Discussion
A receiver hisses badly with the antenna connected but is quiet with it replaced by a termination. What does this indicate?
Answer: D
Since the receiver is quiet on a matched load, its own noise is normal, so the noise is external and arrives through the antenna - man-made interference, atmospheric noise, or a nearby source. An excess-noise first stage would hiss on the termination too, which is precisely why that substitution is the standard test. Misalignment would change sensitivity and selectivity rather than produce this asymmetry. And a detector below threshold needs a signal to demonstrate it. Substituting a known quiet source for the antenna separates internal from external noise in one step, and it should be the first measurement taken.
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