JT65 - banburyares.co.uk · JT65 • JT65 is a sent as a set of 65 tones (frequencies) • Designed...
Transcript of JT65 - banburyares.co.uk · JT65 • JT65 is a sent as a set of 65 tones (frequencies) • Designed...
![Page 1: JT65 - banburyares.co.uk · JT65 • JT65 is a sent as a set of 65 tones (frequencies) • Designed for EME (Earth-Moon-Earth) weak signal comms • Very brief QSOs, special code](https://reader033.fdocuments.in/reader033/viewer/2022041520/5e2d98e8f0e7ff01bb697ab5/html5/thumbnails/1.jpg)
![Page 2: JT65 - banburyares.co.uk · JT65 • JT65 is a sent as a set of 65 tones (frequencies) • Designed for EME (Earth-Moon-Earth) weak signal comms • Very brief QSOs, special code](https://reader033.fdocuments.in/reader033/viewer/2022041520/5e2d98e8f0e7ff01bb697ab5/html5/thumbnails/2.jpg)
JT65 Digital Mode
Antony M0IFA
![Page 3: JT65 - banburyares.co.uk · JT65 • JT65 is a sent as a set of 65 tones (frequencies) • Designed for EME (Earth-Moon-Earth) weak signal comms • Very brief QSOs, special code](https://reader033.fdocuments.in/reader033/viewer/2022041520/5e2d98e8f0e7ff01bb697ab5/html5/thumbnails/3.jpg)
JT65• JT65 is a sent as a set of 65 tones (frequencies)
• Designed for EME (Earth-Moon-Earth) weak signal comms
• Very brief QSOs, special code messages, 63 symbols
• Plus plain text messages with max 13 characters
![Page 4: JT65 - banburyares.co.uk · JT65 • JT65 is a sent as a set of 65 tones (frequencies) • Designed for EME (Earth-Moon-Earth) weak signal comms • Very brief QSOs, special code](https://reader033.fdocuments.in/reader033/viewer/2022041520/5e2d98e8f0e7ff01bb697ab5/html5/thumbnails/4.jpg)
Signals• 65 spot frequencies
• Audio out, USB, - 1270.5 Hz Sync and 63 message symbols at +2.69Hz x (n+2)
• 126 time intervals of 327ms Msg takes up to 47.8s
• Start ALWAYS 0 to1sec after UTC minute
Sync0 Msg2-65
47.8s
Tim
e
Freq
![Page 5: JT65 - banburyares.co.uk · JT65 • JT65 is a sent as a set of 65 tones (frequencies) • Designed for EME (Earth-Moon-Earth) weak signal comms • Very brief QSOs, special code](https://reader033.fdocuments.in/reader033/viewer/2022041520/5e2d98e8f0e7ff01bb697ab5/html5/thumbnails/5.jpg)
Coding• Uses ASCII input (UC + 0-9)
• Message compressed and error correction bits added - Using Reed-Solomon algorithm (as on CDROMs, HDD..)
• Pseudo-random Sync Vector interspersed
• Total sent is 126 symbols (63 msg + 63 sync)
![Page 6: JT65 - banburyares.co.uk · JT65 • JT65 is a sent as a set of 65 tones (frequencies) • Designed for EME (Earth-Moon-Earth) weak signal comms • Very brief QSOs, special code](https://reader033.fdocuments.in/reader033/viewer/2022041520/5e2d98e8f0e7ff01bb697ab5/html5/thumbnails/6.jpg)
WSJT-X Rx
![Page 7: JT65 - banburyares.co.uk · JT65 • JT65 is a sent as a set of 65 tones (frequencies) • Designed for EME (Earth-Moon-Earth) weak signal comms • Very brief QSOs, special code](https://reader033.fdocuments.in/reader033/viewer/2022041520/5e2d98e8f0e7ff01bb697ab5/html5/thumbnails/7.jpg)
JT65-HF Rx
![Page 8: JT65 - banburyares.co.uk · JT65 • JT65 is a sent as a set of 65 tones (frequencies) • Designed for EME (Earth-Moon-Earth) weak signal comms • Very brief QSOs, special code](https://reader033.fdocuments.in/reader033/viewer/2022041520/5e2d98e8f0e7ff01bb697ab5/html5/thumbnails/8.jpg)
Arduino &
AD9850 Tx
