Yugoslavian 20-Tone Modem
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| Frequencies | 3 MHz,30 MHz |
| Frequency Range | 3 MHz - 30 MHz |
| Mode | USB |
| Modulation | PSK,OFDM |
| ACF | — |
| Emission Designator | — |
| Bandwidth | 2.2 kHz |
| Location | Europe |
| Short Description | The Yugoslavian 20-Tone Modem, also known as YUG-MIL 20-Tone and YUG Diplo 20-Tone, is a 20 tone OFDM PSK modem used in former Yugoslavia for military and diplomatic use. No longer used today. |
| I/Q Raw Recording | — |
| Audio Sample | |
The Yugoslavian 20-Tone Modem, also known as YUG-MIL 20-Tone and YUG Diplo 20-tone, is a 20 tone OFDMOrthogonal Frequency-Division Multiplexing PSKPhase-Shift Keying modem used in former Yugoslavia for military and diplomatic use. No longer used today.
Characteristics[edit]
The 20-tone modem spans about 2200 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). of bandwidth. Each subcarrier is shifted 110 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). and uses BPSKBinary Phase-Shift Keying (1 bit per symbol) at 75 BdBaud (unit symbol Bd) is the unit for symbol rate or modulation rate in symbols per second. each, for a total data rate of 1500 bpsBits per second (bps). The preamble is similar to that of the MIL-STD-188-110 39-Tone Modem.
Military[edit]
The first three unmodulated tones have a duration of ~530ms with an 880 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). shift between them. Afterwards, a two-tone BPSKBinary Phase-Shift Keying (1 bit per symbol) preamble starts, also at 880 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). shift but centered and with a duration of ~550ms. Some data is transmitted by the two-tone BPSKBinary Phase-Shift Keying (1 bit per symbol) preamble, possibly for syncing and decoding purposes.
Diplomatic[edit]
Has the same three unmodulated tones but with a longer duration of ~650ms with 950 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). shift between tones. Afterwards, there is a single BPSKBinary Phase-Shift Keying (1 bit per symbol) preamble with a unmodulated tone at a 900 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). shift. This preamble lasts ~440ms. Like the Military variant, the BPSKBinary Phase-Shift Keying (1 bit per symbol) preamble sends data.
The Diplomatic variant uses ARQAutomatic Repeat reQuestAutomatic Repeat Query, so there is an ISSInformation Sending Station in an ARQ link (The station sending information to the recipient). Usually the signal that's longer in duration than the short RQ (Repeat Request) bursts from the IRS. and IRSInformation Receiving Station in an ARQ link (The station receiving information from the ISS. Will send RQ's (Repeat Request) to let the ISS know the information was received successfully. signal for the transmitting station and receiving station.
Samples[edit]
| Military | Diplomatic IRSInformation Receiving Station in an ARQ link (The station receiving information from the ISS. Will send RQ's (Repeat Request) to let the ISS know the information was received successfully. | Diplomatic ISSInformation Sending Station in an ARQ link (The station sending information to the recipient). Usually the signal that's longer in duration than the short RQ (Repeat Request) bursts from the IRS. |
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Frequencies[edit]
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