Search found 2281 matches

by rtlsdrblog
Wed Jan 14, 2015 10:43 pm
Forum: Troubleshooting Help
Topic: Locks up after a few seconds
Replies: 14
Views: 16531

Re: Locks up after a few seconds

You can check the PPM by tuning to a known narrowband signal, e.g ATIS. You'll notice that the signal is probably not centred. To fix this adjust the PPM offset setting in the configure menu in SDR# (the cog icon) until the signal is centred. I mentioned PPM because I remember one case where a dongl...
by rtlsdrblog
Wed Jan 14, 2015 10:33 pm
Forum: RTL-SDR Discussion
Topic: sdrx1 from watson
Replies: 4
Views: 9703

Re: sdrx1 from watson

Is that the exact error you get? Don't think i've seen a message "sdr not working" before, is that in SDR#? I'm not sure what could cause that problem, perhaps Windows is automatically replacing the SDR driver with DVB-T ones. Try disabling automatic driver updates: http://www.sevenforums.com/tutori...
by rtlsdrblog
Mon Jan 12, 2015 11:09 pm
Forum: Signal Identification Help
Topic: [FRANCE] [78.800MHz] [DSB] Help Signal Identification.
Replies: 2
Views: 9186

Re: [FRANCE] [78.800MHz] [DSB] Help Signal Identification.

Sounds like noisy MotoTRBO/DMR. When posting an image I suggest you increase the FFT display resolution to at least 16k.

http://www.sigidwiki.com/wiki/MotoTRBO
by rtlsdrblog
Mon Jan 12, 2015 4:11 am
Forum: RTL-SDR Discussion
Topic: Novice questions re my new 100Hz-1.7Ghz SDR
Replies: 3
Views: 5930

Re: Novice questions re my new 100Hz-1.7Ghz SDR

I don't know what would be better, but first, i'd try to just receive AM broadcast using the speaker wire thrown around the room. Then you can improve things with the coax and guttering. Add in a 9:1 unun and grounding of the shield if possible. Also, since you're connecting it up outside be wary of...
by rtlsdrblog
Mon Jan 12, 2015 3:53 am
Forum: RTL-SDR Discussion
Topic: Phased array FM receiver
Replies: 1
Views: 5010

Re: Phased array FM receiver

This is a bit outside my knowledge, but I believe what you are trying to do is similar to radio direction finding with multiple antennas. Balint has done something like this, see his presentation at http://gnuradio.squarespace.com/storage/grcon12/seeber-DirectionFinding.pdf. You might like to also a...
by rtlsdrblog
Mon Jan 12, 2015 3:35 am
Forum: RTL-SDR Discussion
Topic: Novice questions re my new 100Hz-1.7Ghz SDR
Replies: 3
Views: 5930

Re: Novice questions re my new 100Hz-1.7Ghz SDR

Hi i'll try and answer some of your questions. 1) You're right that you can't compare a cheap SDR to an expensive scanner, but you should be able to get decent reception out of the SDR with some help from the DSP settings in SDR#. The RTL-SDR is limited by its 8-bit ADC and lack of preselection filt...
by rtlsdrblog
Sun Jan 11, 2015 10:31 pm
Forum: Troubleshooting Help
Topic: New to SDR
Replies: 1
Views: 3943

Re: New to SDR

Did you try some of the steps in the Quickstart guide troubleshooting section? http://www.rtl-sdr.com/rtl-sdr-quick-start-guide/ This is a common but difficult error to diagnose, usually having something to do with a driver issue. Can you try disabling windows automatic driver updates and re-running...
by rtlsdrblog
Sun Jan 11, 2015 10:28 pm
Forum: Troubleshooting Help
Topic: Locks up after a few seconds
Replies: 14
Views: 16531

Re: Locks up after a few seconds

What type of dongle are you using (eg model, package)? It sounds like a USB problem, possibly with the dongles themselves. Something is causing the USB to glitch causing a disconnect.

What is the PPM offset on both dongles?
by rtlsdrblog
Fri Jan 09, 2015 5:35 am
Forum: Troubleshooting Help
Topic: [newbie]osmsdr vs rtlsdr
Replies: 1
Views: 3901

Re: [newbie]osmsdr vs rtlsdr

osmoSDR is a project the Osmocom people were doing to make their own SDR.

RTLSDR is using a dvb-t dongle with the RTL2832U chip to get SDR capabilities.

While developing their SDR, the Osmocom team helped to discover the SDR capabilities of the RTL2832U.
by rtlsdrblog
Fri Jan 09, 2015 5:29 am
Forum: Troubleshooting Help
Topic: Locks up after a few seconds
Replies: 14
Views: 16531

Re: Locks up after a few seconds

Sometimes bad USB connections can cause the dongle to lock up. But if you've tried it on multiple PCs then I would be inclined to think that something is wrong with the dongles themselves, though it is unlikely for two to have the same problem. Are you perhaps tuning to unsupported frequencies below...