Category:SWIFT-3k - Revision history

Guest10074: Update wiki page and add download link

2026-09-28T19:37:17Z

Update wiki page and add download link

← Older revision		Revision as of 19:37, 28 September 2026
Line 3:		Line 3:
	'''SWIFT-3k''' (Also known as OFDM) is a 49-tone OFDM PSK Russian military multi-channel modem. It features scrambled voice/ data-communication at a maximum data rate of 7333 bps. Each subcarrier can transmit up to 44.1 Bd.		'''SWIFT-3k''' (Also known as OFDM) is a 49-tone OFDM PSK Russian military multi-channel modem. It features scrambled voice/ data-communication at a maximum data rate of 7333 bps. Each subcarrier can transmit up to 44.1 Bd.

	This waveform is transmitted by the SWIFT-3k~~, SWIFT-3k-2, SWIFT-3k-3~~ and the newer SWIFT-3k-4 modem versions in use by the multiple operators but Guest Radio operator mostly. These modems were designed to have many different devices plugged into them to form the modem’s input – most often teleprinters unique to the different military services and civilian agencies that use them, and also, vocoders and speech encipherment systems, but all are transmitted in the same fashion.		This waveform is transmitted by the SWIFT-3k and the newer SWIFT-3k modem versions in use by the multiple operators but Guest Radio operator mostly. These modems were designed to have many different devices plugged into them to form the modem’s input – most often teleprinters unique to the different military services and civilian agencies that use them, and also, vocoders and speech encipherment systems, but all are transmitted in the same fashion.

	A characteristic trait of this signal is the unmodulated leader tone at 1500 Hz (But some people use different ones).		A characteristic trait of this signal is the unmodulated leader tone at 1500 Hz (But some people use different ones).
Line 42:		Line 42:
	\|-		\|-
	\|Modulation		\|Modulation
	\|DBPSK / DQPSK / D8PSK / D16PSK		\|DBPSK / DQPSK / D8PSK / D16PSK / D16APSK
	\|~~Differential in time~~, ~~so no channel equaliser is needed~~.		\|All differential — D16APSK carries amplitude too, the rest phase only.
	\|-		\|-
	\|FEC		\|FEC
Line 123:		Line 123:
	\|4 707 bit/s		\|4 707 bit/s
	\| +17 dB		\| +17 dB
			\|-
			\|D16APSK + FEC 1/2
			\|7 333 bit/s
			\|3 290 bit/s
			\| +18 dB
			\|-
			\|D16APSK + FEC 3/4
			\|7 333 bit/s
			\|4 707 bit/s
			\| +18 dB
	\|-		\|-
	\|DQPSK raw		\|DQPSK raw
Line 146:		Line 156:

	== How to download and use ==		== How to download and use ==
	~~Ask guest10074 (@guest10074~~.~~lua) on Discord~~. The modem is fully built in HTML so it can be used as a standalone file.		[https://qu.ax/Ypnkm Download here.] The modem is fully built in HTML so it can be used as a standalone file.
	----		----
	[[Category:Modems]]		[[Category:Modems]]

Guest10074: /* Burst structure */

2026-09-25T14:50:23Z

Burst structure

← Older revision		Revision as of 14:50, 25 September 2026
Line 136:		Line 136:

	== Burst structure ==		== Burst structure ==
	~~┌──────────────┬──┬────────┬─┬─────┬──────────┬──────────────┐~~		┌──────────────┬──┬────────┬───┬─────┬──────────┬────────────────┐
	│ leader tone │ │ chirp │ │ ref │ header │ payload │		│ leader tone │ │ chirp │ │ ref │ header │ payload │
	│ 1500 Hz, .6s │30│ 300→ ~~│1│~~ 1 │ 8 sym │ N symbols │		│ 1500 Hz, .6s │30│ 300→ │1 │ 1 │ 8 sym │ N symbols │
	│ │ms│ 2700Hz ~~│0│~~ sym │ DBPSK ×5 │ data mode │		│ │ms│ 2700Hz │0 │ sym │ DBPSK ×5 │ data mode │
	│ │ │ 100 ms ~~│ms│~~ │ │ │ <br />~~└──────────────┴──┴────────┴─┴─────┴──────────┴──────────────┘~~		│ │ │ 100 ms │ms │ │ │ │ <br />└──────────────┴──┴────────┴───┴─────┴──────────┴────────────────┘

	Logs:		Logs:

