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RTL-SDR Discussion • Re: Driver patch for FC0013 to improve ADS-B

The way I understand it is that such patches may or may not be incorporated into one of the RTL DLLs available.
What you need to ask is "Has it been incorporated? Which one?"
Alan

Statistics: Posted by alanzfq — Fri Jul 03, 2020 7:07 am


Other SDR Devices • Re: SPECTRAN V6 with 245MHz IQ streaming via USB?

Ah, so they combine two USB ports. Got it, thanks a lot for that hint.

Just found a price of 3500 Euros at https://en.wikipedia.org/wiki/List_of_s ... ned_radios but i have no idea if this is the fully loaded version, I dont think so. I would guess it is the RSA 250X so limited to 80MHz RTBW.

Statistics: Posted by SDR-Marx — Thu Jul 02, 2020 2:47 pm


KerberosSDR • Kerberos SDR stopped responding

Hi,
I have been using steadily a kerberos SDR to track VHF signals using Raspberry Pi 4 powered with batteries.
The system was working fine.
Few week ago it just stopped responding. The software is initiating but when i hit start, nothing happens. no refresh rate or anything. I replace the kerberos with a second one (attached on the same antena array, raspberry Pi, power supply etc.) and it seems to work just fine. I was wondering whether this kind of behaviour makes sense, if its a malfuction and if i can do somehting to make it work again.

Statistics: Posted by Szotos — Thu Jul 02, 2020 2:24 pm


Other SDR Devices • Re: SPECTRAN V6 with 245MHz IQ streaming via USB?

SDR-Marx wrote:
Thu Jul 02, 2020 7:40 am
I just found this new USB SDR from Aaronia: https://aaronia.com/downloads/#tab_4

How can they stream 245MHz IQ via USB? I dont get it.

Whats the price tag?
Dual USB3.2 gives you 2x2x10Gibit/s raw bandwidth to play with (assuming they use lane bonding), and streaming 2x16bitx245MHz "only" needs 7.3Gibit/s (one channel, they offer up to 2xRX / 1xTX). Protocol overhead removed two RX channels at the maximum rate pretty much max out the usable bandwidth across the two USB3.2 connections if no lane bonding was used, so for accomodating the TX simlutaneously you need that at least on one of the two interfaces. Of course that doesn't help at all unless the host end can keep up with those kind of data rates, so the two USB endpoints likely need to terminate directly in the CPU/chipset that should then also have a few more lanes to spare for storage / networking.

As for the price, their shop says "on request", which usually is code for "if you have to ask you can't afford it". Based on the technical data I'd guess it starts somewhere in the low-mid five-digit € range, but you can probably fly past the six-digit thereshold when you max out all options.

Statistics: Posted by Stromeko — Thu Jul 02, 2020 2:19 pm


RTL-SDR Discussion • Driver patch for FC0013 to improve ADS-B

Hi! Can anyone detail how to install the driver patch for FC0013 chips to improve ADS-B reception? There is a patch here
https://github.com/osmocom/rtl-sdr/pull ... a38f41774a but it's not clear to a beginner like me how and where to install it. Any help, much appreciated.
Thanks

Statistics: Posted by bvb40170 — Thu Jul 02, 2020 1:36 pm


User Projects • Re: Absolute FFT Beginner Project

hotpaw2 wrote:
Tue Aug 27, 2019 6:31 pm
There are pointers to SDR DSP tutorials right on this site:
https://www.rtl-sdr.com/tag/digital-signal-processing/

Plus more tutorials online, with source code, such as:
https://www.g0kla.com/sdr/index.php

The ARRL also has pointers to some resources:
http://www.arrl.org/software-defined-radio
Here's one QEX article that says it "minimizes" the math:
http://www.arrl.org/files/file/Technolo ... qex013.pdf
Thanks for the good links and tutorials! I'm a newbie, so this helps me a lot. :) :idea:

Statistics: Posted by makero — Thu Jul 02, 2020 9:23 am


Other SDR Devices • SPECTRAN V6 with 245MHz IQ streaming via USB?

Hi folks!

I just found this new USB SDR from Aaronia: https://aaronia.com/downloads/#tab_4

How can they stream 245MHz IQ via USB? I dont get it.

Whats the price tag?

Statistics: Posted by SDR-Marx — Thu Jul 02, 2020 7:40 am


KerberosSDR • Automatic Syncing Script

I started messing around with figuring out how to automate the syncing and configuration process and came up with this python script. It uses Selenium to navigate and access the kerberosSDR's webpages to configure/sync everything. As of now it configures the kerberosSDR to whatever values are defined at the beginning of the script, so modify those to your own use! It then conducts a sample sync/calibrates the IQ and then disables the noise source. DOA is then enabled using the MUSIC algorithm and the browser closes. At this point you should be able to plug in your antennas and use DOA functionalities. I have been testing it with a Raspberry Pi 4 on the latest v1.6.1 stock image and it runs fine but make a back up of your Pi image if you need to in case anything happens. I just thought I'd share in case it might help anyone and am open to feedback!

https://github.com/Yehia-Helwa/KerberosSDR-Automation

To use it you need to install some dependencies:
sudo pip3 install selenium
sudo apt-get install chromium-chromedriver

To run: (check below before running)
Download and unzip automate.py file to Pi through whatever means you want
Open up terminal and cd to wherever the script is located
Run it using - python3 automate.py

Before you run it make sure:
You open up the script and change the variables at the top to whatever settings you want inputted
Nothing or 50 ohm terminals are connected to antenna inputs
Raspberry Pi has had enough time to start the kerberos software
Best to run from clean boot or after rebooting software

Shoutout to the KerberosSDR team for their great work!

Statistics: Posted by yahelwa — Wed Jul 01, 2020 11:47 pm


Antennas • Re: Airspy YouLoop

The loop I made myself is at lawn-level, so despite being big it is not 'up there' where it would probably be receiving much better.
From what I've read and seen on numerous YouTube videos, the height above ground isn't all that important. If you can get it up about two loop diameters above ground, it should work just fine.

Here's how I built the new loop. I took a 10 foot length of hardline coax (RG-8 or RG-213 will work too) and at the half-way point I removed a half inch section of the outer jacket and the shield. I applied some hot-melt glue to the area and slid a piece of old garden hose over it for reinforcement.

At each end, I removed about an inch of the outer jacket and cut back the shields about half an inch. I also removed about a quarter-inch of the inner insulation to expose the centre conductors. I formed the coax into a loop, bringing the two ends very close together. I soldered a jumper to join the two shields and to also connect them to the shield of the feed line.

The two centre conductors connect to a four turn primary on the balun. The centre conductor and shield of the feed line connect to an eight turn winding on the balun. I used a binocular core, but a small toroid core would work too. After I had checked that everything was connected correctly, I sealed the entire area with hot melt glue.

As you can now appreciate, pictures wouldn't show you much. I should have taken some while building the loop!

73, Bruce, VE3EAR

Statistics: Posted by VE3EAR — Wed Jul 01, 2020 1:37 pm


Antennas • Re: Airspy YouLoop

Do you have a diagram, or maybe some detailed photos, for the new loop you made?

I do have a tall tree nearby, that I wish I could 'decorate' with some wire, but the rules around here does not allow for putting up an outside-antenna, so looking for any possible alternative that can yield extra SNR :)

The loop I made myself is at lawn-level, so despite being big it is not 'up there' where it would probably be receiving much better.

Statistics: Posted by JEL — Wed Jul 01, 2020 2:26 am


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