Amateur Radio Stack Exchange
Amateur Radio Stack Exchange

Questions tagged [software-defined-radio]

Radio devices that use digital signal processing in place of analog electronic components to manipulate RF signals.

309 questions
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Multiple simultaneous tunings with SDR

I just found out about WebSDR, and I was wondering how is it possible that many listeners listen and tune to different stations simultaneously. Which components/technologies allow this, and how does this roughly work?
Cobe
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Which qualities/features does an SDR radio device need to be usable for Amateur Radio?

I know what things to note when selecting an analog amateur radio, but SDR devices have completely different specs, e.g. sample rate and resolution. What do I need to know about the device to make sure it is suitable for working Amateur Radio…
jkj
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Is there a name for the demodulation technique described here using the parallax propeller?

Is this a recognized SDR technique with a name, or is just a combination of DSP, r/f techniques ? I asked the author, but didn't receive an answer, perhaps because he thought it was "obvious" (not to me, though, an SDR / electronics…
mstram
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Software defined radio demodulation

I am trying to increase my knowledge on software defined radio and according to what I have read its hardware consists of three parts: Amplifier Tuner ADC I just wanted to make sure that my assumption that the filtering and demodulation is done…
Jack
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SDR as an oscilloscope

Can a SDR be used as a general purpose AC oscilloscope with appropriate attenuation at the front end. Have in mind a capacitor to block DC voltages, large resistor say 10 Mohms to limit current and present a high impedance to a signal & a scope…
Roy Hopkins
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Sampling a 50 MHz Max Frequency 50 MHz BW Signal with a 50 MSps ADC

I paste below a superhetorodyne based Software Defined Radio Architecture for an Rx channel below. Suppose the IF signal has a max frequency of 50 MHz and 50 MHz IF BW. In that case, is it possible to just use an ADC of only 50 MSps for sampling…
Denis
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Can I capture stereo IQ signals from WebSDR?

When I set my sound device to record from the monitor/loopback source, I can capture the signal from WebSDR in my browser in an application like Audacity. Looking at the captured signal more closely reveals that both the left and right channels of…
user15245
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Preamble of a garage door opener

After detecting the transmitted signal of a garage door opener with SDR, is it correct to assume the first repeating pattern of the signal is preamble? I only see two one and zeros with equal intervals and after that there is no pattern. Is it…
Jack
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SDR hardware architecture schematic

Is this a good representation of the sound card SDR systems in which a receiver has a simple hardware detector producing two quadrature audio channels that can be fed to a computer's sound card? What should I put in ???? box? The first schematic is…
Jack
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How to determine the length of a symbol in a wave?

Is there a way to determine the length of a symbol in a wave? For example, how could I determine the length of a 0 or a 1 in a 2FSK wave?
user6561
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Connecting two SDRs together for one to act as a signal generator

If I have two SDRs like the BladeRF and I want to use one as a signal generator and connect them together do I have to attenuate the connections?
dmaynor
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Model of a specific DVB-T tuner chip (circa 2013) that can be used to collect raw IQ samples

There is a common DVB-T receiver chip capable of producing raw IQ samples, which makes it a good device for Amateur Radio SDR experimentation. The chips is used in some DVB-T USB dongles sold around 2012-2013. What is the model of that chip and…
jkj
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Are there major advantages to using DVB-S2 vs CCSDS (or vice-versa)?

In Cubesats, DVB-S2 and CCSDS are both equally present as communications standards. Are there really any pros and cons, that is - a "best choice for a given application", or are they just standards that have birthed and grown isolated from eachother…
Mister Mystère
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Is it at all possible to make a ham alert radio?

Would it be possible to make an alert radio... for shortwave? Out of something like Arduino, or RPi. Sort of like the NOAA Weather Radios. I got to thinking one day. Say you wanted to send a message to a far away friend, but you don't know if he's…
Joseph
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How can I know (check or detect or analyze) which modulation using of my remote control switch?

Please forgive me, my native language is not English. I'm new to radio, but I have several years of programming experience. I have a raspberry pi 4 model B (hereinafter referred to as pi), 433Mhz RF Wireless Receiver & Transmitter pair (about the…
huang
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