Search found 33 matches

by Ben321
Fri Feb 24, 2017 5:35 am
Forum: RTL-SDR Discussion
Topic: Question about I/Q RF signal from SDR software
Replies: 5
Views: 6655

Re: Question about I/Q RF signal from SDR software

I think its a good idea to review some text on how IQ works and why its needed in the first place. Basically without both the I&Q the baseband cannot be reconstructed. This is a really good video: https://www.youtube.com/watch?v=h_7d-m1ehoY If you want code some old SDR# code is available for learn...
by Ben321
Tue Feb 21, 2017 1:08 pm
Forum: Signal Identification Help
Topic: What radio band is this?
Replies: 4
Views: 5462

Re: What radio band is this?

Most countries usually publish their frequency licences in a database online, so if you search that database you should be able to determine what company that band is licenced to. From the screenshot and freq range, i'd guess that its P25 or DMR radios. Yes those constant lines are probably interfe...
by Ben321
Mon Feb 20, 2017 10:03 pm
Forum: Signal Identification Help
Topic: What radio band is this?
Replies: 4
Views: 5462

What radio band is this?

There's a lot of quite strong signals here, that I'm receiving with my RTL-SDR dongle. In addition to relatively weak, regularly spaced, constant (not modulated) carrier waves (which I suspect may be either electronic interference, or even signals generated by the dongle's own operation), there are ...
by Ben321
Sun Feb 19, 2017 10:59 am
Forum: RTL-SDR Discussion
Topic: Question about I/Q RF signal from SDR software
Replies: 5
Views: 6655

Re: Question about I/Q RF signal from SDR software

I'm not sure what you're asking. Are you meaning that you want to reconstruct the baseband from the I/Q? Exactly. The spectrum graph in HDSDR and SDR#, both show the full 2.4MHz wide spectrum in the software itself, but neither can save the full spectrum signal to a single-channel wav file (a featu...
by Ben321
Sun Feb 19, 2017 10:48 am
Forum: RTL-SDR Discussion
Topic: Why does LTE use so much bandwidth?
Replies: 4
Views: 4471

Re: Why does LTE use so much bandwidth?

Well i'm not sure exactly what you're asking for, but simply put: data can be transferred at a faster rate with a wider bandwidth. Think of it like using a fat hose vs a straw. I was wondering if somehow LTE required a wider spectrum, as an inherent part of the protocol, like FHSS (frequency hoppin...
by Ben321
Sun Feb 19, 2017 5:44 am
Forum: RTL-SDR Discussion
Topic: Why does LTE use so much bandwidth?
Replies: 4
Views: 4471

Why does LTE use so much bandwidth?

I was just looking at this page http://www.shawngarringer.org/2014/01/05/identification-of-cdma2000-gsm-and-lte-signals-with-sdr-and-rtl-sdr/ for how to identify cellphone tower signals for the 3 major technologies used now (CDMA2000, GSM, and LTE). GSM towers use a relatively small bandwidth. CDMA2...
by Ben321
Sun Feb 19, 2017 5:40 am
Forum: RTL-SDR Discussion
Topic: Question about I/Q RF signal from SDR software
Replies: 5
Views: 6655

Re: Question about I/Q RF signal from SDR software

Does nobody know how to do this? This thread has 21 views, and not even one reply (not counting the one I've made here).
by Ben321
Fri Feb 17, 2017 11:24 pm
Forum: Signal Identification Help
Topic: 433MHz signal BLASTING all over
Replies: 2
Views: 8755

Re: 433MHz signal BLASTING all over

So basically, you accidentally built your own radio jammer, and jammed your own receivers.
by Ben321
Thu Feb 16, 2017 11:21 pm
Forum: RTL-SDR Discussion
Topic: Question about SDR# configuration
Replies: 6
Views: 5228

Re: Question about SDR# configuration

You then can use HDSDR . it 's far better in everything. SDR# can do some things that HDSDR can't: SDR# can tune to anything that the SDR hardware plugged into your PC can handle. Meanwhile, HDSDR can't tune above 2147.483647MHz, even on RTL-SDR dongles that support it (those that have an E4000 tun...
by Ben321
Thu Feb 16, 2017 10:34 pm
Forum: RTL-SDR Discussion
Topic: Question about SDR# configuration
Replies: 6
Views: 5228

Re: Question about SDR# configuration

rtlsdrblog wrote:I see an option in that plugin "Auto update radio settings", that's probably the setting that you want to turn off.
Thanks. That worked.