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Questions tagged [sdr]

Software Defined Radio is a technology for doing radio signal synthesis and demodulation/analysis using software.

-2
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2answers
53 views

Is it possible to replicate a Novotron 522 remote control?

The signal I want to replicate is to open/close a garage door, operated by a Novoferm motor. The remote control used is a Novotron 522. The description states this is 2-channel remote control, ...
0
votes
0answers
42 views

What kind of Modulation? Who transmits on 850 MHz (LTE-Uplink or GPRS?)?

Hey, I found an interesting Signal on 850MHz (in Germany). It is not symmetric and very strong (relative to many others due to bad antennas). On the right side the bandwith is permanently used, on the ...
0
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0answers
28 views

Correct way to calibrate SDR RX into a measuring receiver

While playing with my SDR (Software Defined Radio) Board, I was interested in performing a TX output power table at different center frequencies and TX antenna gains. However, unfortunately, I do ...
1
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1answer
55 views

Correct way to compute the power of a pulsed signal

I'm developing an application with my SDR Board and I've managed to produce a calibration table to verify the output power of the transmitter for every TX configuration of antenna gain and IQ digital ...
0
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0answers
24 views

Output TX Power with complex impedances

I'm developing an application with my software defined radio (SDR) Board and it is very critical that I have some control over the actual power I am transmitting at every time. In order to do this, I ...
1
vote
1answer
90 views

SDR Signal Generator Frontend

I am working on a board that can take the output of an SDR (or VCO) and provide high accuracy amplitude control (+- 0.5dB). This is an opensource project that I will hopefully launch on crowdsupply ...
1
vote
2answers
64 views

Signal Strength to ADC quantisation levels

According to the excellent site of AB4OJ, the Icom 7300 in summary has a 14bit analogue to digital converter with a 1.5 volt peak to peak input (LTC2208-14). I make this to be 91.5uV per quantisation ...
0
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1answer
73 views

How can I measure my smartphone transmitted power? [closed]

I was wondering if I can measure my phone's transmitted power with an SDR by tunning in the transmission bandwidth but then, I'm not sure how to know whether this power is coming out of my phone or it'...
0
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1answer
43 views

Identification of line code from amplitude, phase and PSD plots

I recorded some transmitted data using the Noo-Elec RTL2832 software-defined radio. The data is transmitted at a carrier frequency of 1.3GHz and sampled at 2.4MHz. The transmitted data is a set of ...
0
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2answers
125 views

Measure transmission power of USRP [closed]

I am working with USRP(Universal Software Radio Peripheral) having power gain (mentioned in specifications) of 17dBm to 20dBm. I am using 3dbi omni-directional VERT900 antenna with it. I know the ...
1
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0answers
109 views

Help decoding line code

I have collected a burst signal from a radio device using an RTL-SDR and gnuradio and demodulated the FSK, but am having trouble deciphering what the line code is. Signal is at 151.3MHz Here is the ...
0
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0answers
42 views

Checking for signals above strength threshold over SDR on VHF

So I have a small NooElec Software Defined Radio and I've got it working well with my Raspberry Pi using GQRX as a controller and to visualize the SDR output. My goal though is to use a python script ...
2
votes
1answer
96 views

How to observe the signals of a radio remote control using CubicSDR?

I have to admit I'm a complete newbie with regards to radio frequencies and such ... :-( Thanks to this site I've been able to find out what transceiver is being used in the remote control I'm ...
0
votes
1answer
630 views

Interpreting IQ Data (as hex) from an RTL-SDR/Hack-RF

I am wondering if someone can shed some light on how to meaningfully interpret I/Q data that is produced from an RTl-SDR dongle (RTL2832U) using the Osmocom RTL-SDR library. I have used I/Q data ...
0
votes
1answer
99 views

Can we transmit a PSK modulated signal with YARD Stick One?

