Search found 113 matches

by hotpaw2
Tue Jan 14, 2020 11:39 pm
Forum: RTL-SDR Discussion
Topic: USB ports and sdr....
Replies: 4
Views: 275

Re: USB ports and sdr....

I use a short high quality USB extension cable on which I clamp a ferrite bead or even use a few turns thru a ferrite toroid. This not only reduces stress on the USB connectors, but potentially also reduces the chances of computer RF noise traveling on the USB cable to the SDR.
by hotpaw2
Sun Jan 12, 2020 5:10 pm
Forum: RTL-SDR Discussion
Topic: Newby-Question about the computer.
Replies: 7
Views: 296

Re: Newby-Question about the computer.

You can also install rtl_tcp on your Mac, and use the rtl_tcp server with a couple different iOS apps to connect to your RTL-SDR from an iPhone or iPad. Installation instructions here: https://inst.eecs.berkeley.edu/~ee123/fa12/rtl_sdr.html For HF DX work, I might also recommend the Airspy HF+ Disco...
by hotpaw2
Wed Jan 01, 2020 6:24 pm
Forum: Troubleshooting Help
Topic: How to get started on R Pi buster?
Replies: 5
Views: 445

Re: How to get started on R Pi buster?

If you have an iOS or Android mobile phone or tablet, there are multiple apps available that allow you to stream signals from a Raspberry Pi running rtl_tcp on the Pi, to the app on your handheld.
by hotpaw2
Sat Dec 28, 2019 9:07 pm
Forum: Troubleshooting Help
Topic: How to get started on R Pi buster?
Replies: 5
Views: 445

Re: How to get started on R Pi buster?

There are some instructions on how to install rtl_sdr and rtl_tcp on a Raspberry Pi and various other systems here: http://www.transitiontechnologyventures.com/sdr-receiver/instructions You may or may not need to install libusb first, via: sudo apt-get install libusb-1.0-0-dev rtl_tcp allows one to ...
by hotpaw2
Tue Dec 03, 2019 6:10 pm
Forum: Other SDR Devices
Topic: Airspy HF+ Discovery
Replies: 16
Views: 3016

Re: Airspy HF+ Discovery

Does the Airspy HF+ Discovery have an internal Amp? Yes. I got a Airspy HF+ Discovery a few months back. For MF and HF, it works with a small loop of wire, even with just a dozen turns of wire around a ferrite rod. So it must have a pretty decent internal RF amplifier. I'm using it to stream IQ sam...
by hotpaw2
Tue Nov 26, 2019 4:23 pm
Forum: Other SDR Devices
Topic: Airspy HF+ Discovery
Replies: 16
Views: 3016

Re: Airspy HF+ Discovery

Spyverter is an upconverter, not needed with the Airspy HF+ or HF Discovery, but perhaps useful for an RTL-SDR.
by hotpaw2
Tue Nov 26, 2019 4:14 pm
Forum: RTL-SDR Discussion
Topic: RTL-SDR as a rf analyzer?
Replies: 6
Views: 596

Re: RTL-SDR as a rf analyzer?

For 60 dB or more attenuation, try transmitting into a small 50 Ohm dummy load (with the required power rating). Put another small dummy load at the end of a coax plugged into your SDR. Then experiment with how close or far apart the 2 dummy loads can be placed while still delivering sufficient powe...
by hotpaw2
Sat Nov 16, 2019 5:44 pm
Forum: Other SDR Devices
Topic: SDRplay announces the RSPdx
Replies: 8
Views: 1385

Re: SDRplay announces the RSPdx

Someone wrote: "I also compared SDRPlay with RTLSDRv3 and I didn't find any advantage of SDRPlay. " Was that comparison done for HF? And, if so, was the RTLSDRv3 in Direct Sampling mode or using an up-converter. In my experience, the Direct Sampling mode of my RTLSDRv3 unit seemed quite deaf on MF a...
by hotpaw2
Sun Nov 10, 2019 6:17 am
Forum: RTL-SDR Discussion
Topic: Long USB-cable vs long antenna-cable?
Replies: 23
Views: 35007

Re: Long USB-cable vs long antenna-cable?

Don't forget that each USB hub, and its power supply, is likely an RF noise source. That can add up to a lot of ferrite toroids and beads. Or course ethernet switches and Raspberry Pi's are also RF noisy. So, like you said, it's a trade-off.
by hotpaw2
Sat Nov 09, 2019 7:03 pm
Forum: RTL-SDR Discussion
Topic: Understanding buffer size of the TCP server inside RTL-SDR
Replies: 1
Views: 298

Re: Understanding buffer size of the TCP server inside RTL-SDR

Reading from a network buffer 1 byte at a time is very inefficient and unlikely to be able keep up with the high SDR raw IQ data rates. You should instead try to read at least MTU sized buffers or larger, and check the amount actually returned by the network read() call. The RTL-SDR chip provides bl...