Search found 136 matches

by hotpaw2
Sun Aug 20, 2017 11:46 pm
Forum: RTL-SDR Discussion
Topic: Weird interference and reception
Replies: 2
Views: 3850

Re: Weird interference and reception

Hi there, I am very confused as to what's going on here, I have a ground plane antenna designed fr air band My current location picks up the police fine, but not the tower, if I lean the antenna back 10cm it pick's up tower but not police. Also getting some kind of interference any help would be ap...
by hotpaw2
Mon Aug 07, 2017 4:53 pm
Forum: RTL-SDR Discussion
Topic: raspberry pi 2 make a lot of noise
Replies: 4
Views: 5066

Re: raspberry pi 2 make a lot of noise

Hi I asked in an other Forum but there was no solution. The Pi make a lot of noise! :o I cant use the Dongle for reception its insane how noisy it get and its impossible to receive anything. The Pi is in a Metal Case. :roll: I put the RTL-SDR dongle on a USB extension cable (with ferrite beads on i...
by hotpaw2
Thu Jul 20, 2017 4:05 pm
Forum: User Projects
Topic: Demodulate FSK
Replies: 6
Views: 20548

Re: Demodulate FSK

If you want to do this in code (your own program), and you know the bit or baud timing plus the two FSK frequencies, then two running Goertzel filters will work. They are roughly equivalent to narrow band-pass filters. Just take the difference of the two Goertzel filters magnitude outputs and look f...
by hotpaw2
Thu Jul 13, 2017 3:58 pm
Forum: RTL-SDR Discussion
Topic: I will make a SDR Spectrum software.
Replies: 3
Views: 3326

Re: I will make a SDR Spectrum software.

I will make a SDR Spectrum software. I want to know that RTL2832 only send RAW DATA(RF-signal digitalised)???? hent I just get these raw Rf stream data from USB (Yes, I will install driver for linux of this chip) and Then do FFT to these stream, Then I will get spectrum. You have the basic idea. An...
by hotpaw2
Fri Jun 23, 2017 9:51 am
Forum: RTL-SDR Discussion
Topic: Not very successfull with SDR - Advice
Replies: 50
Views: 33303

Re: Not very successfull with SDR - Advice

If you haven't already, you might want to remove the Ham-it-up converter so you can debug each component (converter versus RTL-SDR) separately. After removing the converter, set the offset in your software to zero. I'm using a discone on a long coax, with no LNA, and can receive local aviation band ...
by hotpaw2
Wed Jun 21, 2017 6:25 pm
Forum: RTL-SDR Discussion
Topic: Not very successfull with SDR - Advice
Replies: 50
Views: 33303

Re: Not very successfull with SDR - Advice

An LNA won't help if the reason for lack of success is due to a high RF noise floor. An LNA (without an appropriate bandpass or notch filter) amplifies the noise just as much as the signal, so would be no help whatsoever if the problem is RF noise at the antenna. One solution might be to use, not an...
by hotpaw2
Tue Jun 20, 2017 3:11 pm
Forum: Troubleshooting Help
Topic: Problem with NOISE! FML
Replies: 4
Views: 4825

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: 5313

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: 6566

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: 7106

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...