[Openbts-discuss] camping with 52MHz clock

[Tomas K. <de...@vo...>]

I have been testing with new external 52MHz clock but I'm stucked
exactly with the issue described by Alexander below. I have 3x Siemens
MT50 and one CF62 which connect mostly
on the first try when scanning networks. It scan sometimes OpenBTS +
real networks and sometimes either OpenBTS or real networks. Newer
phones cannot see both in every case I did
and I have to scan many times to reach OpenBTS. I feel there is still
big offset. Is it supposed to happen with the external 52MHz clock or
did I a mistake somewhere ?

Is it possible to reduce the offset with e.g. kal-0.2 ? (My
configuration was gnuradio 3.1.3 & openbts-2.5)

Thanks,
Tomas

> This may be due to clock offset / unstable clock issue.
> When I set clock to ~400-500Hz offset, phones can't connect to
> OpenBTS reliably. Old Siemens and Nokia phones do this pretty
> easily, but newer ones do not and you have to try many times.
>
>