4351 non si fa nulla quindi, se non s'intende affrontare anche qualche piccola complicazione di elettronica digitale, suggerisco di lasciar perdere.

At less than twice the retail price of the ADF4351 chip, this board is a bargain for those who can drive it. The adjacent pair of SMA connectors are complementary (i.e. 180 degrees opposed) RF outputs. Their waveform is essentially a square wave, with an amplitude controllable in 3dB steps over a 12 dB range. The SMA connector on the other side of the board can be used as a 25 MHz crystal output, but is intended as a reference frequency input. To use it as such, two surface mount components should be unsoldered from the board to disable the on-board crystal. An external reference is attractive because of the poor spec. of the crystal provided. Mine was 9 ppm low, and quite temperature sensitive. Frequency range I found to be 32.2 MHz to 4.48 GHz, slightly exceeding the specification.Some of the blurb is misleading. The "auxiliary RF output" does exist, but only as pins on the ADF4351 chip. Good luck with that.To control the board, on-board registers must be written via the serial SPI lines, and continually rewritten for each new frequency. For this you need either to find a useful program, or write one yourself. The latter is not for the faint-hearted, the difficult part being not the SPI transfer, but deciding what data to load into the registers. Start by reading the Analog Devices data sheet, and look for writing by Robert Brennan on integer boundary spurs.The attached picture shows the board driven from an Arduino nano. The blue LED at the top of the image lights up when the PLL is locked.EDIT: When the second unit arrived, it turned out to have an intermittent crystal module, which was not fixed by resoldering, and an open-circuit PCB track that I managed to wire around. Two separate faults on a small board is bad. Reduced rating by one star in the hope that the bad unit was a freak, rather than the other way round.