We are working on a project to produce a simple walkie talkie repeater. We have a RTL SDR, which we are using to reverse engineer our signal. Using this + URH, we think our signal is PSK modulated, ...
0
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1answer
198 views

What is the difference between IF data and IQ data? How we can read IF data in SDR? [closed]

How to read IF data in GNU SDR? As i had tried a lot to read IF data in SDR but it can be readable in MATLAB but not in SDR..
0
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0answers
202 views

Reading Radio Frequency signal in audacity

I am wanting to read radio signal I captured with my RTL-SLR, I record it in .wav file using SDR#, The Frequency was at 315MHz. I am what I believe is the preamble of the signal, and I would like ...
2
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0answers
175 views

ETSI EN 300 220-2 vs ERC 70-03 Limitations

I’m trying to understand discrepancies between EN 300 220 and ERC regarding the use of 865 - 868 MHz spectrum for SDR. Current ERC 70-03, page 8, says: Frequency Band: h1.2 Maximum Occupied ...
10
votes
1answer
2k views

What could this signal at 119.9 MHz be?

I had some fun with an RTL-SDR dongle, and I noticed this weird signal with no noticeable pattern at 119.9 MHz. What's even weirder is that the signal is symmetrical. What might this be? Or is ...
0
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0answers
103 views

15 GHz MW link signal strength monitoring

I would like to monitor the signal strength of 15 GHz microwave links using an SDRplay2 connected to a simple dish antenna. Max input frequency for the SDR is 2 GHz. However, most LNB's operate in the ...
-1
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3answers
696 views

Antenna preamplifier [closed]

I'm designing an antenna preamplifier for my SDR Receiver. I checked some designs online but I decided to set for simple transistors as I have no source for JFETs and battery powered to make it ...
2
votes
1answer
336 views

High precision distance between two GPS devices (may be GNSS-SDR)

I wish to get to high precision distance between 2 not moving points. e.g. 1 cm accuracy for distance 1 km I think if I will catch same GPS signal in two points then distance between resulting ...
20
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2answers
514 views

“56k modem” found in VHF band

While scanning the VHF spectrum with a SDR USB dongle, I found something that sounded like an old 56k modem (at around 160MHz, FM modulation, Europe region). After some research, I found out that is ...
1
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3answers
1k views

Where does SDR IQ data come from?

I have never really done much RF design before, and am looking into getting an SDR and messing around with it. I have been doing some research into how they work, and havr found that IQ modulation and ...
3
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0answers
148 views

bearing ambiguity resolve (direction finding) for multiple sources

I am working on wideband direction finding algorithms for passive sensors. I started with Music algorithm. For practical reasons, the spacing can not be maintained lambda/2. For greater antenna ...
2
votes
5answers
542 views

Software Defined Radio hardware

Most software defined radio peripherals involve a FPGA. In designing a SDR peripheral, I would like to know whether its possible to design a GNU Radio Compatible SDR hardware peripheral without any ...
1
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3answers
1k views

How to use the same antenna to receive and transmit on the same frequency with an SDR [Half-Duplex]?

Considering that the SDR board has one TX/RX output/input and one RX input, I am wondering how could I use one antenna for a half duplex communications on the same frequency. The idea is to use the ...
3
votes
2answers
534 views

SDR pcb design guide [closed]

I am searching for any type of guides for pcb design for SDR (software defined radio) application without luck. I am planning to design pcb board with Zynq-7000 and AD9364 onboard. Any recommendation ...
1
vote
1answer
158 views

Replacing 28.8Mhz TCO with up-converted GPSDO 10Mhz signal?

Would it be possible to design a circuit that could replace the TXCO (28.8Mhz) of a RTLSDR dongle by replacing it with a signal generated from a 10Mhz reference signal, coming from a GPSDO? And what ...
2
votes
2answers
1k views

Antenna for broadcast AM reception on ARM Radio SDR

I'm trying to build the ARM Radio project detailed here. I routed and fabricated a PCB for the anti-alias filter and preamplifier shown on page 2 of the linked PDF, and reproduced here: Unfortunately ...
6
votes
2answers
346 views

limit duration 1pps signal

As a beginner in electronics, I would appreciate very much to get some input from you folks for my project, so I can decide in what direction to point my nose :) What would I like to do? I would ...
3
votes
1answer
146 views

Can I implement a FM Radio Rx on the the Spartan 3E kit?

Can I implement a FM Radio Rx on the the Spartan 3E kit? Starting Problems I am facing- How do I interface the Antenna with the Spartan 3E kit? Implementing the A/D converter.
2
votes
1answer
610 views

Can I transmit in the ISM band without a ham radio license?

