FM modulation and demodulation

[621846]

Hi

I am using DAQ PCI-6120 with labview 7.1 to modulate and demodulate signals, so I use 40 KHz as carries and the massage is 100Hz  

How can I get the 40 KHz  back after demodulation  

the function (demodulation FM) there is not any option to get carries signal back (40 KHz)

I am locking forward to response me

Regards

Fouad

[JamesC]

Hi Fouad,

Can I first ask why you want the carrier frequency back? Surely you know the frequency as you need to tune into it to pass the waveform to the demodulate VI. You could try putting an indicator on the carrier offset and see what that gives you back.

If the output is only a few Hz, then use your known carrier frequency and an addition function, wire in the offset and you get the absolute frequency of your carrier signal.

Regards
JamesC
NIUK and Ireland

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[621846]

Hi

I couldn’t see any result from carries offset  

FOUAD