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It is very difficult to find VCO with this range 4:1 it will be exotic and expansive thing with non usual working conditions Vtune to 30V?? and lot of power consumption . It is better to use mixing solution. VCO normal range 1:2 (a lot of company produce it) and mixed with fixed frequency. For example: fix frequency 1.5 GHz and VCO from 1.7-2.5GHz wanted frequency separate wit low pass filter at the out of mixer.
GL XTASA
:idea:
Maybe the simple solution for your problem is to take 2 VCO from some producer MiniCircuits for example and made simple PIN diode switching between them. But it is also problem you need aditional comand for VCO changing. PCB will be simpler but still more complicate than 1 VCO.
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