Архив за 22.05.2019

RTL-SDR Discussion • Re: RTL-SDR Malfunction?

some new motherboards uses a new USB3 only controller and such motherboards doesn't supported with old libusb. This bug was fixed in RC version of libraries. But it is still not available to download in binary format. You're need to get latest RC version of libusb source and compile your own rtlsdr.dll

You can use rtlsdr.dll which I placed to my custom ExtIO driver. This version of rtlsdr.dll works ok with a new USB3 motherboards. See this topic: viewtopic.php?f=1&t=4710

Statistics: Posted by qrp — Wed May 22, 2019 11:50 pm


RTL-SDR Discussion • ExtIO_RTLSDR# — custom ExtIO for RTLSDR

Hi guys, I just wrote custom ExtIO driver for RTLSDR dongle, may be it will be interested for someone.
It has integrated DC remove filter and allows to setup any possible sample rate.
This ExtIO works through librtlsdr.dll from OSMOCOM (librtlsdr.dll should be renamed to rtlsdr.dll).

I wrote it because existing ExtIO_RTLSDR for some reason doesn't works in Direct Sampling mode with SDRUno. So, there is no way to receive MF and HF stations (0-14 MHz) with SDRUno and RTLSDR. This ExtIO works ok in such mode. Also I added DC remove filter, because it is missing from SDRUno.ExtIO, you can enable/disable it from ExtIO settings window.

It is written in C#, so I named it ExtIO_RTLSDR# :)
Also it means, that it requires .NET Framework Runtime 4.0. Usually it is already present on windows operating system, but if it is not, it should be installed from this page: https://dotnet.microsoft.com/download/d ... work/net40

Bug reports and suggestions are welcome.

I included rtlsdr.dll compiled from OSMOCOM source (librtlsdr + libusb v1.0.22-rc4).
But you can replace it with other versions, just rename librtlsdr.dll to rtlsdr.dll and place near ExtIO_RTLSDR_u8.dll.

For HDSDR, you're need to place this file near HDSDR.exe, also rtlsdr.dll should be placed near ExtIO_RTLSDR_u8.dll.
For SDRUno, you're need to place it into My Documents folder.

You can use several ExtIO drivers, just place it together and HDSDR/SDRUno will ask which one should be opened at startup.
ExtIO_RTLSDR_u8-1.0.0.1.zip

Statistics: Posted by qrp — Wed May 22, 2019 11:20 pm


Comment on Stratux 1090 MHz + 978 MHz Diplexer Now Available by snn47

Did anyone find some real information on the filter besides just the quoted insertion loss like e.g.
– filter bandwidth,
– how fast the filter drops off,
– the max. attenuation or
– IP

PS: I remember that UAT on 978 MHz was implemented by FAA so far in the US only for operational use in the Alaska region. It was just recently announced to be extended to other states.

KerberosSDR • Re: Problems with kerberossdr util on Linux/Raspberry Pi 3B+ / waveforms not updating

For scipy if you're having trouble on a Pi3, you could try installing it from the repo's instead.

apt-get install python3-scipy

But if you're on a Pi3, why not use the provided image?

Statistics: Posted by rtlsdrblog — Wed May 22, 2019 10:34 pm


KerberosSDR • Re: Problems with kerberossdr util on Linux/Raspberry Pi 3B+ / waveforms not updating

What is the actual difference between the RPi Tinkerboard image version and the regular KSDR util image? That (among a plethora of other things) isn't described in much detail anywhere.
I'm not sure what you mean by the regular KSDR util image? There are only two images. One for the Tinkerboard and one for the Pi 3.

The images simply have the software preinstalled on it, so there's no need to go through and manually install the program and dependencies.

Statistics: Posted by rtlsdrblog — Wed May 22, 2019 10:32 pm


KerberosSDR • Re: Power connection question

Stromeko wrote:
Wed May 22, 2019 7:35 pm
OK, that reply confirms my suspicion. Please have them read the USB spec to come up with a spec compliant way to do a power sink with a USB-C connector. Again, you need pull-down resistors there, not pull-up.

So in summary the only option of powering through this connector is to try and get a non-compliant PSU that isn't probing VCONN and always powers VBUS without current limit, which excludes almost anything you can buy in the EU. The best bet are the PSU that have a captive cable ending in a USB-C, especially if that same model is available with other plugs or even with a set of adapters. It looks like all of these I can find are direct shipping from China.
They don't sell standard 5V, 3A supplies with USB-A out in the EU? The idea is to simply use a USB-A to USB-C cable with a standard USB-A out supply. If a microUSB or miniUSB port was used on the Kerberos would you have the same problem? You can also use a microUSB to USB-C adapter in a pinch.

The electronics designer from Othernet is based in the EU, and he didn't seem to have have any issues finding supplies that work during the prototyping stages.

In the next batch we'll implement the resistors so that PD supplies can be used. It wasn't done in the first batch because apparently we need to go to a higher level of PCB manufacturing technology in order to create the micro vias that USB-C needs to get the traces out to the resistors.

Statistics: Posted by rtlsdrblog — Wed May 22, 2019 10:30 pm


Comment on SDR4Everyone: Getting Started with the RTL-SDR and SDRUno by qrp

A little update v1.0.0.1, fixed setting save for gain: https://drive.google.com/file/d/1z3IzuA6f6252T5pbTz8u3NOePR29gRS7/view?usp=sharing

Comment on Submit a Story/Contact by qrp

here is a little update v1.0.0.1, fixed setting save for the gain: https://drive.google.com/file/d/1z3IzuA6f6252T5pbTz8u3NOePR29gRS7/view?usp=sharing

Comment on Submit a Story/Contact by qrp

I wrote custom ExtIO for RTLSDR. I named it ExtIO_RTLSDR#, because it is written in c#. It allows to use direct sampling mode in SDRUno, use custom sample rates, has logging and integrated DC remove filter (can be disabled). It works through standard rtlsdr.dll from osmocom. May be it will be interested for someone… 🙂

Here is download link: https://drive.google.com/file/d/1xW8YlmQfV-VSsJXnLhXTWZ1mduLQ5Xe2/view?usp=sharing

Since it is written in c#, it requires .NET runtime 4.0 to be installed. Usually it is already present on modern windows systems, but may be missed for some reason, so in that case you can install it from this link: https://dotnet.microsoft.com/download/dotnet-framework/net40

If you found some bug, or want some additional features, please let me know. 🙂

KerberosSDR • Re: Power connection question

OK, that reply confirms my suspicion. Please have them read the USB spec to come up with a spec compliant way to do a power sink with a USB-C connector. Again, you need pull-down resistors there, not pull-up.

So in summary the only option of powering through this connector is to try and get a non-compliant PSU that isn't probing VCONN and always powers VBUS without current limit, which excludes almost anything you can buy in the EU. The best bet are the PSU that have a captive cable ending in a USB-C, especially if that same model is available with other plugs or even with a set of adapters. It looks like all of these I can find are direct shipping from China.

Statistics: Posted by Stromeko — Wed May 22, 2019 7:35 pm


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