IT9X is an experimental beacon operational in CW,JT65B and BPSK located in JM78LB grid and its 50.057000 Mhz carrier is very accurate with lock to a GPS receiver or a internal backup ovenized stable reference.It is operational 24 hours a day and runs 10 w into a loop antenna with a gain of 4,2 dBd using horizontal polarization.
The beacon has been received in Africa, South America, United States, and in most grid squares in the continental Europe.
Reception reports are welcome ! Email firstname.lastname@example.org
According new 50 – 52 MHz IARU Region 1 bandplan IT9X will qsy to 50.440000 after Italian Telecommunications Authority definitive authorization.
IT9X Transmitting message sequence
|01)||0:00-0:30||(JT65b)||IT9X/B JM78LB Only if GPS fix is valid|
|02)||0.30-1.00||(CW)||VVV IT9X/B JM78LB HHMMz see C)|
|03)||1:00-1:30||(CW)||VVV IT9X/B JM78LB HHMMz|
|04)||1:30-2:00||(BPSK)||Carrier, see B)|
|05)||2:00-2:30||(JT65b)||IT9X/B JM78LB Only if GPS fix is valid|
|06)||2:30-3:00||(CW)||VVV IT9X/B JM78LB HHMMz see C)|
|07)||3:00-3:30||(CW)||VVV IT9X/B 923MASL HHMMz|
|08)||3:30-4:00||(CW)||VVV IT9X/B JM78LB HHMMz|
|09)||4:00-4:30||(JT65b)||IT9X/B JM78LB Only if GPS fix is valid|
|10)||4:30-5:00||(CW)||VVV IT9X/B JM78LB HHMMz see C)|
|11)||5:00-5:30||(CW)||VVV IT9X/B 10WMLOOP HHMMz|
|12)||5:30-6:00||(VAR)||Carrier, see A)|
|> Goto to first block|
HHMMz is the GMT time from GPS
A) Send a RF carrier > 5 sec max power > 5 sec -6 dB power > 5 sec no power > 5 sec -6 dB power > max power to the end of segment.
B) Send a BPSK carrier for 30 sec segment of alternate 1 sec fase +-180 deg from 1 PPPs GPS timing.
C) This line is ignored, except at boot-up and for loss of GPS signal. The first two sequence of group (1 min) are used for JT65B if no gps it send a “923MASL 10WMLOOP” cw message for two segment of 30 sec.
If no gps the carrier 50.057000 MHz use internal reference at +-5 hz max var.
IQ9BW C.I.S.A.R. Messina
and IT9DKJ Frank
G4JNT Andy Talbot
for DDS original base project and firmware.
G3RUH James Miller
for an idea and project to disciple an oscillator with a gps.