I recently purchased a HackRf SDR, which has transmit and recieve capability. I'm debugging a 2.4ghz wireless module, and being able to transmit to it using the hackrf would be very helpful. Since ...
1
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1answer
196 views

900 MHz I/Q Direct Conversion SDR

I am in the process of designing an SDR and have completed a block diagram of its architecture. Before proceeding with more thorough component identification, I was hoping to receive confirmation that ...
5
votes
2answers
3k views

What RF attentuator would be used for the HackRF?

Background info: The HackRF is an SDR Radio capable of receiving and transmitting frequencies from 10MHz to 6GHz. Michael Ossmann, the creator of the HackRF, states in his wiki that: The maximum ...
1
vote
1answer
152 views

Designing radios with gnuradio

I am looking at FM radio receiver designs others have created with gnuradio. There are a couple of signals questions I have after looking at these designs. The source (e.g. rtl-sdr) samples at a ...
1
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0answers
544 views

Does the rt2832u chip have enough bandwidth for ATSC?

I'd like to upgrade the audio/infotainment module in my 2009 Camry. I see several off the shelf solutions, but they don't have a builtin digital TV tuner and the processor isn't as fast as I'd like. ...
4
votes
2answers
1k views

How would I go about analyzing this SDR-captured 300 MHz radio signal?

I am attempting to reverse engineer the signal from a 300 MHz garage signal as a learning experience rather than an exercise in efficiency. My intent is to purchase a 300 MHz broadcaster IC and ...
1
vote
3answers
480 views

How to chose an IF, or how bad is zero-IF really?

In a superheterodyne receiver, what must one consider in order to chose an intermediate frequency? Specifically, I'm working on a radio telescope project. It is basically a superheterodyne receiver ...
5
votes
1answer
1k views

Designing an optimal BPSK and/or QPSK transciever in SDR

I'm currently working on writing firmware for the modem on a cube satellite for my university's satellite team. My primary goal is to implement the data uplink & downlink. The RF system, ...
2
votes
1answer
7k views

Determine the working frequency band of unknown RFID chip

I have a passive RFID chip from which I would like to scan the ID. I have a standard USB RFID Reader, but this doesnt print out anything. This reader scans the 120–150 kHz range, so the chip must use ...
5
votes
2answers
6k views

Bandwidth vs sample rate in SDR

In software defined radio (SDR) I often see sample rate and bandwidth interchanged or maybe I'm misunderstanding... If an sdr can sample a 2 MHz wide slice of rf spectrum does that imply it would be ...
0
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2answers
2k views

Calculation of output power of USRP

I am using USRP B210. (product page) I want to know the output transmitted power so that I could remain under FCC regulations.I am operating at a frequency of 2.4 GHz(ISM band of 2.4-2.4835GHz). In ...
1
vote
1answer
278 views

Is there a way to build a software defined radio using the PC's DSP chip? [closed]

I'm looking to build a radio controller for a few DIY robots and was wondering if anyone knew of a way to utilize the onboard DSP in PC's as a SDR. The reasoning for this direction is I remember ...
2
votes
2answers
2k views

USB power noise insulation (SDR-related)

I am working on a small board which would allow to connect RTL2832 SDR dongle & HF converter to a PC while using power from battery & separate linear regulators. The idea is to eliminate ...
9
votes
1answer
1k views

Impedance of differential inputs on AD converters

I'm currently trying to attach a rather fast ADC/DAC-converter chip to an FPGA to receive and transmit RF in the future, but getting the converter to run and attaching a signal generator and an ...
-3
votes
1answer
663 views

GNU Radio with USRP [closed]

I have a problem transmitting a voice file from GNU radio to USRP. My problem is the simulation was working fine but when I transmit data from GNU radio attached with USRP to its receiver only noise ...
6
votes
3answers
555 views

Is information lost when you downconvert an RF frequency?

I am trying to work out what happens when you downconvert an RF signal, such as what happens in an SDR device when tuning to a given frequency. For example if a device using a Zero-IF is tuned to ...
2
votes
3answers
3k views

How to reduce the clock jitter for an ADC?

I am building a SDR (Software defined radio) and I am trying to clock my 16 bit 130 MS/s ADC. At this speed, the jitter of the clock is very important and a bad jitter can reduce the SNR of my ADC a ...
4
votes
2answers
487 views

Safe to connect SDR to home Cable?

I have an SDR (RTL2832u) that connects to an antenna and can receive over the air just fine. I'm wondering if the signal of a home cable connection would be too strong to connect to the SDR input or ...