IT9X 6m beacon

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

According new 50 – 52 MHz IARU Region 1 bandplan IT9X will qsy to 50.440000 after Italian Telecommunications Authority definitive authorization.

New 50 – 52 MHz IARU Region 1 bandplan (Italian file pdf)  (courtesy
IARU Region 1 VHF/UHF/Microvave bandplan




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
Transmitting info

HHMMz is the GMT time from GPS
If non valid GPS data at the end of a CW message it append a “NOGPS”
If no supply from Ac source at the end of a CW message it append a “ACLOSS”

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.
The output carrier 50.057000 MHz is locked to a gps reference of +-0,1 hz max var.

If no gps the carrier 50.057000 MHz use internal reference at +-5 hz max var.

Special thanks
IQ9BW C.I.S.A.R. Messina

and IT9DKJ Frank

JM78 VHF DX Group
IT9IPQ Paul – IT9OBK Mel – IT9TYR Tony – IT9CXA Joe

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.


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