Freerunner test
Mike Montour
mail at mmontour.net
Sat May 31 18:22:37 CEST 2008
Kevin Dean wrote:
> I'd like to reconfirm this before reporting, or at least kill my
> theory before reporting on it and creating a false lead. It seems that
> the SIM itself is important.
Two likely factors affecting GSM buzz are: which band it's using (850 or
1900), and the transmitted signal strength (how far it is from the
tower). If you had SIMs from different carriers I could easily see these
factors being different. I can't think of a reason that two SIMs from
the same carrier would differ, except for randomness in which tower it
happened to use.
It looks like one of the 'Engineering Mode' AT commands can at least
report which band you're on and the base-station ID. There is also a
"transmit power" field listed, but when I tested it a minute ago it was
always 0.
http://wiki.openmoko.org/wiki/GTA01_gsm_modem#Serving_Cell_Information_.282.2C1.29
I have a cheap microwave-oven leakage tester from Radio Shack, and I was
able to put that next to my Neo to get a relative indication of its
transmit strength. I could hear the level of the buzz go down at the
same time that the needle on the meter went down.
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