Search found 33 matches

by Ben321
Fri Jul 26, 2019 7:31 pm
Forum: Troubleshooting Help
Topic: What is this wideband signal at exactly 432MHz?
Replies: 5
Views: 1444

Re: What is this wideband signal at exactly 432MHz?

Where are you from? And it look like Noise for me. I live in Seattle, WA. I thought that maybe since it had a carrier at a very specific frequency (exactly 432MHz), and also is extremely stable (no jitter in the carrier frequency at all), that maybe it was some kind of GPS calibrated transmitter. A...
by Ben321
Fri Jul 26, 2019 9:35 am
Forum: Troubleshooting Help
Topic: What is this wideband signal at exactly 432MHz?
Replies: 5
Views: 1444

What is this wideband signal at exactly 432MHz?

It's a little over 1 MHz wide and appears to use AM as its modulation, and it appears to have either 2 or 3 subcarriers. If 3 subcarriers, they appear to be using FM modulation, with the lower 2 having a wider bandwidth than the highest one. If 2 subcarriers, the lower one appears to be FSK modulate...
by Ben321
Fri Jul 26, 2019 6:07 am
Forum: User Projects
Topic: I need some advice in creating IQ processing software
Replies: 5
Views: 1508

I need some advice in creating IQ processing software

I'm trying to create software that can process the live IQ stream from an RTL SDR receiver. Problem is, these stream data at a rate of 2.4 MILLION samples per second. That's VERY fast. In fact, it's 50 times the speed of a normal sound card with a SR of 48000 smp/sec. This means every imaginable opt...
by Ben321
Sat Feb 16, 2019 6:27 am
Forum: Other SDR Devices
Topic: Check out the specs on THESE receivers!
Replies: 2
Views: 5823

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: 7011

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: 2992

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: 18494

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: 2992

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: 5926

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: 4739

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...