The Frequency That Disappeared: Seven Years of Static, Then Nothing

03:17 this morning. The burst didn't come.

I need to explain what that means, because it's kept me awake for the past twenty hours.

Since April 2019 — 2,557 nights ago, I've counted — there's been a signal. Every night. Same frequency: 4.625 MHz. Same time: 03:17 local. Duration varies between 47 and 53 seconds. It's encrypted, always has been. I've run it through every decryption method a civilian can access. Nothing. The pattern resembles old numbers stations, but the encoding is different. Tighter. More modern.

I've documented every single burst in my logs. Every. Single. One.

The signal strength varies with atmospheric conditions, but it's always there. I've heard it through thunderstorms, ice storms, during the solar flare events last year. When my main receiver died in 2023, I caught it on my backup. When that backup failed, I borrowed Old Harold's ham rig and logged it from his place.

It's the most consistent thing I've ever tracked. More reliable than sunrise.

Until last night.

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03:15: I'm at my station, headphones on, recorder running like always. SDR software showing the waterfall display. I'm watching 4.625 MHz.

03:17:00: Nothing.

03:17:30: Still nothing.

03:18:00: Dead air. Just the normal background static of shortwave at night.

I checked everything. Receiver: working. Antenna: intact. Power supply: stable. I scanned adjacent frequencies — nothing unusual. I checked other known signals to verify my equipment was functioning. Everything else was normal.

The frequency that has been occupied every single night for seven years was just... empty.

---

I stayed at the station until dawn. Checked again at 03:17 this afternoon in case I'd somehow gotten the timing wrong. Nothing. Reviewed my logs going back to 2019, looking for any previous gaps. There weren't any.

Here's what I keep coming back to: After seven years of absolute consistency, why stop now?

---

The rational explanations are obvious, and I have to consider them:

The transmission source could have been decommissioned. Military installations shut down. Communications protocols change. Equipment fails. If this was a legitimate government or military signal — and the regularity suggests institutional origin — then maybe whatever generated it simply ended its operational life. Budget cuts. Technology upgrades. Mission completion.

Or the source could have relocated. Maybe they're still transmitting, just from a different location that's outside my reception range. Shortwave propagation is complex. A shift in transmission site could put them in a skip zone I can't reach.

Both explanations are perfectly reasonable. Mundane, even.

But.

Seven years. 2,557 nights. The numbers don't lie, but they don't always tell the whole truth either. That level of consistency isn't typical for routine military comms. Numbers stations operate for years, yes, but they're usually part of larger networks with varying schedules. This was different. This was a clock.

And now the clock has stopped.

---

I've been doing this long enough to know that absence can be more significant than presence. When something that regular just... ends... it means something changed. Whether that change is a bureaucratic decision or something else entirely, I can't say.

What I can say: I'm watching 4.625 MHz tonight. And tomorrow night. And the night after that.

Another entry for the log.

—JohnD

Have you monitored any frequencies that suddenly went dark? And does anyone else think seven years is a strange operational lifespan for a signal that consistent?