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
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