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This is a project that has been gathering dust. It's time to make it happen.
This is a 7 GHz amplifier from RF Technology Inc. The plan is to move it to 10.368 GHz. To do that, I am replacing the last two FETS with devices that will operate at 10 GHz. (Bought them off ebay, but I forget where I put them at the moment)
The isolators at the front and rear will have to go. The one at the output drops through the bottom of the case. I'll probably move the output line to the power detector output at the lower side since it comes out to an SMA. That will bypass the filter on the output as well, so I don't have to retune that.
QUESTIONS:
1) The 1/4 wave lines from the gates and drains.... I need to retune those. Can I leave the existing square foil and add (how?) a radial stub at the appropriate location on the skinny line?
2) This thing has a marking on the side of it that says: 34.6 dB gain. It had a lot of foam in it. Should I only use the last 2 stages and stay away from lots of gain in the whole box?
Can I simply leave the silver rectangles and add radial stubs at the appropriate locations? (in red)
How can I add radial stubs? Can I just epoxy down a piece of copper and mash it to the PC board and hope to get it flat? Will that work?
Any other suggestions? Discrete inductor maybe like lower frequency amplifiers?
The final mods would be in the red below. This does not take into account the tuning necessary around the FETs.
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