|
The smoke test of this Wilkinson Combiner was
successfull in that no smoke came out and nothing died. However, we get
enough heat to cook an egg on the 100ohm balance
resistor.
We have a scope match on the output to the dummy
load and it shows about 225W from one transmitter, add another and we get 450W,
success NOPE! The transmitters are outputting ~450W each! Therefore, half
the power is being absorbed in the 100ohm balance resistor. Examining the
phase relationship of the input to the combiner waveforms indicates they are in
phase within ~10degrees and almost equal in amplitude. So what
gives! Anyone have some idea what may be going wrong? Of course we
have checked and doubled checked the circuit for errors and nothing... All
seems as it should according to formulas and drawings we have viewed and
designed it from.
Does anyone have an idea how we could troubleshoot
our way through this?
Any advice would be appreciated.
73 Scott and Steve(It's all his fault
;-)
| 