UHF-Satcom.com - Sicral UHF/SHF/EHF monitoring                                                                             Last update 27/11/2006 15:19:05 -0000

Update 24/11/2006 - Sicral 1A has returned operation on UHF. This occurred sometime in the morning of today. The UHF transponders are looped through at X-band, but no other user traffic has been seen on X-band.

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Update 10/11/2006 - Sicral 1A signals vanished from the slot at 16.2 east! No signals have been detected on either UHF or X-band. The S-band TT&C was located.

Sicral is located at 16 degrees East of South - it's the first Italian satellite developed for defence telecommunications. It's primary users are the Italian navy who make extensive use of the UHF and SHF transponders. This satellite is interesting as it has UHF to SHF cross strapped transponders, which is looped at SHF on the ground, and re-transmitted back down to Earth at UHF. The effect of this is that the delay through the satellite appears to be twice what is expected. Word on the street is that Sicral also carries a 20.7GHz beacon, but to date this has not been detected. Don't forget to check the Sound Samples page for audio from Sicral.


Downlink Freq  Notes Transponder spectrum plot
252.200MHz-252.350MHz Cross strapped with 7393.200MHz-7393.350MHz

UHF uplink + 7100MHz = SHF downlink

258.150MHz-258.300MHz 258.200MHz IDR TBD
267.100MHz-267.250MHz New TPX!! Cross strapped with 7408.100MHz-7408.250MHz

UHF uplink + 7100MHz = SHF downlink

SHF-SatCom frequencies (Sicral).

Downlink Freq Uplink Freq MHz  Notes Transponder spectrum plot
7500.000MHz unknown TT&C Beacon www.uhf-satcom.com
7393.275MHz UHF Relay of UHF 252.275 transponder, looped back up on X, down on UHF. The SICRAL satellite can operate simultaneously on several frequency bands (SHF, EHF and UHF), a characteristics first in Europe, with the possibility to switch the bands on-board of the satellite (first in the world). The UHF satellite repeater is the Europe’s most powerful and the only one to operate inter-connected to the SHF / EHF band.

To the right is the spectrum plot, the thin line on the left is a squeaky wheel up linked via UHF, to the right is the Italian Navy Stanag 4285 traffic / voice traffic.

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7408.200MHz UHF *** NEW UHF TPX 03/09/2006 ***

UHF uplink is retransmitted down from Sicral on 7408.200MHz, looped at the ground station, and retransmitted up to Sicral.Its then transmitted back down on 267.200MHz UHF.

Simplex FM comms and data bursts heard on the X-band downlink, wrapped to a very strong downlink on UHF.

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