Questions tagged [software-defined-radio]
Radio devices that use digital signal processing in place of analog electronic components to manipulate RF signals.
19
questions
2
votes
2answers
3k views
No module named 'gnuradio'
I encountered with the "No module named 'gnuradio'" error while I was trying to run GnuRadio python code in my python web server.
And this is my gnuRadio generated code:
...
18
votes
3answers
4k views
SDR sampling bandwidth - do the bits per sample matter?
I'm looking at data converter chips for a homebrew SDR design, and I see that I can choose not just the sampling frequency, but also the bits per sample.
Obviously the sampling frequency has to be ...
3
votes
3answers
2k views
Broadband antenna for SDR radio
I recently bought a very wideband SDR receiver (DX-Patrol MK4, declared covered frequencies are 100kHz-2GHz). I'm experimenting with antenna designs because unfortunately I live in an apartment ...
10
votes
1answer
2k views
Why is dynamic range relevant for an SDR?
Sometimes I see dynamic range mentioned as a figure of merit for an SDR. For example, I know that the bits per sample used by the analog to digital converter can affect the dynamic range.
Why do I ...
2
votes
1answer
214 views
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 ...
12
votes
4answers
2k views
Is is possible to operate D-Star from a software-defined radio?
What is preventing a software-defined radio from transmitting the D-Star protocol?
10
votes
2answers
930 views
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 ...
6
votes
2answers
182 views
SSB offset determination?
Is there any algorithmic way to determine if the mixed frequency offset in an SSB SDR demodulator is wrong (too high or low), other than listening for funny sounding voices? (perhaps by checking to ...
3
votes
2answers
3k views
Choosing a wideband antenna design
On a previous question I asked about proper antenna design for wideband SDR receiver and ways to improve signal/noise ratio. Ideally the reciever has a range of 100kHz-2GHz. Keeping in mind is ...
10
votes
2answers
661 views
Can an amateur use cellular technologies with SDR?
Software Defined Radio is opening up many new possibilities for amateur digital modes. One family of technologies that interests me is cellular. 2G GSM voice/sms and 2.5G GPRS data has been proven to ...
7
votes
2answers
519 views
How to calculate if low-pass filtering is sufficient?
An answer on this question Suggested method for boosting 0.05 watt transmitter up to 10+ watts? suggests putting a filterless 19dB amplifier between the HackRF (or similar general-purpose SDR) and a ...
6
votes
1answer
1k views
Suggested method for boosting 0.05 watt transmitter up to 10+ watts?
Long time ham operator here, new to this particular challenge -
I have a software defined radio transceiver that I'd like to try and use to make contacts on HF, in particular 20-meters. Tuning ...
6
votes
4answers
380 views
How can quadrature mixing adjust the phase of all frequencies by the same amount? Can it be done in the digital domain?
This came up in some feedback I got when I tried to answer What is IQ in the context of SDRs? and revealed some of my own misunderstanding.
Initially, I gave an answer something like (paraphrasing):
...
4
votes
2answers
379 views
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 ...
5
votes
2answers
866 views
How does rpitx generate arbitrary SSB data with a clock peripheral?
While it wasn't the first to do so, the rpitx software seems to be the most active and mature implementation of what its own comments call "a code fragment by PE1NNZ". The trick is explained in Guido'...
4
votes
5answers
159 views
2
votes
1answer
333 views
Can HDSDR perform the work of Direwolf?
I have a setup in which Direwolf is used in conjunction with a Baofeng radio to basically send data (AFSK). My app connects to the TCP server provided by Direwolf, send him some data which then is ...
1
vote
2answers
2k views
How to best connect an FM transmitting GPIO pin to an antenna?
I'm trying to use a RaspberryPi3 as a FM transmitter, using pifm and/or PiFmRds to send audio in 88-108 MHz band. The RPi can then use the GPIO-4 pin to transmit between ...
0
votes
0answers
46 views
A gnuradio program that can output some arbitrary waveform read from a file containing I/Q values
I am trying to figure out how to create a gnuradio program that can output some arbitrary waveform read from a file containing I/Q values.
I would highly appreciate any guidance in this topic. Simple ...
