How to use a SDR-USB receiver on smartphone / tablet
All radio amateurs and listeners know that you can use a memory stick for DVB-T USB receiver chip RTL2832 as broadband. These USB flash drives are produced in order to allow the vision of TV on the PC, but we use it as the amateur radio receiver.
Many have experienced the reception with a device RTL2832 or R820T on PC with programs like SDR# , but you can connect your USB stick SDR also to a smartphone or tablet with the program Martin Marinov called SDR-Touch.
In order to use your RTL2832 stick on your Android device you need as a prerequisite that it is compatible with USB-OTG teconlogia.
USB On-The-Go, often abbreviated to USB OTG or just OTG, is a specification first used in late 2001 that allows USB devices such as digital audio players or mobile phones to act as a host, allowing other USB devices such as USB flash drives, digital cameras, mice or keyboards to be attached to them. Use of USB On-The-Go allows those devices to switch back and forth between the roles of host and client devices. For instance, a mobile phone may read from removable media as the host device, but present itself as a USB Mass Storage Device when connected to a host computer.
In other words, USB On-The-Go introduces the concept of a device performing both master and slave roles – whenever two USB devices are connected and one of them is a USB On-The-Go device, they establish a communication link. The device controlling the link is called the master or host, while the other is called the slave or peripheral.
The basic requirement is so that your tablet or smartphone is compatible with OTG technology, to test it, you can download an app to test, or if you have a USB-micorUSB reducer, you can try to connect a USB memory and you will see the files contained in it or connect a mouse and see the arrow appear on the screen.
So you will need to have:
- An Android device compatible with USB-OTG
- A USB adapter cable female - male microUSB
- SDR-Touch installed on your smartphone o tablet
- An DVB-T USB device with chip RTL2832 or R820T
- Driver of USB device, downloadable byGooglePlay
You can buy your USB-OTG directly from here by clicking on the banner Amazon. By purchasing through the site it will that a small percentage of the cost, the price will remain the same to you; you can buy from here making me have the small percentage as a thank you for the article.
User Guide to SDR-Touch
Operation is intuitive, once installed and run driver, you will need to download and run the software SDR-Touch, you are not required configurations, if not disable the automatic AGC and set it manually. I also recommend to select them the option to vary the bandwidth of the signal only with a long press on the touch.
This is a snapshot of the running program, we can see on the left the memories, to center the spectrogram and waterfall, tuning scale and frequency, and right options.
This video made by me shows the program SDR-Touch function on my smartphone Sony Xperia SP.
The program SDR-Touch is a fee, but you can use it in DEMO version having the waterfall and spectrogram limited to about 1 minute. All other functions will be present. If you do not want to buy you can be used very well manage without the demo display spectrum and waterfall.