Re: [Openbts-discuss] kal works, openbts using 64Mhz clocktamer nearly, 52Mhz not at all

[Alexander C. <ale...@gm...>]

Thomas,

Do you configure OpenBTS-uhd with --with-usrp1 option?

On Sat, Jul 30, 2011 at 13:30, Thomas Schroedinger
<t.s...@ya...> wrote:
> Hello list,
>
> I'm writing this mail to ask some questions regarding openbts-uhd. I run
> openbts-2.6 natively on an ubuntu Linux 11.04.
>
> My hardware is an USRP1 with a clocktamer and one RFX 900 board.
> lsusrp
> USRP 0 serial number 4cfc7fee
>   RX d'board A: Flex 900 Rx MIMO B
>   RX d'board B: <none>
>   TX d'board A: Flex 900 Tx MIMO B
>   TX d'board B: <none>
>
>
> I applied the patch described in [0] to OpenBTS-udh and didn't patch
> gnuradio as written in the docu.
>
> The clock seems to be working correctly using kal, here what I did:
>     ./kal -s 900 -R 0 -A 1
>
> FPGA clock : 52000000
> Decimation : 192
> Sample rate: 270833.343750
> kal: Scanning for GSM-900 base stations.
> calculate power in each channel:
> channel detect threshold: 476.908095
> GSM-900:
>         chan: 121 (959.2MHz -  35Hz)    power: 1615.64
>     ./kal -vvv -c 121 -R 0 -A 1
> and I did the finetuning of my clocktamer until I found settings giving
> me 20-30 Hz average as described in [1]. Here the commands I gave to
> tamer-spi:
>     SET,,OUT,52000002
>     SET,,OSC,19999993
> Now, when I scan for networks using my mobiles I don't find my basestation (nokia e71,
> motorola c123) using the openbts settings of [2].
> When I set my clock to 64Mhz and I modify my OpenBTS.config
> (modified Transceiver52M) I can see my BTS (testNet or 00101), but when I try to register it fails.
>
> Do you have any hint what I can try next? I'm really somehow lost and
> tried so much already. I provided some logs under [3].
>
> With best regards,
> Thomas
>
> [0]: http://sourceforge.net/mailarchive/message.php?msg_id=26618689
> [1]: http://code.google.com/p/clock-tamer/wiki/ClockTamerCalibration
> [2]: http://pastebin.com/JyduHcdJ
> [3]: http://pastebin.com/Az2QKMrV
>
>
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-- 
Regards,
Alexander Chemeris.