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Will Hawkins hawkinsw at opentechinstitute.orgThanks Alexander, I will give this a try first thing tomorrow morning and let you know how it goes! Will On 05/22/2013 05:30 PM, Alexander Chemeris wrote: > Hi Will, > > Thank you for the good news. Answering to your question, first please > update your UmTRX firmware and host side UHD: > 1. Update your UHD and umtrx_scripts from the git. Build UHD. > 2. Flash attached ZPU firmware to a UmTRX with the following command: > ./usrp_n2xx_net_burner.py --addr=192.168.10.2 --fw=usrp2p_txrx_uhd.bin > 3. Power cycle UmTRX > > Calibrate with GPS: > 1. Take your UmTRX outside to get GPS lock. > 2. When GPS acquires a lock, use 'umtrx_vcxo.py' utility without > parameters to read current VCTCXO DAC value in a loop. > 3. When the value stabilise (couple minutes after GPS acquires the > lock), write this value to EEPROM: > ./usrp_burn_mb_eeprom --key tcxo-dac --val <YOUR_VAL> > 4. Now i should pickup the value from EEPROM on boot, so GPS is no > required unless you change ambient temperature considerably. > > Note, that you should warm up your UmTRX for a while before > calibration, because it depends on the TCXO temperature. > > Let me know if something goes wrong - I wasn't able to test > everything, as I don't have my UmTRX with me at the moment. > > On Tue, May 21, 2013 at 9:50 PM, Will Hawkins > <hawkinsw at opentechinstitute.org> wrote: >> Hey Alexander! >> >> Yesterday we took our umtrx outside to get the GPS lock for calibrating the >> tcxo voltage. There were some good outcomes and bad outcomes: >> >> The good: >> If you remember correctly, Dan could not associate to the umtrx with his >> Galaxy Nexus. After getting a GPS signal, Dan's phone could associate! So, >> great news. >> >> The bad: >> We attempted to record the calibrated tcxo dac values and had no luck. We >> booted the umtrx board connected via serial console to my laptop. I was able >> to see the boot messages and other output so I know the console was working. >> Once the board got a GPS lock, I assumed that I would see some tcxo DAC >> values printed to the console. Based on what you said last week, I was going >> to wait until those values stabilized and then use that output to flash into >> the eeprom. Unfortunately I did not see any output on the serial console. >> Then I thought that we could poll the umtrx (using UHD probe) for its tcxo >> dac values. Unfortunately it showed the default (2048) every time. >> >> Can you tell me what I'm doing wrong? >> >> Thanks! >> Will >> >> PS: CC'ing Dan since he's working this with me. > > >