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 Home brew RF combiner / splitter "tuning" qestion 
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Post Home brew RF combiner / splitter "tuning" qestion
I built this lumped component combiner to run two lowish power, cheap to build Class D amps combined on 137khz. (2200 meters) Whilst it worked the drain waveforms were like those into a very poorly matched antenna load, so I went with a Wilkinson using ferrite beads to make two lengths of Teflon co-ax act as 1/4 waves and a ferrite cored auto transformer. This works well but I want, for the knowledge, to see if I can make the lumped component one work properly. I believe this to be a narrow band, high Q device. Given I have a decent sig gen and scope and access to a very decent SA, can anyone explain in simple terms how I might "tune" it with regard to coil turns or cap values, on the bench, at low power as from the sig gen, to better resonate it please? Thanks. I link to the lumped device and the schematic of the Wilkinson with ferrite, albeit I now use an auto transformer unlike the schematic.

Lumped component I want to tweak to my desired frequency is at: ... -combiner/

Combiner that works fine :

Thanks for any replies.

Thu Jan 11, 2018 9:41 am
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