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It doesn't work. The circuit board has wiring errors which most engineers can find and fix. Other reviwers have said as much. It was never tested at the factory. The soldering is of poor quality and the flux not removed. The best that can be said is that you have purchased a kit of components which you can rewire. Since the components are all passive, they're hard to damage. Don't buy this thinking you can repair it unless you have an VNA to check your repair. Once I fixed it, and put it in a decent enclosure, it works close enough to spec. The original design was a good one.
Verified purchase: Yes | Condition: New
As received, this item did not work properly. I believe there are errors in the board layout. The errors can be corrected with minimum effort and the device made usable for ref. function and specifications. It appears the design was an attempt to "Chinese Copy" an original working Ukraine design. 73 W4TTU
Verified purchase: Yes | Condition: New
The basic concept is that, when driven by a signal into 'Input', a receiver connected to 'OUT' should receive substantially different signals based on differences between 'REF' and 'DUT', which should be nominally symmetric. That is NOT the case for the device received. In attached plots, yellow trace is log magnitude return to VNA TX port, and blue trace is log magnitude signal received by VNA RX port for 104kHz to 1.975MHz. First plot is with 50 Ohm REF and 50 Ohm DUT. Second is with 50 Ohm REF and open DUT Third is with open REF and DUT Last is with open REF and 50 Ohm DUT In case traces get scrambled, blue trace mostly depends on REF, independent of whether or not matching DUT, so far from ideal. These results suggest wrong or poor soldering and/or components.
Verified purchase: Yes | Condition: New
As advertised Have not had time to use it, so can not accurately tell you my opinion!
Verified purchase: Yes | Condition: New
the device did not work, had missing parts. poor copy of the original.
Verified purchase: Yes | Condition: New