Mobile phone to act as RF frequency sesnor and detector

Winston Ojenge wojenge at strathmore.edu
Fri Apr 20 08:08:21 UTC 2012


Hi Andreas.
Much appreciation, but one more question. Can OsmocomBB code recognize
any other signals which are non-GSM in the neighborhood of the c123,
for instance, signals generated by radio/TV receivers? How can it be
made to recognize them?

Ojenge

On 4/20/12, Winston Ojenge <wojenge at strathmore.edu> wrote:
> Hi Andreas,
> Much appreciation. I have to do it as long as it's possible. Thanks.
> Will update forum on my results progress.
> Ojenge
>
> On 4/19/12, Andreas Eversberg <andreas at eversberg.eu> wrote:
>> hi ojenge,
>>
>> you need to perform two steps:
>>
>> 1. you need to alter the neighbour cell measurement task in
>> mobile/gsm322.c, so it will not measure neighbour cells in idle mode,
>> but measure whatever you like. you can define up to 32 frequencies.
>> after you've received the results, you can keep them, change them or
>> change them back to start over, until you have measured the full range
>> you want. you must give <ARFCN> + ARFCN_UPLINK in order to measure other
>> phones.
>>
>> 2. as you have a complete set of frequencies you wanted to scan, you
>> need to generate an sms with these results.
>>
>> note that you cannot sync nor read any messages from the surrounding
>> phones with the neighbour cell measurement task. you just get the rx
>> level of what passes through the filters.
>>
>> also note that the current code will only run on a host, so you need a
>> laptop/netbook/embedded hardware to use the c123 with osmocombb.
>>
>> i suggest start reading the gsm322.c, it does most of the idle process.
>>
>> regards,
>>
>> andreas
>>
>>
>




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