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The two generator have to be isolated one each other to avoid intermodulation. To combine them you could use a directional coupler with high isolation and low coupling factor.
The blocking signal has to be connected to the main line and the wanted signal to the coupled port.
In any case I think the noise could be due, instead, to the blocker generator itself. In this case you should use a very narrow bandpass filter.

[QUOTE="albbg, post: 1774528, member: 265393"] The two generator have to be isolated one each other to avoid intermodulation. To combine them you could use a directional coupler with high isolation and low coupling factor. The blocking signal has to be connected to the main line and the wanted signal to the coupled port. In any case I think the noise could be due, instead, to the blocker generator itself. In this case you should use a very narrow bandpass filter. [/QUOTE]

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