Sophie-developer: formatting

2026-09-25T10:59:18Z

formatting

← Older revision		Revision as of 10:59, 25 September 2026
Line 1:		Line 1:
	[[File:Obraz.png\|300px\|thumb\|right\|Leader tone -> Traffic burst]]		[[File:Obraz.png\|300px\|thumb\|right\|Leader tone -> Traffic burst]]
	[[File:Obraz_(1).png\|300px\|thumb\|right\|Deeper look into the burst]]		[[File:Obraz_(1).png\|300px\|thumb\|right\|Deeper look into the burst]]
	'''SWIFT-3k''' ~~(made by guest10074)~~ (Also known as OFDM) is a 49-tone OFDM PSK Russian military multi-channel modem. It features scrambled voice/ data-communication at a maximum data rate of 7333 bps. Each subcarrier can transmit up to 44.1 Bd.		'''SWIFT-3k''' (Also known as OFDM) is a 49-tone OFDM PSK Russian military multi-channel modem. It features scrambled voice/ data-communication at a maximum data rate of 7333 bps. Each subcarrier can transmit up to 44.1 Bd.

	This waveform is transmitted by the SWIFT-3k, SWIFT-3k-2, SWIFT-3k-3 and the newer SWIFT-3k-4 modem versions in use by the multiple operators but Guest Radio operator mostly. These modems were designed to have many different devices plugged into them to form the modem’s input – most often teleprinters unique to the different military services and civilian agencies that use them, and also, vocoders and speech encipherment systems, but all are transmitted in the same fashion.		This waveform is transmitted by the SWIFT-3k, SWIFT-3k-2, SWIFT-3k-3 and the newer SWIFT-3k-4 modem versions in use by the multiple operators but Guest Radio operator mostly. These modems were designed to have many different devices plugged into them to form the modem’s input – most often teleprinters unique to the different military services and civilian agencies that use them, and also, vocoders and speech encipherment systems, but all are transmitted in the same fashion.
Line 56:		Line 56:
	\|≈ 2.3 kHz		\|≈ 2.3 kHz
	\|−26 dB points at roughly 350 and 2650 Hz.		\|−26 dB points at roughly 350 and 2650 Hz.
			\|-
			\|Creator
			\|guest10074
			\|
	\|}		\|}

Line 136:		Line 140:
	│ 1500 Hz, .6s │30│ 300→ │1│ 1 │ 8 sym │ N symbols │		│ 1500 Hz, .6s │30│ 300→ │1│ 1 │ 8 sym │ N symbols │
	│ │ms│ 2700Hz │0│ sym │ DBPSK ×5 │ data mode │		│ │ms│ 2700Hz │0│ sym │ DBPSK ×5 │ data mode │
	│ │ │ 100 ms │ms│ │ │ │ <br />		│ │ │ 100 ms │ms│ │ │ │ <br />└──────────────┴──┴────────┴─┴─────┴──────────┴──────────────┘

	Logs:		Logs:
	none yet		none yet

Mukhash at 15:08, 24 September 2026

2026-09-24T15:08:35Z

← Older revision		Revision as of 15:08, 24 September 2026
Line 3:		Line 3:
	'''SWIFT-3k''' (made by guest10074) (Also known as OFDM) is a 49-tone OFDM PSK Russian military multi-channel modem. It features scrambled voice/ data-communication at a maximum data rate of 7333 bps. Each subcarrier can transmit up to 44.1 Bd.		'''SWIFT-3k''' (made by guest10074) (Also known as OFDM) is a 49-tone OFDM PSK Russian military multi-channel modem. It features scrambled voice/ data-communication at a maximum data rate of 7333 bps. Each subcarrier can transmit up to 44.1 Bd.

	This waveform is transmitted by the SWIFT-3k and the newer SWIFT-3k modem versions in use by the multiple operators but Guest Radio operator mostly. These modems were designed to have many different devices plugged into them to form the modem’s input – most often teleprinters unique to the different military services and civilian agencies that use them, and also, vocoders and speech encipherment systems, but all are transmitted in the same fashion.		This waveform is transmitted by the SWIFT-3k, SWIFT-3k-2, SWIFT-3k-3 and the newer SWIFT-3k-4 modem versions in use by the multiple operators but Guest Radio operator mostly. These modems were designed to have many different devices plugged into them to form the modem’s input – most often teleprinters unique to the different military services and civilian agencies that use them, and also, vocoders and speech encipherment systems, but all are transmitted in the same fashion.