![Page 9: JT65 - banburyares.co.uk · JT65 • JT65 is a sent as a set of 65 tones (frequencies) • Designed for EME (Earth-Moon-Earth) weak signal comms • Very brief QSOs, special code](https://reader033.fdocuments.in/reader033/viewer/2022041520/5e2d98e8f0e7ff01bb697ab5/html5/thumbnails/9.jpg)
The AD9850 module
Control signals- D7 DATA - WCLK - FQUP - REST
RF out
125MHz xtal
![Page 10: JT65 - banburyares.co.uk · JT65 • JT65 is a sent as a set of 65 tones (frequencies) • Designed for EME (Earth-Moon-Earth) weak signal comms • Very brief QSOs, special code](https://reader033.fdocuments.in/reader033/viewer/2022041520/5e2d98e8f0e7ff01bb697ab5/html5/thumbnails/10.jpg)
Transmit
• PC running Arduino ID - Serial Monitor window
• Arduino UNO running JT65_ADS_TEXT sketch
• RTC for accurate timeCalibrated usingRTC_SET sketch
• AD9850 generatingRF output
![Page 11: JT65 - banburyares.co.uk · JT65 • JT65 is a sent as a set of 65 tones (frequencies) • Designed for EME (Earth-Moon-Earth) weak signal comms • Very brief QSOs, special code](https://reader033.fdocuments.in/reader033/viewer/2022041520/5e2d98e8f0e7ff01bb697ab5/html5/thumbnails/11.jpg)
Receiver
• Arduino runningSDR_ELEKTOR sketch
• Elektor SDR shield • Analog-Digital Audio
convertor • MacBook running
HDSDR and JT65-HF
![Page 12: JT65 - banburyares.co.uk · JT65 • JT65 is a sent as a set of 65 tones (frequencies) • Designed for EME (Earth-Moon-Earth) weak signal comms • Very brief QSOs, special code](https://reader033.fdocuments.in/reader033/viewer/2022041520/5e2d98e8f0e7ff01bb697ab5/html5/thumbnails/12.jpg)
AD9850 TXWaiting for minute Sending message
Enter msg on PC
Display on LCD
Wait for minute Send on Freq
![Page 13: JT65 - banburyares.co.uk · JT65 • JT65 is a sent as a set of 65 tones (frequencies) • Designed for EME (Earth-Moon-Earth) weak signal comms • Very brief QSOs, special code](https://reader033.fdocuments.in/reader033/viewer/2022041520/5e2d98e8f0e7ff01bb697ab5/html5/thumbnails/13.jpg)
HDSDRElektor SDR
centre frequency set to 7100kHz
Loopback audio to JT65-HF
JT65 TX 7076000 RX Dial 7074830
![Page 14: JT65 - banburyares.co.uk · JT65 • JT65 is a sent as a set of 65 tones (frequencies) • Designed for EME (Earth-Moon-Earth) weak signal comms • Very brief QSOs, special code](https://reader033.fdocuments.in/reader033/viewer/2022041520/5e2d98e8f0e7ff01bb697ab5/html5/thumbnails/14.jpg)
JT65-HF RX
![Page 15: JT65 - banburyares.co.uk · JT65 • JT65 is a sent as a set of 65 tones (frequencies) • Designed for EME (Earth-Moon-Earth) weak signal comms • Very brief QSOs, special code](https://reader033.fdocuments.in/reader033/viewer/2022041520/5e2d98e8f0e7ff01bb697ab5/html5/thumbnails/15.jpg)
Elektor SDR
AD9850 & RTC
RF Meter
![Page 16: JT65 - banburyares.co.uk · JT65 • JT65 is a sent as a set of 65 tones (frequencies) • Designed for EME (Earth-Moon-Earth) weak signal comms • Very brief QSOs, special code](https://reader033.fdocuments.in/reader033/viewer/2022041520/5e2d98e8f0e7ff01bb697ab5/html5/thumbnails/16.jpg)
Demo hopefully
SDR VFO/JT65 RF METER
![Page 17: JT65 - banburyares.co.uk · JT65 • JT65 is a sent as a set of 65 tones (frequencies) • Designed for EME (Earth-Moon-Earth) weak signal comms • Very brief QSOs, special code](https://reader033.fdocuments.in/reader033/viewer/2022041520/5e2d98e8f0e7ff01bb697ab5/html5/thumbnails/17.jpg)