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--- guides:ublox_psm [2012/11/14 16:14] – upu
+++ guides:ublox_psm [2012/12/17 14:59] (current) – Updated with findings from this weekends testing upu
@@ Line 9: / Line 9: @@
 ===== Cyclic Mode =====
-This mode is available on all models of the ublox6 family though the maximum update period can vary. When the GPS starts up it is by default in  the //Maximum Performance// mode. You can only set the power saving mode once the GPS has got a lock otherwise the module has a habit of reseting itself and losing all your settings. Once you have switched from //Max Perfom// to //Power Saving// the default setting is cyclic with  an update period of 1 second resulting in a draw on average (for the 3.3v module) of 14mA-15mA. On the modules with the TCXO* this can be extended to an update period of 10 seconds which reduces the current draw average to 10mA.
+This mode is available on all models of the ublox6 family though the update period can, in theory, vary. When the GPS starts up it is by default in  the //Maximum Performance// mode. Once you have switched from //Max Perfom// to //Power Saving// the default setting is cyclic with  an update period of 1 second resulting in a draw on average (for the 3.3v module) of 14mA-15mA.
+On the modules with the TCXO* this can according to the data sheet be extended to an update period of 10 seconds which reduces the current draw average to 10mA. However under testing by Anthony Stirk stable performance with anything other than the default cyclic of 1 second was not achievable.
+Additionally :
+  * You can only set the power saving mode once the GPS has got a lock otherwise the module has a habit of reseting itself and losing all your settings.
+  * Setting power saving with the module that has a lock with only 4 satellites can lead to unstable performance. Its advise you only engage power saving mode when you have more than 5 satellites.
+  * When setting the power saving on have a small delay (~1000ms) in code before proceeding with further settings.
 * The NEO-6M module doesn't have a TCXO so cannot do 10 second cyclic (it can do 1 second though).