Questions tagged [software-defined-radio]
Radio devices that use digital signal processing in place of analog electronic components to manipulate RF signals.
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Building a Distributed Wideband (1-18 GHz) Receiving System for Electromagnetic Environment Reconstruction [closed]
I'm working on a project to build a distributed wideband receiving system that can reconstruct the electromagnetic environment over a wide frequency range (1-18 GHz).
The goal is to detect, ...
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Meteor scattering with RTL-SDR RTL2832U
What type of antenna and frequency is best for meteor scattering?
I have a RTL-SDR RTL2832U DVB-T tuner dongle and would like to learn how to use it.
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Budget Open Source and Open Hardware SDRs?
Recently, I've been playing with an RLT-SDR dongle and enjoying it. While I've designed plenty of PCBs and other electronics, I haven't had a chance to work with RF at all, so I wanted to design my ...
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Printing the Signal Power on the terminal from the USRP source block on GNURadio
I'm working on a project that makes use of the Ettus USRP X300 and the GNURadio environment. I have established a connection between the transmitter and the receiver of the USRP and I'm able to read ...
2
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1
answer
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What is this weird interference/strange radio station?
When I was checking if my antenna is working properly using websdr.org, I came upon this: On 4480 kHz, there are some strange noises. You can also see it in the waterfall here. Is it just some ...
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Tuning an L-band dish for receiving GOES signals
I've encountered some challenges with my ground station intended for receiving images from GOES satellites, and I'm seeking your expertise to troubleshoot the issue. Here are the system specifications:...
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Getting RSSI values between two B210 USRP to print on a text file [closed]
I have been using Gnuradio for a while and wanted to print the RSSI values to a text file as received from the other USRP. My objective is to print RSSI values from one transmitting USRP to another ...
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data rate for dsss in amateur radio
I have a question about the data rate for a DSSS transmission in amateur radio. I give an example with a bandwidth $B=4$ kHz, a spreading factor $SF=64$, a DQPSK modulation and a convolutive code with ...
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Excessive frequency deviation for DMR handsets?
A Hytera DMR handset that I am working with has a frequency deviation of 2300-2700 Hz. This is higher than the expected 1944.0 Hz frequency deviation specified in the DMR specification (ETSI TS 102 ...
- 141
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Receiving a lot of noise with RTL-SDR and SDR# for GOMX-1
Hi im new to SDR and having issues setting up SDR#. I'm trying to receive from GOMX-1 on 437.25 MHz for a project. My set up is the dongle, a LNA and a self built helical antenna for that frequency's ...
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Building a bat detector using an SDR USB dongle - is it possible?
I'm currently trying to find a way to build a bat detector on a budget (good commercial ones are ridiculously expensive), and came across this video building one using SDR:
https://www.youtube.com/...
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What band/setting is suitable for using SDR in wild area for exchanging beacon messages and alerts? [closed]
The problem we try to fix:
We're living in north America. In many wild areas, mostly hilly forest terrain, there's no cellular signal. So far we figured out two solutions: using two-way radio (walkie-...
1
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1
answer
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How to wire simple homemade long antenna for 100KHz+ on RTL-SDR
I have a rather beginner question, hope that's okay.
I use my Quansheng to listen over 50 MHz, and I have heard that one can hack the firmware to go down to 18 MHz, but I really want to listen to the ...
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Possible reasons why I only receive FM broadcast via SDR
My setup is the following:
terratec SDR dongle directly plugged into my laptop
the dongle shows up in gqrx as Realtek RTL2838UHIDH
coax cable out to the balcony, not laid in any loops
via an adapter, ...
- 163
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PPM modulation and demodulation
What is the procedure for modulating and demodulating the PPM signal in the samples received by SDR? The samples are in IQ format.
I want to play with the ADS-B system in Python (on the desktop of ...
