The Frequency That Disappeared — 4.625 MHz and the 72-Hour Silence

0237 Hours, November 6th, 2024

I've been monitoring 4.625 MHz since January 2022. Every night — *every single night* for 1,047 consecutive nights — there's been a transmission at 0230 hours.

Until three nights ago.

Let me back up.

## The Signal

It started as background noise during my routine frequency sweeps. Short bursts, lasting 47 seconds (yes, that number again). Digital modulation, possibly encrypted. Not voice. Not standard morse. The pattern repeats exactly: three bursts, 17-second gaps between them, then silence until the next night.

I've logged every transmission. I've cross-referenced with known military exercises, weather satellite schedules, even amateur radio nets. Nothing matches. The frequency itself is in a range used by numbers stations — those Cold War relics that still broadcast encrypted messages to... someone.

But this wasn't like the famous stations. No voice. No number sequences. Just data.

The pattern was perfect. Until it wasn't.

## The Silence

November 3rd, 0230 hours: Nothing.

I checked my equipment — antenna connections solid, SDR receiver functioning, no local interference. I scanned adjacent frequencies. I waited until 0400 hours.

Silence.

November 4th: Still nothing.

November 5th: Nothing.

Tonight, November 6th: I'm listening right now. Static. The frequency is dead.

## What Changed?

Here's what I know happened in the 72 hours before the silence:

• November 1st: Spotted three unmarked vehicles on Route 64 near Mile Marker 17, stopped for approximately 90 minutes
• November 2nd: Unusual aerial activity over The Ridge — possibly drones, possibly conventional aircraft, too distant to identify
• November 3rd, 1800 hours: Brief power fluctuation in my solar system despite clear skies and full charge
• November 3rd, 0230 hours: The transmission that never came

Coincidence has a pattern if you look long enough.

## The Alternative

I've been doing this for seven years now. I know what confirmation bias looks like. So let me be honest about the mundane explanation:

Numbers stations shut down. Maybe whoever was receiving this signal doesn't need it anymore. Maybe it was a military exercise that concluded. Maybe it was never meant to last forever, and I just happened to catch a three-year operational window.

The vehicles could've been surveyors — they appear every fall. The aerial activity could've been National Guard exercises from the base 60 miles north. The power fluctuation could've been a loose connection I haven't found yet.

The transmission stopping on the same day I noticed increased local activity could be pure coincidence.

Could be.

## The Problem

But here's what bothers me: In three years of monitoring, I never — *never* — recorded a single missed transmission. Not during thunderstorms. Not during the ice storm last February. Not during solar flares that knocked out half my equipment.

This signal was reliable to the second. Whatever was broadcasting it had power, infrastructure, and a reason to maintain that schedule.

And then it stopped.

Not degraded. Not moved to a different frequency. Not changed its pattern.

Just... gone.

I'm still listening. The notebook is open. The recorder is running.

But the frequency that never missed a night has been silent for 72 hours.

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*Another entry for the log.*

Have you ever monitored something so consistent that its absence feels like a message in itself? And what does it mean when something that operated with military precision simply vanishes — do we assume it completed its mission, or do we worry about what mission might come next?