Qradiolink

[Karlyn Hemmerling]

I have been interested to install QRadio-link on my smartphone.
On an old thread Adim was thinking of releasing the Android version of QRadio-link but I have not seen further news.
Anyone here may have a running version of QRadio-link on Android. I can do the electronic but the coding is not my forte so porting a Linux app to Android is a bit beyond my abilities.
I do appreciate any help so I can finish building my VHF, UHF, SHF portable station with the LimeSDR mini.
73 de Pat W3PO

The next iteration of this SDR transceiver is a faithful clone of Gqrx but with transmit capabilities for most common waveforms, including FreeDV.
Here is a preview of what the desktop interface will look like:

First of all thank you adim. I was hoping you were the one to answer this question.
What I am trying to realize is the smallest VHF UHF microwaves transceiver.
Now the UI can come in 2 folds: either a mobile phone to interface with the limesdr mini or a raspberry PI zero. I am not so sure the pi zero has the muscle to run KDE mobile but a cheap Chinese phone will.
Now if the PI is strong enough I will include the whole package ( UI+ limesdr mini+ amp and filters and battery)in one box.
Now if the phone becomes the solution then the package minus the UI will be in a box and the phone/UI will be connected via cable or BT.
I read info on KDE mobile on their site and just with the info in it it seems the software might be good and stable.
As for your new iteration of Qradiolink I will keep an eye on your site for the announcement.
So thanks again for the answer and your software is definitely the answer for my small portable transceiver.
thank you again and 73 de Pat W3PO
PS if you need a beta tester for the new Qradiolink then please call on me. I have been an active Ham for 44 years and just retired as a ship Captain for Maersk lines ltd.

Thank you Adi,
I am on the exploring stage and I am looking at what to do with the Limesdr mini.
The smartphone with KDE mobile seems an interesting route as it keep the UI and the radio innards in separate locations.
I have been reading on KDE mobile and a cheap Chinese phone would be the start of the experiment. Also I found on google play apps like Linux deploy and Andronix but now I shall be searching for something with Qt5 support.
Also if you have the time please let me know what you think of KDE mobile as of now. Their web page seems to suggest it is ready for prime time.
I went and looked at the PI nano but the power consumption seems to pit it out of the running.
Congrats on the new release of qradiolink I shall follow with great interest and DL as soon as I find a suitable platform
Cheers de Pat W3PO

Hello all,
I am not so sure anyone looking at this thread anymore but my search continues.
I have explored the eventual rooting to windows 10 mobile which will support Qt5. Anyhow I have understood that for audio issues I have to disassociate myself from Android.
Now there is always KDE mobile but before I root I like to hear from people who might have experimented on this route or any other route as a matter of fact, as I am fairly certain that i am not the only one looking for a solution in a mobile environment.
Adi new Qradiolink looks promising but the telephone platform is still an unknown.
Also i have a mobile phone with USB3 so the connection to the limeSDR mini should not be an issue.
Thanks to all for any input
73 de Pat W3PO

Thank you Adi and Marty,
I really like what Adi is doing with his software and most of all the various modes.
For the time being I shall wait and see to discover what he hears out on various platforms.
Anyhow this idea is taking shape and I have time as I am miles away from the LimeSDR mini.
I travel quite a bit in my retirements days and now I am spending this coming winter in the Philippines so tests with the SDR will have to wait till spring 2020 but the testing of the software on the phone can start.
Marty I am very familiar with SDR angel and I have a copy on my computer even though these days SDRconsole is my preferred app with the mini
Cheers de Pat DU3/W3PO

Back in September we posted [1, 2] about the QRadioLink software which is an RTL-SDR compatible digital amateur radio voice decoder and encoder program for Linux and Android (with chroot). It supports modern digital voice codecs like Codec2 and Opus. It is capable of being used with multiple SDRs, and can be used for transmitting digital voice too if you have a transmit capable SDR.

Andrian the developer recently wrote in to let us know that QRadioLink now has a website at qradiolink.org that you can follow for updates about its development. The website also explains some of the features of the software, and lists possible performance values of digital voice. The features include:

In the future Adrian hopes to expand the software to include features like VOIP integration, SSB transceiver, DTMF & CTCSS encoder/decoders, multi-channel RX, HD video, remote control and a GUI improvement.

Over on YouTube Adrian M has recently uploaded a new video showing a comparison of QRadioLink receiving SSB, NFM, Codec2 and Opus voice signals at the same initial power levels. The results show that the digital modes are generally much clearer and static free even at low TX levels. He writes:

Thank you to Adrian for submitting his video about using the Android App called QRadioLink and an RTL-SDR to decode digital amateur radio voice transmissions. Adrian writes that in the video the RTL-SDR connects to the Android phone with a USB OTG cable and uses a sample rate of 1 MSPS. He also writes the following about QRadioLink:

QRadioLink is a building platform which allows experimenting with VHF-UHF SDR transceivers using different modulation schemes for digital data transmissions. So far digital voice and text transmission is supported, using either a narrow band modem and Codec2 or a high bandwidth modem and Opus. Supported hardware includes the RTL-SDR, Ettus USRP, HackRF, BladeRF and in general all devices supported by libgnuradio-osmosdr.

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