| 摘要 |
<p>The system has an ascending converter block (8) provided with a mixer (11), whose outputs are added by an adder (12) amplified by an amplifier (13), where an output of the block constitutes a processed radio frequency output (SRF2) of a selected channel. An oscillator (7) is controlled by a phase lock loop, where outputs of the oscillator having cosine function and sine function respectively correspond to two base bands and are out of phase by 90 degrees relative to each other. The outputs of the oscillator are sent to mixers (10, 11) of a descending converter block (5) and of the block (8).</p> |
