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What happens if you increase the sampling frequency?
The higher the sampling frequency, the easier it is for a low-pass filter to extract the original signal with no (significant) loss of information, because the filter transition band falls between the copies of the signal spectrum.
How do you convert sampling to frequency?
The sampling frequency or sampling rate, fs, is the average number of samples obtained in one second (samples per second), thus fs = 1/T.
What happens when you decrease the sampling frequency?
As the sampling frequency decreases, the signal separation also decreases. When the sampling frequency drops below the Nyquist rate, the frequencies will crossover and cause aliasing. Experiment with the following applet in order to understand the effects of sampling and filtering.
How do you choose sampling frequency?
The sampling frequency should be at least double the maximum frequency. If your measurement is done in the pass-band (2.38 GHz-2.46 GHz), so the maximum frequency is 2.46 GHz which means that the sampling frequency should be at least 2×2. 46 GHz = 4.92 GHz.
How is FFT frequency calculated?
In an fft frequency plot, the highest frequency is the sampling frequency fs and the lowest frequency is fs/N where N is the number of fft points. As the lowest frequency resolved is =fs/N then the frequency resolution is fs/N. fs=> 2 fmax with fmax is the maximum frequency contained in the waveform.
How to change the sample rate in sdrplay?
First of all, change the mode to ZIF (zero IF). This will give you access to the Sample Rate (SR) and Decimation boxes. You should see these roughly central in the panel. The lowest SR is 2 MHz, so if you want a smaller span you should click in the Decimation box to bring up a division number.
Is there a direct sampling mode for SDR?
The direct sampling mode was originally discovered and discussed in this Google groups thread. YouTube user Superphish was able to receive HF AM broadcast radio, and a decode a HF weather fax signal at 5.8MHz using the direct sampling mod. The hardware mod is quite simple for someone with good soldering skills.
When to use digital noise reduction on SDR?
SDR# Digital Noise Reduction It is useful to turn on digital noise reduction when listening to weak and noisy analogue voice signals. This setting will attempt to reduce the background ‘hiss’ sound. There are two DNR options available, IF and Audio.
How do you change the bandwidth in sdrplay?
BTW, I forgot to mention that to get a 10 MHz span, just press the SR button and select 10 MHz from the menu. Then press the DEC button and select 1. To get a 5 Mhz span, use a 10 MHz SR and select a DEC of 2. Once you’ve seen how the numbers interact you’ll be able to work it out.