sylvain/testing BTS and tx power

Hi,

I tried to use code from sylvain/testing and from sylvain/burst_ind braches to send different bursts
directly from one ms to another. On freq from GSM900 band that works fine. When I set freq in GSM1800 band I
can see the same bursts, but with very small rx_level(drop to 15 from 60).
I tried to change l1s.tx_power for l1s_tx_apc_helper, but that does not help. Perhaps dsp patch block tx
power configuration or something else? Any idea how to fix that?

Best regards,
Anton

Re: sylvain/testing BTS and tx power

Hi,

> I tried to use code from sylvain/testing and from sylvain/burst_ind braches to send different bursts
directly from one ms to another. On freq from GSM900 band that works fine. When I set freq in GSM1800 band I
can see the same bursts, but with very small rx_level(drop to 15 from 60).
> I tried to change l1s.tx_power for l1s_tx_apc_helper, but that does not help. Perhaps dsp patch block tx
power configuration or something else? Any idea how to fix that?

There is nothing band specific in those patches.

The frequency duplex separation in 1800 is larger, meaning we operate
the PLL much more out of spec in 1800 which might yield the result
you're seeing.

Are you TXing in the DL band or RXing in the UL band ?

Cheers,

    Sylvain

Re: sylvain/testing BTS and tx power

Thanks for quick answer,

I make TX/RX on uplink band. I make code based on prim_bts.c so I use following code for normal burst sending:

        dsp_api.db_w->d_task_ra = RACH_DSP_TASK;
        /* Open TX window */
        l1s_tx_apc_helper(arfcn);
        l1s_tx_win_ctrl(arfcn | ARFCN_UPLINK, L1_TXWIN_NB, 0, 3+timeslot);
        return 0;
}

How I can make results for 1800 band more accurate?

Best regards,
Anton

25.09.2014, 19:27, "Sylvain Munaut" <246tnt@gmail.com>:
>  Hi,
>>   I tried to use code from sylvain/testing and from sylvain/burst_ind braches to send different
bursts directly from one ms to another. On freq from GSM900 band that works fine. When I set freq in GSM1800
band I can see the same bursts, but with very small rx_level(drop to 15 from 60).
>>   I tried to change l1s.tx_power for l1s_tx_apc_helper, but that does not help. Perhaps dsp patch
block tx power configuration or something else? Any idea how to fix that?
>  There is nothing band specific in those patches.
>
>  The frequency duplex separation in 1800 is larger, meaning we operate
>  the PLL much more out of spec in 1800 which might yield the result
>  you're seeing.
>
>  Are you TXing in the DL band or RXing in the UL band ?