Hi Yavuz, Try to use achemeris/umtrx-fixes branch for osmo-trx. Also check that you use the latest version of UHD from https://github.com/fairwaves/UHD-Fairwave
If you have old version of FPGA and ZPU, flash current FPGA and ZPU images: http://umtrx.org/hardware/flashing/ 18 сент. 2014 г. 21:49 пользователь "Arif" <[email protected]> написал: > Yavuz Mert <yavuzmertt <at> gmail.com> writes: > > > > > Hi, > > I have a problem setting tx power in osmo-trx. I debugged and found > that > > correct gain value is passed to uhd_device::setTxGain. But whatever > value is > > set to usrp_dev->set_tx_gain, usrp_dev->get_tx_gain(chan) returns -28 > db. > > In uhd_device::setTxGain(double db, size_t chan) I put a printf to > see > > values. > > > > usrp_dev->set_tx_gain(db, chan); > > tx_gains[chan] = usrp_dev->get_tx_gain(chan); > > printf("Written %f, read %f\n", > db,tx_gains[chan]);fflush(stdout); > > > > Written 21.000000, read -28.000000 > > Written 11.000000, read -28.000000 > > Written -35.000000, read -28.000000 > > > > But despite the read values, actually the power is somewhat changed. I > plugged > > TX1 to spectrum analyzer and set TX gain from -35 to 21 in 2 db steps. > Until > > -5 db the signal gradually increases, but from -5db to -3db it drops > down to > > lowest. Is there something I should pay attention while using higher > gain > > values. Meanwhile I do not play with RX gain or noise level, leave > them at > > default values. > > > > thanks > > yavuz > > > > > > > Hi, > > i am facing the same issue, and have spend the whole day to find that > tx_gain value is not set no matter what. the output signal only > registers maximum of 1.6 dBm on watt-meter. > Temperature is not high so i doubt temperature is a problem. may be its > related to uhd driver? or tx_gain values not written to eeprom. > > i might be missing some configuration option or trick. any help is much > appreciated, > > thanks, > arif > > >
