Hi Steve I have just had a thought your construction looks fine....BUT maybe
the two coils are too close together and there is some coupling. I wonder if
it is possible to temporarily turn one at right angles to kill any coupling
and see if that helps??
The biggies in my Web page were made with big toroids I believe probably
iron dust rather than ferrite, as the inductance reqquired is not that high
Cheers de Alan G3NYK
----- Original Message -----
From: "Scott Tilley" <[email protected]>
To: <[email protected]>; <[email protected]>
Sent: 01 March 2005 06:51
Subject: LF: ... --- ...
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 ;-)
Check the status of radio beacon 'TIL' in CN89lg at:
www.scottboxx.com/radio
|
