Search found 100 matches

by hotpaw2
Tue Jun 20, 2017 3:11 pm
Forum: Troubleshooting Help
Topic: Problem with NOISE! FML
Replies: 4
Views: 3846

Re: Problem with NOISE! FML

Are you comparing between receiving on Linux and Window on one system (dual boot, etc.), or between two different computers? Some systems can produce far more RF noise than others.
by hotpaw2
Wed Jun 14, 2017 3:47 pm
Forum: Off-Topic
Topic: short active usb cable
Replies: 3
Views: 4425

Re: short active usb cable

You have a bad USB cable. Maybe one meant for 5V power only. I have two on my RTL-SDRs on passive USB extension cables, with ferrite beads on the cables to help reduce USB RF noise a bit.
by hotpaw2
Mon Jun 12, 2017 3:51 pm
Forum: RTL-SDR Discussion
Topic: RTL-SDR Dongle
Replies: 7
Views: 5164

Re: RTL-SDR Dongle

The RTL-SDR dongles that work with Android phones (plus an OTG cable) can drain a mobile phone's battery in less than an hour. The E4000 dongles use less power, so possibly might allow some battery life. The only ways I've found to connect an RTL-SDR to a (stock iOS) iPhone is over a network plus us...
by hotpaw2
Mon Jun 12, 2017 3:38 pm
Forum: Troubleshooting Help
Topic: RTL SDR issues with Raspberry Pi; check RTL SDR working?
Replies: 7
Views: 5770

Re: RTL SDR issues with Raspberry Pi; check RTL SDR working?

Some RTL-SDR sticks run hotter than others. The sticks that run extra hot, I do not use with my Pi's, as they are possibly pulling too much current for the Pi power supply. I also use 2.5A or 3A Pi power supplies with hard-wired (not socketed) USB cables, plus heat sinks on top of my Pi chips. A sma...
by hotpaw2
Wed Jun 07, 2017 5:33 pm
Forum: RTL-SDR Discussion
Topic: How do I use RTL-TCP?
Replies: 10
Views: 17758

Re: How do I use RTL-TCP?

Hi, I'm able to perform this transfert throught rtl tcp, under windows :-( with this kind of commands : char buffer4[5]={0x03,0x00,0x00,0x00,0x01}; // 00 auto gain iResult = send( ConnectSocket, buffer4, 5, 0 ); if (iResult == SOCKET_ERROR) { printf("send failed: %d\n", WSAGetLastError()); closesoc...
by hotpaw2
Sun May 21, 2017 9:08 pm
Forum: Troubleshooting Help
Topic: How to get rid of this?
Replies: 2
Views: 3011

Re: How to get rid of this?

Those repeating patterns look like they might be harmonics produced by a digital square wave or spiking noise source. Possible RF digital noise sources might include your PC, Pi or laptop, monitor, the PC's power supply, wifi or other router, cable or DSL modem, cell phone, bluetooth wearables, flou...
by hotpaw2
Fri May 19, 2017 5:24 pm
Forum: Troubleshooting Help
Topic: usb_claim, any permanent solution?
Replies: 2
Views: 2993

Re: usb_claim, any permanent solution?

modernhistorian wrote: When I run the piaware image on a card in the Pi3, and same stick, I do not have this problem.
Have you compared all the entries in /etc/modprobe.d/ to see if any are missing on your Raspian card that are on the piaware card?
by hotpaw2
Sat May 13, 2017 6:56 pm
Forum: RTL-SDR Discussion
Topic: Multiple FM station recording RTL-SDR Dongles + Raspberry pi
Replies: 5
Views: 4634

Re: Multiple FM station recording RTL-SDR Dongles + Raspberr

How many FM stations do you want to record? You might want to consider more than one Raspberry Pi (e.g. one or two RTL-SDR USB sticks per Pi), as each Pi can only supply limited power and bandwidth over the shared USB hub.
by hotpaw2
Sat May 06, 2017 6:47 pm
Forum: RTL-SDR Discussion
Topic: C++ and RTL SDR RT820T2
Replies: 5
Views: 6043

Re: C++ and RTL SDR RT820T2

I wanted to write some basic SDR DSP code in C and in Swift, and without worrying about USB drivers, hardware chip register settings, and such. So I just installed and ran the rtl_tcp utility. The rtl_tcp utility is included as part of various RTL-SDR software distributions (on github, etc.), with p...
by hotpaw2
Sat Apr 08, 2017 6:25 pm
Forum: Troubleshooting Help
Topic: IP Address Format & Source
Replies: 4
Views: 4174

Re: IP Address Format & Source

Is the RTL-SDR plugged into your PC's USB port?

Are you trying to connect from your Android phone to a server on your PC?

Is your PC running a firewall?