FT8 - Revision history

Onnowpurbo at 09:17, 12 June 2021

2021-06-12T09:17:57Z

← Older revision		Revision as of 09:17, 12 June 2021
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	* http://ae5x.blogspot.com/2019/08/using-bot-for-full-auto-ft8.html		* http://ae5x.blogspot.com/2019/08/using-bot-for-full-auto-ft8.html
	* https://sourceforge.net/projects/wsjt-z/files/Packages/		* https://sourceforge.net/projects/wsjt-z/files/Packages/



			==Pranala Menarik==

			* [[FT8: Automatic]]

Onnowpurbo at 01:16, 7 June 2021

2021-06-07T01:16:46Z

← Older revision		Revision as of 01:16, 7 June 2021
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	Compared to the so-called "slow modes" (JT9, JT65, QRA64), FT8 is a few decibels less sensitive, but allows completion of QSOs four times faster. Bandwidth is greater than JT9, but about one-quarter of JT65A and less than one-half of QRA64. Compared with the "fast modes" (JT9E-H), FT8 is significantly more sensitive, has much narrower bandwidth, uses the vertical waterfall, and offers multi-decoding over the full displayed passband. Features not yet implemented include signal subtraction, two-pass decoding, and use of a priori (already known) information as it accumulates during a QSO."[15]		Compared to the so-called "slow modes" (JT9, JT65, QRA64), FT8 is a few decibels less sensitive, but allows completion of QSOs four times faster. Bandwidth is greater than JT9, but about one-quarter of JT65A and less than one-half of QRA64. Compared with the "fast modes" (JT9E-H), FT8 is significantly more sensitive, has much narrower bandwidth, uses the vertical waterfall, and offers multi-decoding over the full displayed passband. Features not yet implemented include signal subtraction, two-pass decoding, and use of a priori (already known) information as it accumulates during a QSO."[15]

			==Referensi==

			* https://en.wikipedia.org/wiki/WSJT_(amateur_radio_software)

Onnowpurbo at 01:16, 7 June 2021

2021-06-07T01:16:20Z

← Older revision		Revision as of 01:16, 7 June 2021
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	Unlike JT65 or JT9, transmit and receive cycles in FT8 each last about 15 seconds. ... Like JT65, FT8 requires accurate time synchronization. An auto-sequencing feature offers the option to respond automatically to the first decoded reply to your CQ.		Unlike JT65 or JT9, transmit and receive cycles in FT8 each last about 15 seconds. ... Like JT65, FT8 requires accurate time synchronization. An auto-sequencing feature offers the option to respond automatically to the first decoded reply to your CQ.


			Joe Taylor, K1JT, announced on June 29, 2017 the availability of a new mode in the WSJT-X software, FT8.[14] FT8 stands for "Franke-Taylor design, 8-FSK modulation" and was created by Joe Taylor, K1JT and Steve Franke, K9AN. It is described as being designed for "multi-hop Es where signals may be weak and fading, openings may be short, and you want fast completion of reliable, confirmable QSO's".

			According to Taylor, the important characteristics of FT8 are —

			T/R sequence length: 15 s
			Message length: 75 bits + 12-bit CRC
			FEC code: (174,87) LDPC
			Modulation: 8-FSK, keying rate = tone spacing = 6.25 Hz
			Waveform: Continuous phase, constant envelope
			Occupied bandwidth: 50 Hz
			Synchronization: three 7x7 Costas arrays (start, middle, end of transmission)
			Transmission duration: 79*1920/12000 = 12.64 s
			Decoding threshold: -20 dB (perhaps -24 dB with a priori decoding, TBD)
			Operational behavior: similar to HF usage of JT9, JT65
			Multi-decoder: finds and decodes all FT8 signals in passband
			Auto-sequencing after manual start of QSO
			Compared to the so-called "slow modes" (JT9, JT65, QRA64), FT8 is a few decibels less sensitive, but allows completion of QSOs four times faster. Bandwidth is greater than JT9, but about one-quarter of JT65A and less than one-half of QRA64. Compared with the "fast modes" (JT9E-H), FT8 is significantly more sensitive, has much narrower bandwidth, uses the vertical waterfall, and offers multi-decoding over the full displayed passband. Features not yet implemented include signal subtraction, two-pass decoding, and use of a priori (already known) information as it accumulates during a QSO."[15]

Onnowpurbo: /* Automatic Mode */

2021-06-07T01:14:56Z

Automatic Mode

← Older revision		Revision as of 01:14, 7 June 2021
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	* http://ae5x.blogspot.com/2019/08/using-bot-for-full-auto-ft8.html		* http://ae5x.blogspot.com/2019/08/using-bot-for-full-auto-ft8.html
			* https://sourceforge.net/projects/wsjt-z/files/Packages/

Onnowpurbo: Created page with "Unlike JT65 or JT9, transmit and receive cycles in FT8 each last about 15 seconds. ... Like JT65, FT8 requires accurate time synchronization. An auto-sequencing feature offers..."

2021-06-07T01:11:47Z

Created page with "Unlike JT65 or JT9, transmit and receive cycles in FT8 each last about 15 seconds. ... Like JT65, FT8 requires accurate time synchronization. An auto-sequencing feature offers..."

New page

Unlike JT65 or JT9, transmit and receive cycles in FT8 each last about 15 seconds. ... Like JT65, FT8 requires accurate time synchronization. An auto-sequencing feature offers the option to respond automatically to the first decoded reply to your CQ.

==Automatic Mode==

* http://ae5x.blogspot.com/2019/08/using-bot-for-full-auto-ft8.html