[Discuss-gnuradio] BPSK demodulation

Hello, If UHD source acts as a mixer, why some examples (like usrp_rx_hrpt) use baseband information as the input of a PLL? Thank you in advance ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org

[Discuss-gnuradio] aUaU FM receiver

Hi, I built a FM receiver working with a LiveUSB and a USRPB100 device. It worked fine, but when I installed Ubuntu and GNURadio in a virtual machine, the audio is distorted. The console types ‘aU’ letters. But I generate a wav file and the quality is good, the problem is with the audio sink.

[Discuss-gnuradio] Costas loop in HRPT receiver

Hello, I’ve heard about costas loop to obtain the carrier of a PSK signal. But I don’t know how it is implemented the carrier recovery in the hrpt example of gr-noaa in order to demodulate the BPSK signal. I would appreciate some help with this topic. Regards, Pablo.

[Discuss-gnuradio] Clock recovery in HRPT receiver

Hi, I am checking the HRPT receiver available in gr-noaa repository and I don't understand the parameters of the Clock Recovery block with the information available about the HRPT format. I roughly know how that block works, but Ineedmore information. Thank you in advance. Pablo Fernandez.

[Discuss-gnuradio] How to build an HRPT receiver with USRPB100

Hello, I've searched some information about HRPT format. I know the modulation that is used and the frame format, but I have no idea how to built it using GNU radio. Furthermore, I checked the gr-noaa repository but it hardly appears information about the different block used for HRPT

[Discuss-gnuradio] How to check that HRPT receiver is working

Hello, I am working with the HRPT receiver’s files included in gr-noaa and I don’t understand how them work because several blocks are created and use different parameters that are not explained so I’d appreciate your help to understand them. Also, in case I understand them, if I want to check

[Discuss-gnuradio] Noisy APT images

Hi, I'm trying to receive APT images from NOAA with a QHA antenna and I received noisy images. I use a usrp source block, then a low pass filter with 50 kHz of cutoff and 20 kHz of transition width, then a WBFM receiver and a resampler connected to the audio sink. I think that I should change the

[Discuss-gnuradio] HRPT receiver

Hello, I was wondering if someone can receive hrpt images from NOAA satellites or similar, if so, could you help me with the implementation of the receiver? There is not quite information about that format, so if you could help me I would really appreciate it.

[Discuss-gnuradio] LPF in FM receiver

In the FM receiver: Why a LPF is used instead of a BPF in order to select the Radio channel that we want to hear? That is the only part I don't understand. ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org

[Discuss-gnuradio] How to set the bandwidth in WX GUI FFT Sink

Hello, I have a USRP B100 from Ettus and I am receiving FM Radio. I plotted the RF Spectrum and the baseband spectrum in a notebook, but I don't know how to change the frequency axis or zoom in the graph. I want to know if it possible to change the frequency in the same graph as well. I tried to