Search found 20 matches

by Ben321
Sat Feb 16, 2019 6:27 am
Forum: Other SDR Devices
Topic: Check out the specs on THESE receivers!
Replies: 2
Views: 4850

Check out the specs on THESE receivers!

I don't know how much is software controlled, versus controlled from the front panels of the devices, but the specs are BEYOND AWESOME! https://www.rohde-schwarz.com/us/products/aerospace-defense-security/receivers/pg_overview_63723.html They have a handheld receiver that goes from 9kHz to 7.5GHz. T...
by Ben321
Fri Feb 15, 2019 1:30 am
Forum: User Projects
Topic: How exactly are the IQ channels supposed to be calculated/processed?
Replies: 2
Views: 6436

How exactly are the IQ channels supposed to be calculated/processed?

I had assumed that it worked like this. A radio signal from the antenna if split into identical copies. One is then multiplied by a Cosine wave, and is called the I signal. The other is multiplied by a Sine wave, and is called the Q signal. The 2 sinusoidal waves are described by the equations Cos(2...
by Ben321
Sun Mar 05, 2017 10:16 pm
Forum: RTL-SDR Discussion
Topic: SDR# scanner plugin creation request
Replies: 3
Views: 2643

Re: SDR# scanner plugin creation request

rtlsdrblog wrote:Are you sure frequency manager suite can't already do this? http://www.freqmgrsuite.com

I believe you just need to add your favorite frequencies to a group, then you can scan that group only.
Can it actually scan the group?
by Ben321
Sun Mar 05, 2017 9:29 pm
Forum: RTL-SDR Discussion
Topic: How do I use RTL-TCP?
Replies: 10
Views: 17023

How do I use RTL-TCP?

I'm running RTL-TCP.exe on my computer (which is a server program that allows other programs to get raw IQ data and send control commands, all via TCP), and am writing a TCP client program to communicate with it. It's MUCH easier to write a program that deals with networking (via MS Winsock in Windo...
by Ben321
Sun Mar 05, 2017 8:12 am
Forum: RTL-SDR Discussion
Topic: SDR# scanner plugin creation request
Replies: 3
Views: 2643

SDR# scanner plugin creation request

In light of the fact that all available scanner plugins for SDR# are missing what I consider an important feature, I'm putting out this request to any/all programmers here who have knowledge of how to create SDR# plugins. Here's the problem, all scanner plugins currently work by scanning through a r...
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: 5440

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: 4332

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: 4332

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: 5440

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: 3440

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...