GTA02 grave problems on high speed trains

joerg Reisenweber joerg at
Wed Jul 24 14:53:26 CEST 2013

On Wed 24 July 2013 12:25:07 francesco.devita at wrote:
> Hello
> My GTA02 has a really strange (and frustrating) behaviour 
> [...]
> I suspect that the primary cause is the gsm modem... 
> [...]
> What do you think?
> Regards
> Joif

do you have recent GSM-modem-firmware?
Also see the notorious #1024 bug that may only get fixed in HW but should have 
proper workaround in every existing OS for Freerunner.

Other than that, I don't see any vector how poor reception (the only relevant 
common denominator parameter of the situations where you encounter those 
problems) could have *any* impact on the long list of problems you listed. For 
sure device shall not freeze or encounter IO-errors, no matter what's 
happening to modem.

Ooh, wait! In poor-signal conditions the modem also needs to use high TX 
power. This *could* theoreticaly have impact on whole system when the battery 
is very old and worn and thus has high ESR thus creating "brownouts" for whole 
system when modem drives its surges of power consumption to the battery. So 
maybe swapping battery for a fresh cell (Nokia one, for test purposes. See 
) might be worth a try.

good luck

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