Архив за 12.05.2019

User Projects • RTLion Framework [RTL-SDR Framework for RTL2832 based DVB-T receivers]

Hi,
I like to read and learn new stuff about DSP and SDR at my spare time. Currently I'm working on RTL-SDR devices and I've been writing projects to consolidate my learnings. RTLion Framework is a product of my studies over librtlsdr, pyrtlsdr and some other Python dependencies such as Matplotlib and Flask.
Project aims to create a framework for RTL-SDR which supports various features such as showing power spectrum and frequency scanning. It runs a web server for interface which is accessible on the browsers and the Android phones via the RTLion app. Also the project supports containerization and IoT applications.
I'd be thankful for comments about the project, contributions with pull requests and new ideas.
Have a good day : )

Statistics: Posted by KeyLo99 — Sun May 12, 2019 8:06 pm


KerberosSDR • Re: Power connection question

I'm also having problems with choosing the right kind of USB3-PSU as it would seem that the USB power sources I had are simply not giving enough juice for the KSDR and hence I'm having troubles getting it to work properly. I posted this question on another thread that was about the EEPROM, but I guess the question is valid in this one, too:
Also, I'd need to ask what would be a suitable USB power source, i.e. would this one from Belkin be appropriate for the KSDR? I just looked into this model, and it has received only good reviews from its users: https://www.belkin.com/us/p/P-F8M990/

At a Glance:

Universal compatibility
4 USB ports
10 ft. cable
5.4A power
Automatic power adjust for connected devices
Wall-mountable
Elegant design

The bottom line being the highlighted row - is having a USB power source with automatic power adjust such as in the example model above bad idea with the KSDR? Belkin does make otherwise some decent stuff ...
I'd like to hear your take on what constitutes as a decent USB PSU for the KSDR - I'm in northern EU, we're running on 230VAC with an European "Schuko" type AC plugs&sockets.

Statistics: Posted by StandingWave — Sun May 12, 2019 5:38 pm


KerberosSDR • Re: Setting the KerberosSDR EEPROM

Also, I'd need to ask what would be a suitable USB power source, i.e. would this one from Belkin be appropriate for the KSDR? I just looked into this model, and it has received only good reviews from its users: https://www.belkin.com/us/p/P-F8M990/
At a Glance:

Universal compatibility
4 USB ports
10 ft. cable
5.4A power
Automatic power adjust for connected devices
Wall-mountable
Elegant design
The bottom line being the highlighted row - is having a USB power source with automatic power adjust such as in the example model above bad idea with the KSDR? Belkin does make otherwise some decent stuff ...

Statistics: Posted by StandingWave — Sun May 12, 2019 5:34 pm


KerberosSDR • Re: Setting the KerberosSDR EEPROM

rtlsdrblog wrote:
Sun May 12, 2019 5:33 am
Are you powering the KSDR correctly?
Hmm, I'm using a Belkin USB distributor that's 5V @ 2.4A (it's an AC+USB outlet combo). In addition, the device is plugged to my PC's USB3 port via the USB data connection. I tried switching the USB bus power to another USB socket on my PC, but that didn't help out either. Will have to look into where I could find a proper high-amp USB3 power source here in northern EU. Will try to find one and report back if there was any success ....

Cheers!

Statistics: Posted by StandingWave — Sun May 12, 2019 3:51 pm


Other SDR Devices • Re: SDR Upgrade

Jekko wrote:
Mon Apr 29, 2019 12:28 pm
I am oriented to the Sdrplay RSP1A. Do you think that it should resolve the problems mentioned above? Do you know other sdr that should resolve this problems?
Thank you very much
Before choosing SDR, ask yourself which software you prefer to use.

If you like SDR#, then the SdrPlay won't work with that (as far as I am aware at least)

The Airspy (with spyverter to get HF) is by the same person behind SDR#, so fully compatible with all the extra software in that package.

So do not focus on the SDR alone, but the entire SDR+software combo :)

I have both a 'cheap' dongle and an Airspy, and the Airspy is a step up.
I still use both though :) The Airspy does not make the 'cheap' dongle bad, but rather supplements it (2 radios are better than 1 :) )

Statistics: Posted by JEL — Sun May 12, 2019 3:31 pm


Hi all thanks for the add. I have many questions about starting from scratch

Hi all thanks for the add. I have many questions about starting from scratch

(Feed generated with FetchRSS)

144.350 signal recorded withot audi filter.

Hello I cath this signal I recoded withot audio filter

does anyone know what is this ?

https://uploadfiles.io/qxfhyjhc?fbclid=IwAR2CAIM5Oxpy2jBQ7SU7hLTYJsgZeRRXCunBDTEauufQCdHnk19LTgF8aKg

submitted by /u/rsrman
[link] [comments]

KerberosSDR • Re: Interfacing KSDR in C/C++

I've had a quick look, but there aren't really any comments (and still lots of occurences of Hydra). It would be highly appreciated if the general structure of the code and the layout of the FIFO / control channels was explained somewhere.

From my reading of the code (mostly just the C) the most highlevel structure is this: a thread per receiver to read into a circular buffer. Syncing the receivers produces an offset into each circular buffer (except one, I guess) to align the samples. Control (configuring the receivers) goes through some sort of FIFO and is then dispatched to all four receivers.

One of the questions I have is if you need to re-sync after each control change?

Statistics: Posted by Stromeko — Sun May 12, 2019 8:12 am


KerberosSDR • Re: Setting the KerberosSDR EEPROM

StandingWave wrote:
Sat May 11, 2019 10:37 am
OK, so I plugged in the KDSR for the first time, the Generic RTL drivers (for all four RTL-SDR's) installed just fine on Win7/64bit - I see four RTL2832U devices on my Device Manager, but when I run rtl_eeprom.exe (x64) just for a quick overview on what's the status on KSDR, without reading or writing anything into the eeprom, I get this message:

CODE:

\...rtl-sdr-release\x64>rtl_eeprom.exeFound 4 device(s):  0:  Generic RTL2832U  1:  Generic RTL2832U  2:  Generic RTL2832U  3:  Generic RTL2832UUsing device 0: Generic RTL2832Uusb_open error -12Failed to open rtlsdr device #0.
In comparison, when I changed the S/N on my RTL-SDR USB dongle with the same software and computer (I have no SDR units at all plugged into this PC, and I used this same rig to rewrite a RTL-SDR firmware, that worked just fine).

Troubleshoot, Ignore, Abort, Retry?

Any ideas?

Thanks.
Are you powering the KSDR correctly?

Statistics: Posted by rtlsdrblog — Sun May 12, 2019 5:33 am


L Band Antenna

I'm looking to either purchase or build an antenna capable of receiving somewhere in the range of 1.6 - 1.8 GHz. The purpose of this antenna will be to receive weather satellite transmissions that transmit around 1.7 Ghz. This antenna will be mounted to a rotator I'm planning on building. Can anybody offer any advise/info? I'm still pretty new to the world of antenna design, but what I was hoping to do is either buy or build a parabolic dish antenna. Money is definitely a factor, so value is definitely an important factor.

submitted by /u/EsotericWaveform
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