Using Modulation Toolkit with M series DAQ

[JSflow]

Hi,

I have modulation toolkit for LabVIEW and also M Series DAQ card.

I am acquiring AM modulated signal using DAQ card.

Can I demodulate this signal correctly with DAQ card? There's no example program using

Modulation Toolkit with DAQ. Only Scope and RFSA example are provided.

Signal I am acquiring is AM modulated with carrier signal being 100kHz, and message signal 100Hz.

Thanks

[Kalyanramu]

Hello,

What type of AM Modulated signal are you acquiring? Double-sided or single-sided (upper or lower)?

The type of modulation would dictate the bandwidth of AM signal. For simple discussion, let's consider that it is DSB (Double Side Banded).

This means that the bandwidth of AM signal for your case is baseband frequency+ carrrier frequency = 100KHz + 0.1KHZ =100.1KHz

For this frequency band sample approximately at 1MS/s if you are interested in time-domain signal (roughly ten times) using M-Series DAQ card. I am not completely sure how your setup is (do you have a downconverter module from NI?). However assuming that you acquired the AM modulated signal using M-series DAQ card, you can perform software downconversion and demodulation using Modulation Toolkit.

Use MT Downconvert Passband.vi and MT Demodulate.vi and enable filer in MT Downconvert and select appropriate filter settings.

This should helpful you out. Let me know if you have questions or concerns. If you can post detailed description of your application, it would be more easier to help you out.

Thanks,

Kalyan