USRP2900 - RX AM Demodulator (listening Air Traffic Control)

[Thierry.LE_GALL]

Overview

This *.gvi is a receiver (RX) which demodulates Amplitude Modulation (AM) used for Air Traffic Control in a real-time processing, with MathScript in the loop for the implementation of the squelch function. The *.gvi plots the AM signal (temporal + spectral views) and sends the demodulated signal to the loudspeakers of the host. Useful to learn AM demodulation and first integration of a MathScript in the real-time processing loop.

Description

Hardware and Software Requirements

USRP 2900 + VHF/UHF antenna
LabVIEW Communications System Design Suite 2.0
PC host / Window7 SP1

Steps to Implement or Execute Code

1. Plug the NI-USRP 2900 to the host (USB3)
2. Launch NI-USRP Utility and check USRP2900 conexion to the host
3. Launch LabViEW Communications System Design Suite 2.0
4. File/New/Project
5. Navigation Pane : Untitled Project -> right clic + Add File...
6. Add File : rx_demod_am_usrp2900.gvi

7. Add Files : Simple Resample.gvi, Simple Sound.gvi
8. Run (0 errors, 4 warnings).

Additional Information or References

[Romaro]

the file is still loading for long time and not running as mentioned in the Below Screenshot :

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@Thierry.LE_GALL wrote:

Overview

This *.gvi is a receiver (RX) which demodulates Amplitude Modulation (AM) used for Air Traffic Control in a real-time processing, with MathScript in the loop for the implementation of the squelch function. The *.gvi plots the AM signal (temporal + spectral views) and sends the demodulated signal to the loudspeakers of the host. Useful to learn AM demodulation and first integration of a MathScript in the real-time processing loop.

Description

Hardware and Software Requirements

USRP 2900 + VHF/UHF antenna
LabVIEW Communications System Design Suite 2.0
PC host / Window7 SP1

Steps to Implement or Execute Code

1. Plug the NI-USRP 2900 to the host (USB3)
2. Launch NI-USRP Utility and check USRP2900 conexion to the host
3. Launch LabViEW Communications System Design Suite 2.0
4. File/New/Project
5. Navigation Pane : Untitled Project -> right clic + Add File...
6. Add File : rx_demod_am_usrp2900.gvi

7. Add Files : Simple Resample.gvi, Simple Sound.gvi
8. Run (0 errors, 4 warnings).

Additional Information or References

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[umairpak]

Romaro,have you find the solution

[umairpak]

Did you figure out this?

[HangHu]

Hi community,

I have replaced the broken "Simple Sound.gvi" file and run the program. It gets the following results, but there is no audio even though the spectrum analyzer can find a peak at this frequency. Can anyone give some suggestions? Thank you very much.