Question

Digital Modular Radio offers coverage of ____

(a) 2 KHz to 2 MHz

(b) 2 MHz to 2 GHz

(c) 2 KHz to 5 MHz

(d) 2 MHz to 5 GHz

I have been asked this question in a national level competition.

Query is from Aware Radios in section Cognitive Radio Basics of Cognitive Radio

Answer 1

Right answer is (b) 2 MHz to 2 GHz

Explanation: Digital modular consists of four programmable RF channels with coverage of 2 MHz to 2 GHz with duplex communication. It does not require any change in hardware to modify the waveform being used.