	A characteristic trait of this signal is the unmodulated leader tone at 1500 Hz (But some people use different ones).		A characteristic trait of this signal is the unmodulated leader tone at 1500 Hz (But some people use different ones).
Line 131:		Line 131:
	\|}		\|}

			== Burst structure ==
			┌──────────────┬──┬────────┬─┬─────┬──────────┬──────────────┐
			│ leader tone │ │ chirp │ │ ref │ header │ payload │
			│ 1500 Hz, .6s │30│ 300→ │1│ 1 │ 8 sym │ N symbols │
			│ │ms│ 2700Hz │0│ sym │ DBPSK ×5 │ data mode │
			│ │ │ 100 ms │ms│ │ │ │ <br />
	Logs:		Logs:
	none yet		none yet

Guest10074: Update page with new SWIFT-3k update adding variable FEC rates

2026-09-23T20:48:17Z

Update page with new SWIFT-3k update adding variable FEC rates

← Older revision		Revision as of 20:48, 23 September 2026
Line 3:		Line 3:
	'''SWIFT-3k''' (made by guest10074) (Also known as OFDM) is a 49-tone OFDM PSK Russian military multi-channel modem. It features scrambled voice/ data-communication at a maximum data rate of 7333 bps. Each subcarrier can transmit up to 44.1 Bd.		'''SWIFT-3k''' (made by guest10074) (Also known as OFDM) is a 49-tone OFDM PSK Russian military multi-channel modem. It features scrambled voice/ data-communication at a maximum data rate of 7333 bps. Each subcarrier can transmit up to 44.1 Bd.

	This waveform is transmitted by the SWIFT-3k and the newer SWIFT-3k~~-3 modems~~ in use by the multiple operators but Guest Radio operator mostly. These modems were designed to have many different devices plugged into them to form the modem’s input – most often teleprinters unique to the different military services and civilian agencies that use them, and also, vocoders and speech encipherment systems, but all are transmitted in the same fashion.		This waveform is transmitted by the SWIFT-3k and the newer SWIFT-3k modem versions in use by the multiple operators but Guest Radio operator mostly. These modems were designed to have many different devices plugged into them to form the modem’s input – most often teleprinters unique to the different military services and civilian agencies that use them, and also, vocoders and speech encipherment systems, but all are transmitted in the same fashion.

	A characteristic trait of this signal is the unmodulated leader tone at 1500 Hz (But some people use different ones).		A characteristic trait of this signal is the unmodulated leader tone at 1500 Hz (But some people use different ones).
Line 46:		Line 46:
	\|-		\|-
	\|FEC		\|FEC
	\|~~Rate ½,~~ K=7 (171/133)		\|K=7 (171/133), rate ½ / ⅔ / ¾
	\|Soft-decision Viterbi, ~~~5 dB of coding gain~~.		\|Soft-decision Viterbi; ⅔ and ¾ puncture the same mother code, not separate encoders.
	\|-		\|-
	\|Interleaver		\|Interleaver
Line 65:		Line 65:
	!Reliable from		!Reliable from
	\|-		\|-
	\|DBPSK + FEC		\|DBPSK + FEC 1/2
	\|1 833 bit/s		\|1 833 bit/s
	\|~~821~~ bit/s		\|890 bit/s
	\| +4 dB		\| +4 dB
	\|-		\|-
	\|DQPSK + FEC		\|DBPSK + FEC 2/3
			\|1 833 bit/s
			\|1 176 bit/s
			\| +4 dB
			\|-
			\|DBPSK + FEC 3/4
			\|1 833 bit/s
			\|1 317 bit/s
			\| +7 dB
			\|-
			\|DQPSK + FEC 1/2
	\|3 667 bit/s		\|3 667 bit/s
	\|1 ~~700~~ bit/s		\|1 733 bit/s
	\| +4 dB		\| +4 dB
	\|-		\|-
	\|D8PSK + FEC		\|DQPSK + FEC 2/3
			\|3 667 bit/s
			\|2 270 bit/s
			\| +7 dB
			\|-
			\|DQPSK + FEC 3/4
			\|3 667 bit/s
			\|2 534 bit/s
			\| +7 dB
			\|-
			\|D8PSK + FEC 1/2
	\|5 500 bit/s		\|5 500 bit/s
	\|2 ~~571~~ bit/s		\|2 534 bit/s
	\| +9 dB		\| +9 dB
	\|-		\|-
	\|D16PSK + FEC		\|D8PSK + FEC 2/3
			\|5 500 bit/s
			\|3 290 bit/s
			\| +10 dB
			\|-
			\|D8PSK + FEC 3/4
			\|5 500 bit/s
			\|3 660 bit/s
			\| +10 dB
			\|-
			\|D16PSK + FEC 1/2
	\|7 333 bit/s		\|7 333 bit/s
	\|3 290 bit/s		\|3 290 bit/s
			\| +17 dB
			\|-
			\|D16PSK + FEC 3/4
			\|7 333 bit/s
			\|4 707 bit/s
	\| +17 dB		\| +17 dB
	\|-		\|-
	\|DQPSK raw		\|DQPSK raw
	\|3 667 bit/s		\|3 667 bit/s
	\|3 ~~182~~ bit/s		\|3 290 bit/s
	\| +14 dB		\| +14 dB
	\|-		\|-
	\|D8PSK raw		\|D8PSK raw
	\|5 500 bit/s		\|5 500 bit/s
	\|4 ~~841~~ bit/s		\|4 707 bit/s
	\| +26 dB		\| +26 dB
	\|}		\|}

