The controlled source E1 is dependent on the voltage at Node 3. 4, i.e. the antenna load , and creates an exact replica of it to feed that is fed into the echo block. Node 6 indeed represents the receive antenna, or the receiver's entry point. The received signal is amplified by the low-noise amplifier '''Gain Block''' LNA with a gain of 5e+3. This signal is then mixed with the other half of the split chirp signal using the '''Multiplier Block''' MIX. The down-converted signal is then amplified once more by the '''Gain Block''' AMP with a gain of 50 and is passed through a generic lowpass filter block with a cutoff frequency of 2MHz.
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