Desired Versus Actual Value in Receiver Block

For the RTL-SDR Receiver block, when you specify the parameter values to set the center frequency, sample rate, and frequency correction, the block initially performs rudimentary checks to verify that the values are scalar and real. So long as the specified values pass those rudimentary checks, the values can be out of range for the RTL-SDR radio. In this case, the hardware makes its best effort to set the specified value and reports the actual value on the block mask.

Desired Versus Actual Value in Receiver System Object

The comm.SDRRTLReceiver System object™ properties display the specified values for the center frequency, sample rate, and frequency correction. However, due to quantization or range issues, the actual values can differ from your desired values.

For example, create a comm.SDRRTLReceiver System object, and then specify the center frequency.

h = comm.SDRRTLReciver
h.CenterFrequency = 1.03e9

r = info(h);
r.CenterFrequency