Guest10074: More slight changes

2026-09-23T18:22:55Z

More slight changes

← Older revision		Revision as of 18:22, 23 September 2026
Line 100:		Line 100:
	none yet		none yet

	== How to download ==		== How to download and use ==
	Ask guest10074 (@guest10074.lua) on Discord.		Ask guest10074 (@guest10074.lua) on Discord. The modem is fully built in HTML so it can be used as a standalone file.
	----		----
	[[Category:Modems]]		[[Category:Modems]]

Guest10074: Added "How to download" section

2026-09-23T18:21:38Z

Added "How to download" section

← Older revision		Revision as of 18:21, 23 September 2026
Line 1:		Line 1:
	[[File:Obraz.png\|300px\|thumb\|right\|Leader tone -> Traffic burst]]		[[File:Obraz.png\|300px\|thumb\|right\|Leader tone -> Traffic burst]]
	[[File:Obraz_(1).png\|300px\|thumb\|right\|Deeper look into the burst]]		[[File:Obraz_(1).png\|300px\|thumb\|right\|Deeper look into the burst]]
	'''SWIFT-3k''' (Also known as OFDM~~, Guest's modem~~) is a 49-tone OFDM PSK Russian military multi-channel modem. It features scrambled voice/ data-communication at a maximum data rate of 7333 bps. Each subcarrier can transmit up to 44.1 Bd.		'''SWIFT-3k''' (made by guest10074) (Also known as OFDM) is a 49-tone OFDM PSK Russian military multi-channel modem. It features scrambled voice/ data-communication at a maximum data rate of 7333 bps. Each subcarrier can transmit up to 44.1 Bd.

	This waveform is transmitted by the SWIFT-3k and the newer SWIFT-3k-3 modems in use by the multiple operators but Guest Radio operator mostly. These modems were designed to have many different devices plugged into them to form the modem’s input – most often teleprinters unique to the different military services and civilian agencies that use them, and also, vocoders and speech encipherment systems, but all are transmitted in the same fashion.		This waveform is transmitted by the SWIFT-3k and the newer SWIFT-3k-3 modems in use by the multiple operators but Guest Radio operator mostly. These modems were designed to have many different devices plugged into them to form the modem’s input – most often teleprinters unique to the different military services and civilian agencies that use them, and also, vocoders and speech encipherment systems, but all are transmitted in the same fashion.
Line 100:		Line 100:
	none yet		none yet

			== How to download ==
			Ask guest10074 (@guest10074.lua) on Discord.
	----		----
	[[Category:Modems]]		[[Category:Modems]]

Mukhash at 18:18, 23 September 2026

2026-09-23T18:18:52Z

← Older revision		Revision as of 18:18, 23 September 2026
Line 1:		Line 1:
	[[File:~~CIS-12~~.png\|300px\|thumb\|right\|~~Idle/Stand-by~~ -> Traffic burst]]		[[File:Obraz.png\|300px\|thumb\|right\|Leader tone -> Traffic burst]]
			[[File:Obraz_(1).png\|300px\|thumb\|right\|Deeper look into the burst]]
	'''SWIFT-3k''' (Also known as OFDM, Guest's modem) is a 49-tone OFDM PSK Russian military multi-channel modem. It features scrambled voice/ data-communication at a maximum data rate of 7333 bps. Each subcarrier can transmit up to 44.1 Bd.		'''SWIFT-3k''' (Also known as OFDM, Guest's modem) is a 49-tone OFDM PSK Russian military multi-channel modem. It features scrambled voice/ data-communication at a maximum data rate of 7333 bps. Each subcarrier can transmit up to 44.1 Bd.

Mukhash at 18:09, 23 September 2026

2026-09-23T18:09:24Z

← Older revision		Revision as of 18:09, 23 September 2026
Line 5:		Line 5:

	A characteristic trait of this signal is the unmodulated leader tone at 1500 Hz (But some people use different ones).		A characteristic trait of this signal is the unmodulated leader tone at 1500 Hz (But some people use different ones).

