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2018 July RCARS Intro to Operating FT8 Mode
1. Intro to FT8 Digital Mode
Kevin Hooke KK6DCT
July 2018
2. Intro to FT8: Summary
FT8 Mode – what is it?
FT8 vs other digital modes
JT65 recap
What do you need to operate FT8?
Alternative approaches to operate (where is my radio?!)
What do JT65 vs FT8 signals look like / sound like?
Demos:
Receiving FT8 using a WebSDR
FT8 QSOs via a remote rig (remotehamradio.com)
3. FT8 Mode – what is it?
Latest digital mode from Steven Franke K9AN and Joe Taylor K1JT
“The numeral (8) designates the mode’s 8-frequency shift keying format”
From http://www.arrl.org/news/ft8-mode-is-latest-bright-shiny-object-in-amateur-radio-digital-world
“FT8 is operationally similar to JT65 but is much faster, using T/R cycles only 15 s
long”
From https://physics.princeton.edu/pulsar/k1jt/wsjtx.html
FT8
4. FT8 vs JT9, JT65, PSK31, RTTY etc
What’s different between FT8 and all the other digital modes?
Dave Casler KE0OG, YouTube episode #104
Describes 3 generations of digital modes:
1
st
Generation: RTTY, Packet, PACTOR, AMTOR
2
nd
Generation: PSK31 (and others)
- 3khz – multiple QSOs in parallel
3
rd
Generation: WSJT-X software: JT65, JT9, FT8 (and others)
- weak signal modes
- software receives signals barely audible to the ear
- error checking, redundancy
6. What do you need to operate FT8?
SSB transceiver (FT8 uses USB)
A computer
WSJT-X software: https://physics.princeton.edu/pulsar/k1jt/wsjtx.html
- Windows
- Mac OS
- Linux
Depending on your radio, either a soundcard interface or USB
(see previous JT65 presentation on soundcard interfaces)
7. What do you need to operate FT8?
Alternative approaches
WebSDR
– receive audio online
- pipe audio to WSJT-X with
- VB-Cable (Windows)
- Soundflower (free, MacOS)
https://github.com/mattingalls/Soundflower
- Rogue Amoeba Loopback ($99, MacOS)
https://rogueamoeba.com/loopback/
RemoteHamRadio.com
- remote station operation over the internet
- operate station remotely
- run WSJT-X locally, pipe audio to remote
transceiver (with virtual audio cables)
8. How is FT8 different from JT65?
Typical JT65 QSO
exchange:
9. How is FT8 different from JT65?
Typical FT8 QSO
exchange:
10. How is FT8 different from JT65?
Time for JT65
QSO:
7 minutes
11. How is FT8 different from JT65?
Typical FT8 QSO
exchange:
1.5 minutes!