JT8 is proposed as a possible alternative to JT4. Modulation is 8-FSK at 2.857 baud. FEC uses convolutional codes with K=14, r=1/4, K=15, r=1/6, or K=16, r=1/8, depending on message length. Synchronization uses 8×8 Costas arrays at the beginning and end of a transmission, followed by two additional symbols to distinguish between 30-bit, 48-bit, and 78-bit messages. Total bandwidth is 23 Hz. At present, only the 78-bit messages have been implemented.
http://www.physics.princeton.edu/pulsar/K1JT/WSJT8_User.pdf VE3BDR From: Russell Blair Sent: Wednesday, July 21, 2010 9:46 PM To: Digital Radio Subject: [digitalradio] Question on bandwidth on HF THIS IS NOT TO START A BIG THING...I was using one of the new modes today WSJT8 Beta and was informed that the bandwidth exceeded to limits on HF... My question What is the bandwidth ? Russell NC5O 1- Whoever said nothing is impossible never tried slamming a revolving door! 2- A government big enough to give you everything you want, is strong enough to take everything you have. - Gerald Ford " IN GOD WE TRUST " Russell Blair (NC5O) Skype-Russell.Blair Hell Field #300 DRCC #55 30m Dig-group #693 Digital Mode Club #03198 -------------------------------------------------------------------------------- No virus found in this incoming message. Checked by AVG - www.avg.com Version: 9.0.851 / Virus Database: 271.1.1/3019 - Release Date: 07/21/10 02:36:00
