mod demod

[afatbahmed]

i am simply fm modulating and demodulating in one vi. i am giving an input to modulate vi and retrieving through demodulate vi. it is not same. where am i wrong? help.

[Speedy_Badger]

Hi,

An initial problem that I see in your VI is that your input data does not have a dt value. What is the sample rate of your original data? The FM modulation VI requires both the magnitude and dt values, otherwise it will return an unuseable waveform at its output.

Try experimenting with the MT Demodulate FM (Simulated Data).vi located in<LabVIEW Directory>\examples\Modulation\simulation examples\Interactive. There is a bit more involved in this example, but it will show you how the modulation toolkit VIs are meant to work together as well as some of the up and downcoversion VIs available.

-C

Message Edited by Speedy Badger on 05-04-2010 09:00 AM

[afatbahmed]

hello chris,

      the initial sampling rate is 1 million.  i am sorry i didn't put in a dt value at the time i was sending you the code. anyway i did put in sample dt values but the recovered data wasn't the same. 

  aftab