I know this is an old thread now, but I had to make a report anyway.
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Heard this LOUD signal; a steady AM carrier with a clean tone sending Morse code (MCW mode) at about 15 WPM.
I copied it for a while and it seemed to be all five plain character groups, obviously ciphertext.
So I tuned the main rig (IC-735) over there and noted the frequency as 8097 Khz. And was it LOUD!
On a 20m double extended Zepp (long dipole wire) up only 30ft it was nearly pinning the S meter!!!
Now note - this was at 14:30 in the afternoon, and I am located near Sarasota Florida ...
So I have to believe this is probably another one of the famous "spy" transmitters located in Cuba.
But I am still amazed at the signal strength! They must be really pouring on the coals; louder then I have ever heard Radio Havana!
Who needs the internet? US CIA / FBI probably doesn even have signal analysts that can copy Morse anymore. This is so low tech, ie, reliable, easy to access, Boris and Natasha could hear it literally on an xtal set !!!
More like about as loud as you hear Radio Havana, as it most likely comes from one of RHC's own transmitters
. It has been speculated for years that this signal and another couple use RHC transmitters, speculation is based on many things, but cross-talk and the occasional cutting in and out of RHC audio during a numbers TX is not unheard of. The RHC audio popping up in the middle of a V2 or M8 numbers TX is a pretty strong indicator.
The signal in this thread is Cuban numbers station M8a. The frequency is 8096 kHz, the mode is AM, and the modulation is MCW. It can, naturally, be received equally well in AM, LSB or USB whern tuned to 8096 kHz, even CW if you tune to the tone frequency, not the carrier. If you tune to the tone instead of the carrier, tuning in CW mode on the RX using most modern radios with CW offset, you will find your readout saying about 8095 when tuned to the low side, and about 8097 when tuned to the high side (as the tone is about 1 kHz). On their current schedule this frequency is used every Monday, Wednesday, and Friday starting about 1400 UTC, and may be used other times also.
The comment several post back about this being letters, not numbers...this station very often uses "cut numbers". Still numbers, just not 5 morse element numbers.
T!
Mohave Desert, California, USA