Check Radio Connection

Block Connection to RTL-SDR

To verify that an RTL-SDR Receiver block is connected to RTL-SDR hardware, follow these steps.

1. Open the model that contains the RTL-SDR Receiver block for which you want to check the connection.

2. Open the block mask by double-clicking the block. If the block is connected to the RTL-SDR hardware, click Info to return this information from the radio. Values going to the RTL-SDR radio are often quantized by the hardware. These values are the actual RTL-SDR device settings.

   • RadioName

   • RadioAddress

   • RadioIsOpen

   • TunerName

   • Manufacturer

   • Product

   • SerialNumber

   • GainValues

   • RTLCrystalFrequency

   • TunerCrystalFrequency

   • SamplingMode

   • OffsetTuning

   • CenterFrequency

   • SampleRate

   • TunerGain

   • FrequencyCorrection

   If the block is not connected to the RTL-SDR hardware, click Info to return this message in the RadioName field: 'Cannot find radio'.

Note

A block can connect to only one receiver at a time on the same radio address.

System Object Connection to RTL-SDR

To verify that an RTL-SDR receiver System object™ is connected to RTL-SDR hardware, follow these steps.

1. Identify the radio address that is associated with the comm.SDRRTLReceiver System object for which you want to check the connection. For this example, create a default RTL-SDR receiver System object. The radio address for this System object is 0.

   radio = comm.SDRRTLReceiver

   radio = 
    comm.SDRRTLReceiver with properties:
    
              RadioAddress: '0'
           CenterFrequency: 102500000
            EnableTunerAGC: true
                SampleRate: 250000
            OutputDataType: 'int16'
           SamplesPerFrame: 1024
       FrequencyCorrection: 0
           EnableBurstMode: false

2. Report the radio information of all RTL-SDR hardware that is connected to the host computer by using the sdrinfo function, specifying the radio address associated with the System object as the function input..

   hwinfo = sdrinfo('0')

   If a radio is connected to the specified radio address, then the RTL-SDR hardware returns this information.

   hwinfo = 
                   RadioName: 'NESDR'
                RadioAddress: '0'
                 RadioIsOpen: 0
                   TunerName: 'E4000'
                Manufacturer: 'NooElec'
                     Product: 'NESDR SMArTee X'
                  GainValues: [14×1 double]
         RTLCrystalFrequency: 28800000
       TunerCrystalFrequency: 28800000
                SamplingMode: 'Quadrature'
                OffsetTuning: 'Disabled'

Note

A System object can connect to only one subdevice (receiver) at a time on the same radio address. When you call the info object function, the RTL-SDR radio System object connects to a subdevice and stays connected until you call the release object function.