G: Short answer (TL;DR):

• No signal can beat the speed of light.
• You can’t get distance “for free” from a single passive signal.
• To make your delay idea work, you must measure distance, and that requires either timing, multiple receivers, or special encoding—there’s no shortcut baked into physics.

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Why your idea feels like it should work

You’re imagining something like:

“The signal arrives, and somehow the receiver just knows how far it traveled, and delays itself accordingly.”

The catch is this:
A signal arriving at a receiver contains no built-in tag that says how far it traveled.

Distance only shows up in physics through time, angle, or intensity changes—and all of those require comparison.

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The core limitation (this is the wall you hit)

At a fundamental level:

• Signals travel at a fixed speed (radio/light ≈ c).
• The receiver sees: “I got a signal at time T.”
• But it does not know when the signal was sent unless:
  • It has a synchronized clock, or
  • The signal encodes timing info.

Without that, distance is unknowable.

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What actually works (real-world methods)

1. Time-of-flight (the clean solution)

This is how radar, lidar, and GPS work.

You measure:

• Send time vs receive time
  → distance = speed × time

This is the only direct way.

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2. Round-trip timing (two-way systems)

Used in radar:

• Send a signal
• It reflects or replies
• Measure total travel time

No need for perfect clock sync, but still timing-based.

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3. Signal strength (rough, unreliable)

Signal gets weaker with distance.

But:

• Walls, interference, orientation all mess it up
• Not precise enough for deterministic delays

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4. Phase or frequency tricks

Used in RF systems:

• Compare phase shifts or Doppler changes
• Requires known reference signals

Still depends on comparisons—not a single passive read.

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5. Multiple receivers (triangulation)

Like GPS:

• Compare arrival times at different points
• Infer position

Again: requires multiple points or clocks.

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What you specifically asked:

“Can a single system detect distance from a signal and use it to delay activation?”

Answer: No, not by itself.

A single receiver with:

• no prior synchronization
• no return signal
• no multiple antennas

→ cannot determine distance from one incoming signal.

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Why there’s no “hidden shortcut”

If such a system existed:

• You could determine distance instantly from a single signal
• That would imply extracting information about travel time without measuring time
• Which breaks causality constraints tied to relativity

That’s why it doesn’t exist.

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Closest thing to what you want (practical workaround)

You can build something that behaves like your idea:

• Transmitter includes a timestamp
• Receiver compares with its own clock
• Calculates distance
• Applies delay

That’s basically a simplified version of how entity["scientific_concept","Global Positioning System","GPS satellite navigation system"] works.

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Bottom line

Your instinct is right that a composite system can do it easily.

But the shortcut you’re looking for—
a single passive receiver that instantly knows distance from a signal—
doesn’t exist because distance is not an intrinsic property of a signal.

It only emerges when you compare time, phase, or multiple observations.