RF bridge functionality ????

[koontlim]

I'm using the RF bridge to combine 2 signal source for TOI measurement. Anyhow, would like to know is there any others alternative way to combine 2 signal source with a good isolate btw 2 port. Need help !!!

 

[toonafishy]

Use an isolator on each signal source. That will give > 20 dB isolation.
Then combine with a reactive combiner such as a wilkinson and that will give another 10-20 db isolation.

 

[Grig]

Hi

You can use single AM (DSB-SC) modulated source to have two tone

Regards

 

[koontlim]

For TOI measurement, to combine 2 signal source, we have a lot of choices (Rf bridge, directional coupler) but most important is the accuracy for the measurement. I think the key spec to be consider are:

Key spec to be consider:
- directivity
- SWR
- coupling factor
- transmission loss
- input power

My concern is will this spec have a lot of influence at low freq such as 100 kHz - 300 kHz? What if we don't have good isolation from 100kHz - 300 kHz?