Differences

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--- datatrak:signal [2020/05/31 17:31] – [Nav slots] philpem
+++ datatrak:signal [2024/02/21 14:54] (current) – [Operating frequencies] philpem
@@ Line 1: / Line 1: @@
-====== Datatrak signal -- technical details ======
+====== Signal format -- technical details ======
 At the top level, the Datatrak signal consists of //sync data// and a series of time-multiplexed //navigation slots//. Each transmitter is assigned one or more //slots//, which are either //master slots// (the transmitter generates the slot without a reference) or //slave slots// (synchronised to a master slot).
@@ Line 13: / Line 13: @@
 These are the centre frequencies of the two channels used by the UK system.
+==== Current situation ====
+Were a system like Datatrak to be implemented, its operation would be subject to the [[https://www.itu.int/dms_pub/itu-r/opb/reg/R-REG-RR-2020-ZIP-E.zip|ITU Radio Regulations]]. The LF radionavigation allocation closest to Datatrak would be from 70 kHz to 130 kHz.
+The old Datatrak frequencies are currently part of a fixed/maritime mobile allocation without radionavigation specified. Whether this could be re-used is a question better posed to the ITU or a national regulator!