Old thread here (it was about the clones of transverters-store 3GHz RF bridges) .. I eventually got around to looking at these bridges.
I ended up with both a blue board and a green board, the latter with red sma caps. The transverters-store apparently ships red caps too, describes a green board but pictures a blue board.
The ones I got both performed badly and were identical. They appear to both have nearly correct coupler wiring : they do connect the core of the second coax(which is shown unconnected in the original site) to the outers. at both ends. Not sure if that matters. They also both had the 100R resistors incorrectly linked but a solder blob sorts that out, after which they behave roughly as I expect.
These were bought in 2019 at the time of that discussion so the situation may be different now. Given that the board only costs $18 from transverters-store.com I'd suggest getting it from there if you want one. I shall probably do that, though I've got some more traditional N-type metal bodied directional couplers on the way.
There's a seller with a large number of the 100kHz - 3GHz Hameg bridges that were built for my HMS-X SA at the moment. Unfortunately he wants ?600 each for them. Which I think is cheaper than Hameg sold them but still out of budget by at least 10dB.
A green (not blue) ~US$10 reflection bridge
e.g. from eBay
with matched SMA references (want a matched pair to calibrate nanoVNA CH1)
Why is a green reflection bridge better than a blue one ?
(Presumably it's not just a matter of preferred colour ..)
Blue are bad clones of transverters-store design and are wired wrong.
