Mad electronics


“RF power divider” with 51R resistors in star configuration

Keep your eyes open when shopping on AliExpress. This device was supposed to be an RF 50-Ohm power splitter. With 51 Ohm resistors in a star configuration it’s a 153 Ohm system power splitter, not a 50 Ohm one. Instead of 51R there should be 16.67 Ohm (or close to) resistors.


and so on.

So far I have found only one correct item with a star configuration and 16.5R:

Another working alternative is to use triangle configuration (with which Chinese developers seem to have more luck):

Triangle power splitter. 51R here is appropriate (though 49R9 would be better)