tcxo calibration / pps signal catch problem / end of burst does not work

Hello, All! 1. I'm also (as Andrew Back) interested about calibration methods, but I can not find calibration technology description. How i can calibate device? 2. test_pps_input program failed with message: Using Device: Single USRP:   Device: UmTRX Device   Mboard 0: UMTRX-REV0   RX Channel: 0     RX DSP: 0     RX Dboard: A     RX Subdev: LMS6002D (0xfa07) - 0   TX Channel: 0     TX DSP: 0     TX Dboard: A     TX Subdev: LMS6002D (0xfa09) - 0 Attempt to detect the PPS and set the time... --     1) catch time transition at pps edge Error: RuntimeError: Board 0 may not be getting a PPS signal! No PPS detected within the time interval. See the application notes for your device. Where i can get information about pps signal state and gps lock? (from device) 3. I found that eob (end of burst) metadata does not work, signal at spectrum analyzer is present, after sendind eob. How i can mute tx?   thanks for answers ! :-) С уважением, alex korolev nik135(a)mail.ru