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WXPO // MAY 15, 1987 // DEAD AIR RECORD
May 15, 1987 // Earl Dunston

EARL'S LAST TRANSMISSION

WXPO caught a structured burst after the room went quiet. Earl did not send plaintext. First recover the Morse letters. Then subtract the dial corrections from his callbook.

FIELD COPY OPENARCHIVE RELAY DISCONNECTED
wxpo-deadair-may15 // recovered carrier

Decode 23 Morse letters. Letter gaps are longer than symbol gaps.

Accessibility / signal transcript

The Morse burst transcribes to:

RPEMNVSXSCSLTHTJRIHVQTB
Earl's Callbook // dial corrections

Use A=0 through Z=25. Convert each ciphertext letter to a number, subtract the corresponding correction modulo 26, then convert back to letters.

0707010903080401000205050803010900040407020209
> Transmission unresolved.