Chaos on 6712 kHz (HFDL basic freq)

A couple of days ago I was monitoring 6712 kHz.
The frequency is listed for Reykjavik Ground station, but on the air was Krasnodarsk Ground station.
As was not enough strange, on the same frequency a lady was dictating numbers... No, it was not a "Numbers station" in the classic mean. It sounds more like a network controller...
At the top, was a Jamming signal...

After a few minutes, the lady ceased transmission and Reykjavik GS was back on the air!!!

Very strange!

Here is a record.

Air traffic on 5655kHz

This evening, as usually, I was monitoring 5655kHz for some air traffic.
And there it was!
I was able to receive and decode HFDL from HAT-Yai Airport from Thailanda.
What was very unusual was that, on the same frequency, I was able to hear some USB Phone operations.
Anyway, It was impressive that the signal was very clear and noiseless!

Romanian Numbers Station

Putini sunt cei care isi arata preocuparea pentru asa numitele "Numbers Stations" la noi in tara.
Sub aceasta titulatura se ascund anumite emisiuni destinate agentilor care opereaza in tari straine, sub acoperire.
Tehnic vorbind, este vorba de un emitator, de regula in gama undelor scurte, ce transmite siruri de cifre, prearanjate dupa un anume algoritm, intr-una din gamele de frecventa folosite de emitatoarele de radiodifuziune comerciale sau nationale, de regula in modulatie de amplitudine sau in modulatie cu o banda laterala suprimata.
Sirurile de cifre reprezinta un mesaj criptat printr-o metoda de unica folosinta (tabla de criptare).
Mesajul este adresat unui agent care detine tabela unica de decriptare si care, prin folosirea acestiea, recupereaza mesajul.
Principalele avantaje ale acestei metode de comunicare (unidirectionala) sunt:
-posibilitatea ca agentul sa preia mesajul indiferent unde se gaseste pe teritoriul strain;
-absenta riscului generat de posesia unor mijloace specifice de comunicatie cu centrala de operatiuni;
-rezistenta la penetrare a codului folosit.

Ce se stie mai putin este ca si Romania a folosit astfel de metode de transmitere a mesajelor catre agentii sai din strainatate!
Aici puteti descarca un astfel de mesaj in format .mp3.