----- Original Message -----
Sent: Monday, February 28, 2005 10:51
PM
Subject: [LW] ... --- ...
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
;-)
