4U-ADP
| Broadcast area | Teudallum |
|---|---|
| Frequency | 8710 kHz (day) 3818 kHz (night) |
| First air date | October 21, 1965 (first heard) |
| Format | Repeated two-beep tone, ocassionally interrupted by voice transmission |
| Language(s) | Serbian |
| Former callsigns | Pokriv-61, Galeb-10 |
| Former frequencies | 5172 kHz, 8010 kHz |
| Operator | Nikolian Royal Army (Unconfirmed) |
The 4U-ADP, also known as the Beeper is a nickname given by amateur radio operators and listeners to a shortwave station that broadcasts on the frequencies 8710 kHz during the day and 3818 kHz during the night. Its distinctive interval signal is two beep tone similar to a dialing tone on landline telephones. The two beeps are separated by 0.5sec pause, while one second pause divides the two beep group, for a total of 80 beeps per minute, 24h a day.
The interval signal is sometimes interrupted with a continuous 5 second beep, followed by a 10 second pause, after which a live voice transmission in Serbian takes place. The first reports of this station happened in 1965, likely connected by the Nikolian intervention in the Caranad Conflict.
Name
Format
Voice messages
Sometimes the beeping interval signal stops, being followed by a continuous 5 second beep, after which a voice message with a fixed format follows. In the first recorded message in 1965, the Beeper used the callsign Pokrov-61, and the message was:
Pokrov-61, Pokrov-61, 24GPE 87 51 121 ZAHVAT 67 541 61 77, ponavljam, 2-4-Gustav-Pavel-Eva, 2-4-Gustav-Pavel-Eva, Zebra-Ana-Henrik-Violeta-Ana-Tomas 6-7 5-4-1 6-1 7-7 Pokrov-61 gotovo.