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For single frequency only. Very high Q at 2,4 GHz? For example, if VCO have -105 dBc@10 kHz, your resonator must have 85dB attenuation at 10 kHz offset. So, it's practicaly impossible for single frequency too.
PIC16xx is more tolerance to EMI then many other MCU's. I newer have any problems with this MCU's (possible because of asm programming... :-) ) Caps near xtall MUST BE. Some examples of MCU can start without it, but it will not be good work. About serial resistor with MCLR pin: without this...
micronetics vco
Look for Ulrich Rohde books about VCO and RF communication equipment. I've find them in Internet.
Another way to build wide band VCO is varicapless current tuning multivibrator. Possible it will be better then VCO with bb833/bb857 or smv1265
vco 2ghz
It's not a good idea to use max2620. I've try it two or three times, and have problems with quality of thouse IC's. Possible it was counterfeiht.
It's impossible to build so wideband VCO; but you can use DDS.
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