Search found 94 matches

by hotpaw2
Mon Aug 12, 2019 2:20 pm
Forum: Other SDR Devices
Topic: Any good full-duplex SDRs?
Replies: 8
Views: 598

Re: Any good full-duplex SDRs?

Has anyone here tried an Afedri SDR?
Looks interesting. Appears to be full-duplex. Direct Sampling. Comes with Ethernet support built-in.
http://www.afedri-sdr.com/index.php/ord ... nformation
Ships from Israel?
by hotpaw2
Sat Aug 10, 2019 6:06 am
Forum: Other SDR Devices
Topic: Any good full-duplex SDRs?
Replies: 8
Views: 598

Re: Any good full-duplex SDRs?

The LimeSDR Mini is available from the CrowdSupply online store: https://www.crowdsupply.com/lime-micro/limesdr-mini I had no problems ordering one, just like from any other online store. The unit arrived about a week after ordering, and worked right out of the box. The LimeSuite software library fo...
by hotpaw2
Fri Aug 02, 2019 10:09 pm
Forum: User Projects
Topic: I need some advice in creating IQ processing software
Replies: 5
Views: 429

Re: I need some advice in creating IQ processing software

A few million IQ samples per second isn't really fast on any modern CPU (including those on mobile devices and Raspberry Pi's) which can perform Billions of floating point operations per second. You may have to use a moderately optimized FFT library, but there are many libraries (other than FFTW) av...
by hotpaw2
Fri Jul 19, 2019 2:36 pm
Forum: RTL-SDR Discussion
Topic: Data buffering of rtl
Replies: 3
Views: 413

Re: Data buffering of rtl

Even a Raspberry Pi 3 running rtl_tcp doesn't buffer 5 seconds of data on a fast network. Depending on the sample rate, maybe 1 second or less, mostly from the USB transfer bursts. The SDR software maybe needs to buffer another half second, depending mostly on network and OS latency jitter. Audio ou...
by hotpaw2
Mon Jul 15, 2019 4:56 pm
Forum: Off-Topic
Topic: What (besides sw compatibility) is needed for SDR?
Replies: 2
Views: 433

Re: What (besides sw compatibility) is needed for SDR?

USB hardware devices are allowed by the USB spec to have completely different profiles. Just because the connector looks the same does not mean that the profile supported is the same. A USB flash drive is quite different from a USB audiophile DAC. Different USB profiles. And you can only communicate...
by hotpaw2
Sun Jul 14, 2019 4:12 pm
Forum: Other SDR Devices
Topic: SDR radio kits to assemble?
Replies: 2
Views: 408

SDR radio kits to assemble?

Are there any electronics kits available, requiring assembly from schematics, PCB(s) and components, for SDR experimentation? Or do all the surface-mount components required make this too difficult?
by hotpaw2
Mon Jul 01, 2019 4:26 pm
Forum: Troubleshooting Help
Topic: Spikes on HF frequency
Replies: 6
Views: 680

Re: Spikes on HF frequency

Those periodic spikes and waves look like the symptoms of electronic switching RF noise. This kind of RF noise can be generated by LED lights, power supplies, network equipment (cable modem, WiFi/ethernet hubs, etc.), PCs, monitors, printers, and etc. Not only in your place, but from inside any near...
by hotpaw2
Mon Jul 01, 2019 12:38 am
Forum: Troubleshooting Help
Topic: Has anyone managed to get a Raspberry Pi 4 working with an RTL SDR?
Replies: 8
Views: 1168

Re: Has anyone managed to get a Raspberry Pi 4 working with an RTL SDR?

A bunch of us are probably still waiting for more Pi 4's to be in stock and ship.
by hotpaw2
Tue May 28, 2019 1:06 pm
Forum: RTL-SDR Discussion
Topic: Using SDR and computer to send data over internet
Replies: 3
Views: 728

Re: Using SDR and computer to send data over internet

Whether possible depends on the protocol used by the 900 MHz radios (e.g. any message response latency requirements, etc.). If possible, it would require some full duplex SDR radios, such as the Hack RF, LimeSDR, Ettus Research, and etc. which are more expensive than RTL-SDR plug-ins.
by hotpaw2
Fri May 24, 2019 6:59 am
Forum: RTL-SDR Discussion
Topic: Sigmira: Sr. Citizen Woes
Replies: 4
Views: 717

Re: Sigmira: Sr. Citizen Woes

Why not ask the sigmira developer? Probably knows a lot more than anyone here.