Search found 127 matches

by hotpaw2
Thu Mar 09, 2017 1:27 am
Forum: Troubleshooting Help
Topic: rtl-sdr/tcp
Replies: 6
Views: 9489

Re: rtl-sdr/tcp

That error message might imply that you have a firewall enabled on the computer running rtl_tcp. You might want to look up the command to turn off the firewall for port 1234 (or whatever port you are using). One huge reason to use rtl_tcp is that opening a network socket may be far simpler than tryi...
by hotpaw2
Wed Mar 08, 2017 6:21 pm
Forum: RTL-SDR Discussion
Topic: Why does LTE use so much bandwidth?
Replies: 4
Views: 4128

Re: Why does LTE use so much bandwidth?

IIRC, LTE uses a variation of OFDM, which is the equivalent of splitting up and spreading the data out over many many channels simultaneously. That provides both bandwidth and resistance to interference and multi-path nulls, and might be easier to demodulate if have a chip that can do tons of very f...
by hotpaw2
Wed Mar 08, 2017 5:48 pm
Forum: RTL-SDR Discussion
Topic: How do I use RTL-TCP?
Replies: 10
Views: 19663

Re: How do I use RTL-TCP?

Basic use of the rtl_tcp protocol is extremely simple. Open a generic bidirectional TCP socket (default port 1234). Uplink control is by sending 5 byte units, 1 byte command, 4 bytes of data (32 bit integer in little-endian format). You can get by with as few as 4 or 5 commands. Here are a few of th...
by hotpaw2
Wed Mar 08, 2017 5:34 pm
Forum: RTL-SDR Discussion
Topic: Replace vehicle radio with rPi and RTL-SDR?
Replies: 3
Views: 3519

Re: Replace vehicle radio with rPi and RTL-SDR?

A vehicle radio has lots of front-end filtering (band-pass for the broadcast spectrum of interest) and shielding (from vehicle generated RFI and power-bus noise). Adding all that to a rPi + RTL-SDR would likely be required to get a decent signal. A cheap FM tuner hat for the rPI might be another pot...
by hotpaw2
Wed Mar 08, 2017 5:19 pm
Forum: Other SDR Devices
Topic: anyone done a comparison with the flights aware pro stick?
Replies: 2
Views: 3902

Re: anyone done a comparison with the flights aware pro stic

I have one of each. The FlightAware USB dongles have a front-end RF amplifier (LNA) built-in, which increases their sensitivity (thus range), but also how easily they can get overloaded by any other nearby RF signals. I can see that in some of my waterfall plots. So it's recommended that you use the...
by hotpaw2
Wed Jan 18, 2017 9:08 pm
Forum: RTL-SDR Discussion
Topic: Running a dongle on a networked PC ?
Replies: 13
Views: 10705

Re: Running a dongle on a networked PC ?

For my iOS devices, nothing else was available, so I've coded my own SDR software completely in Swift 3, including all the filters, some demodulators for AM and FM, and some spectrum viewers. Nice any plans to put your app on the iOS store? I've been working with at least one other developer who is...
by hotpaw2
Mon Jan 16, 2017 4:42 am
Forum: RTL-SDR Discussion
Topic: Running a dongle on a networked PC ?
Replies: 13
Views: 10705

Re: Running a dongle on a networked PC ?

For my networked personal computer, I'm running a Raspberry Pi 3 with an RTL-SDR V.3 dongle. The Pi is near my antenna, and streaming IQ data using rtl_tcp over WiFi to my Mac and iPad down at the other end of the house. Depending on WiFi interference in the neighborhood (quite a lot), the signal do...