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voice FM modulate on VCO

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7rots51

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hello

How can I FM modualte of ADF4118+POS-100 VCO(minicircuits) ? my signal is filtered voice signal with 300hz to 3khz bandwidth.

my carrier is at 120MHZ.
 

pulsarfm

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The POS 100 is intended for 50 - 100Mhz purposes.

I think the POS 150 will suit you better if you want to use it on 120 MHz

3kHz bandwidth shouldn't be a problem try to set the 120 Mhz at the half of your tuning voltage from the pll.




Replace the Vtune for your PLL tuning voltage
 

7rots51

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what is the relationship between PLL loop bandwidth and signal bandwidth?

which of them should be greater?(when apply signal to Vtune)
 

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