			== Air interface ==
			{\| class="wikitable"
			!Parameter
			!Value
			!Why
			\|-
			\|Sample rate
			\|48 000 Hz
			\|Native rate of nearly every sound device.
			\|-
			\|FFT size / spacing
			\|1024 → 46.875 Hz
			\|Symbol long enough for HF Doppler, short enough to track drift.
			\|-
			\|Guard interval
			\|64 / 128 / 256 samples
			\|Fast / Standard / Robust — trades throughput for tolerance of path delay spread and timing error.
			\|-
			\|Symbol rate
			\|44.1 / 41.7 / 37.5 baud
			\|Not signalled — the receiver identifies it from the reference symbol's own guard interval before reading anything else.
			\|-
			\|Carriers
			\|49 (375–2625 Hz)
			\|Fits a 300–2700 Hz SSB filter with room at both edges.
			\|-
			\|Pilots
			\|5 at −24, −12, 0, +12, +24
			\|Carry a known zero phase step; drive the phase loop.
			\|-
			\|Data carriers
			\|44
			\|Everything else.
			\|-
			\|Modulation
			\|DBPSK / DQPSK / D8PSK / D16PSK
			\|Differential in time, so no channel equaliser is needed.
			\|-
			\|FEC
			\|Rate ½, K=7 (171/133)
			\|Soft-decision Viterbi, ~5 dB of coding gain.
			\|-
			\|Interleaver
			\|Coprime stride, per block
			\|Spreads a 2 kB block over up to 9 s of air time.
			\|-
			\|Occupied bandwidth
			\|≈ 2.3 kHz
			\|−26 dB points at roughly 350 and 2650 Hz.
			\|}

			== Throughput ==
			{\| class="wikitable"
			!Mode
			!Gross
			!Net payload
			!Reliable from
			\|-
			\|DBPSK + FEC
			\|1 833 bit/s
			\|821 bit/s
			\| +4 dB
			\|-
			\|DQPSK + FEC
			\|3 667 bit/s
			\|1 700 bit/s
			\| +4 dB
			\|-
			\|D8PSK + FEC
			\|5 500 bit/s
			\|2 571 bit/s
			\| +9 dB
			\|-
			\|D16PSK + FEC
			\|7 333 bit/s
			\|3 290 bit/s
			\| +17 dB
			\|-
			\|DQPSK raw
			\|3 667 bit/s
			\|3 182 bit/s
			\| +14 dB
			\|-
			\|D8PSK raw
			\|5 500 bit/s
			\|4 841 bit/s
			\| +26 dB
			\|}

Mukhash: Created page with "Idle/Stand-by -> Traffic burst '''SWIFT-3k''' (Also known as OFDM, Guest's modem) is a 49-tone OFDM PSK Russian military multi-channel modem. It features scrambled voice/ data-communication at a maximum data rate of 7333 bps. Each subcarrier can transmit up to 44.1 Bd. This waveform is transmitted by the SWIFT-3k and the newer SWIFT-3k-3 modems in use by the multiple operators but Guest Radio operator mostly. These modems were desi..."

2026-09-23T18:08:52Z

Created page with "300px|thumb|right|Idle/Stand-by -> Traffic burst '''SWIFT-3k''' (Also known as OFDM, Guest's modem) is a 49-tone OFDM PSK Russian military multi-channel modem. It features scrambled voice/ data-communication at a maximum data rate of 7333 bps. Each subcarrier can transmit up to 44.1 Bd. This waveform is transmitted by the SWIFT-3k and the newer SWIFT-3k-3 modems in use by the multiple operators but Guest Radio operator mostly. These modems were desi..."

New page

[[File:CIS-12.png|300px|thumb|right|Idle/Stand-by -> Traffic burst]]
'''SWIFT-3k''' (Also known as OFDM, Guest's modem) is a 49-tone OFDM PSK Russian military multi-channel modem. It features scrambled voice/ data-communication at a maximum data rate of 7333 bps. Each subcarrier can transmit up to 44.1 Bd.

This waveform is transmitted by the SWIFT-3k and the newer SWIFT-3k-3 modems in use by the multiple operators but Guest Radio operator mostly. These modems were designed to have many different devices plugged into them to form the modem’s input – most often teleprinters unique to the different military services and civilian agencies that use them, and also, vocoders and speech encipherment systems, but all are transmitted in the same fashion.

A characteristic trait of this signal is the unmodulated leader tone at 1500 Hz (But some people use different ones).

Logs:
none yet

----
[[Category:Modems]]