A letter postmarked hours before a signal existed matched it perfectly - interval for interval

A letter postmarked hours before a signal existed matched it perfectly - interval for interval

Fear and curiosity collide when a handwritten page predicts a radio transmission down to every burst and pause: seventeen rows, forty-four seconds per cycle, and a postmark time that should have been impossible. Who sent a message that matched an unknown hydrogen-line signal interval for interval, and how could anyone have known what would appear thirteen hours later?

In this episode, we follow the timeline from a rural mailbox to a remote observatory as investigators trace a precise correlation between a physical letter and a six-hour radio event; what the episode covers is the sequence of events, the recordings, and the central unresolved question about causation and timing.

Date: November 9
Time first noted in mailbox impression: 7:41 a.m.
Signal start time at Harwick Ridge: 9:16 p.m.
Signal duration: 6 hours 31 minutes
Signal repeat interval: 44 seconds (17 sub-intervals per cycle)

- A plain white envelope addressed to "Whoever Is Working the Scope Tonight" was found in a mailbox just before 6:00 a.m, by a 14-year-old delivery runner.
- The envelope carried a smeared upper-corner impression reading 7:41 a.m., November 9, with a date eleven days off from the visible stamp.
- At 9:16 p.m., Tracy Petersen recorded a signal at 1421 MHz (the hydrogen line) that repeated the same 44-second pattern for 6 hours 31 minutes and stopped cleanly at 3:47 a.m.
- The handwritten letter contained seventeen rows of short and long dashes and the line: "You'll hear this tonight. Start recording at nine p.m. Don't stop until morning. - A friend."
- Investigators confirmed exactly seventeen sub-intervals per 44-second cycle matched the letter's markings, raising the question of whether any human could have arranged the timing.

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