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Bulgaria

The Bulgarian diplomatic service is active on HF almost daily.

Mode

The mode used is RFSM, emitted on the upper sideband. RFSM is a proprietary derivative of the MIL-STD-188-110 standard, formerly developed and sold by the Russian IDE Group. The Bulgarian diplomatic service uses it with the built-in data masking option enabled, rendering the transmitted data unusable without a copy of the key file.

Network

The network is operational every day from Monday to Friday inclusive, and follows a fixed schedule according to Eastern European Time (UTC+2 in winter, UTC+3 in summer). An 1800 Hz tone may be heard shortly before the start time. The missions usually transmit on a frequency different from Sofia, noted here as QSX.

EET/EEST Sofia Target QSX
09:00 18515 Embassy Beijing 18520
09:30 12228 Embassy Amman 12221
10:00 6779 ? 6774
10165 Embassy Kyiv 10175
10:30 6779 Embassy Chisinau 6774
12228 Embassy Nicosia 12221
11:00 9050 ? ?
12228 Embassy Algiers 12221
11:30 11011 Permanent Mission Geneva 11032
11020 Embassy Beirut 11026
13:00 16297 Embassy Tehran 16210
13:30 14776 Embassy Moscow 14756
14786 Embassy London 14796
14:00 10165 Embassy Rome 10170
12226 Embassy Tunis 12221
14:30 12226 Embassy Paris 12221
15:00 13420 Embassy Cairo 13552
15:30 14786 Embassy Madrid 14796
16:00 11030 Embassy Berlin ?
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