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In a message dated 15/02/2005 09:03:50 GMT Standard Time, sthed475@telus.net writes:

Has anyone details or thoughts of these circuits?

I am very curious of personal experiences with performing power combination with two transmitters.

Regards,

Scott

Check the status of radio beacon 'TIL' in CN89lg at:
www.scottboxx.com/radio

Hello Scott.

Couldn't get into the link this morning....

Spooky........I've just built a wilkinson splitter today for 67MHz.....

I have made wilkinson splitters for a variety of frequencies but never as low as 136kHz.

The standard UHF / microwave wilkinson is made with two quarter wavelengths of transmission line. 75 Ohm coax or the microstrip equivalent is the norm. No chance for that on 136kHz (or drums of cable!) The cable idea works well from 10m to 70cms above that microstrip normally takes over.

The other technique is to put the usual balancing resistor of 100 Ohms between the two 50 Ohm sources (same phase) with a capacitor of XC 70 ohms to ground on each source. The two signals to be combined are then each fed through an inductor also XL = 70 ohms and joined at the far end.

The final component is a capacitor of XC 35 Ohms from the junction to ground.

All you are doing with the capacitors and inductors is simulating the properties of a quarter wave length of coax, but with discrete components.

I've run 250 Watts like this and seen it done to 600W from 2 300W sources on 2m.

I look forward to seeing how you get on

Good luck

David G0MRF