Re: uBITX schema relay K1 #ubitx

Brian
 

I agree Fred, it adds a feedback path around the TX amplifier which has quite a high gain. There is a potential for parasitic oscillation at some frequency and that will be affected by the load. It might be a good thing that the IRF510 does not give a high gain at high frequencies. It needs to be carefully checked out with measurements. Add-on linear amplifiers avoid the problem by only having 10 to 20dB gain.
73 Brian VK4BAP

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