SOD     Byte  Start  Description
         46    date
-------- -- -------  --------------------------------------------------------
78113802  1 1988134  Baseline system configuration:
                     PMT FEU-87, PS-500 Timer, maximum likelihood 
                     discriminator B-6, 4ns/1Hz Nd:YAG laser,
                     TV method+LORAN C synchronization with UTC,
                     Rb-frequency standard, barometric pressure-mercury
                     column, mount Az-El; separate trensmitting and
                     receiving optics, diameter of main telescope-65 cm,
                     controller computer MERA-400,
                     ground target distance 1295.42 m
78113802  1 1990298  PMT RCA-8852 replaced PMT FEU-87
78113802  1 1991049  GPS time receiver for synchronization with UTC 		 		 		 		 	 
78113802  2 1991264  New 100ps/10Hz Nd:YAG laser
78113802  2 1991264  New real-time software
78113802  2 1992273  New start detector-avalanche photodiode
78113802  2 1993202  Rb-frequency standard for PS-500 Timer
                     (elimination of large range bias!)
78113802  2 1994271  PS-500-2 Timer replaced PS-500 Timer
78113802  2 1995052  New controller computer PC-486, new real-time software,
                     new tracking system
78113802  2 1995213  Rb-2 frequency standard replaced Rb-standard
78113802  3 1997034  PMT HAMAMATSU H5023 replaced PMT RCA-8852
78113802  3 1997065  CCD camera installed
78113802  3 1997077  cesium frequency standard replaced Rb-2 standard
78113802  3 1997110  amplifier HAMAMATSU C5594 installed
78113802  4 1997155  PMT RCA-8852 replaced HAMAMATSU H5023
78113802  5 1997310  PMT HAMAMATSU H5023 replaced RCA-8852
78113802  6 1998035  New ground target - distance 241.086 m
78113802  7 1998139  Time Interval Counter STANFORD SR620 replaced PS-500-2
78113802  8 1998182  VAISALA meteo sensors installed; 
                     pressure PTB200A (0.1 mbar), temp. and humidity HMP45D,
                     + Time Interval Counter PS-500-2
78113802  9 2000059  Etalon removed from laser, laser pulse width is 
                     shorter - 40 ps
78113802  0 2001342  New time and frequency source - cesium frequency 
                     standard HP5071A ver.001
78113802  1 2001342  New camera CCD installed
78113802  2 2002127  Time Interval Counter PS500-2 replaced by
                     STANFORD SR620
78113802  3 2002319  Time Interval Counter STANFORD SR620 replaced by
                     STANFORD SR620B
78113802  4 2002323  New start fast photodiode and discriminator
                     TENNELEC 454 in start channel
78113802  5 2003088  Discriminator B6 replaced by discriminator TENNELEC
                     TC454 in stop channel