MODES OF THE ALMA TEST CORRELATOR (GBT CLONE)

The ALMA test correlator has two basic modes of operation, 800 MHz or wide band and 
100 MHz or narrow band operation. Below is a tabulation of the test correlator modes 
given in terms of antennas 0 and 1, R (right) and L (left) polarization;



MODE	BANDWIDTH   PRODUCTS             LAGS           DELAY RESOLUTION   DELAY RANGE
--------------------------------------------------------------------------------------
 1       800 MHz    0R X 1R    512 LEADS AND 512 LAGS    8-SAMPLES          10 uSEC
                    0L X 1L              "                   "                 "
                    0R X 1L              "                   "                 "
                    0L X 1R              "                   "                 "


 2       800 MHz    0R X 1R   1024 LEADS AND 1024 LAGS   8-SAMPLES          10 uSEC
                    0L X 1L              "                   "                 "

 3       800 MHz    0R X 0R          1024 LAGS               -                 -
                    0L X 0L              "                   -                 -
                    1R X 1R              "                   -                 -
                    1L X 1L              "                   -                 -


 4       100 MHz    0R X 1R   4096 LEADS AND 4096 LAGS   4-SAMPLES          80 uSEC
                    0L X 1L              "                   "                 "
                    0R X 1L              "                   "                 "
                    0L X 1R              "                   "                 "


 5       100 MHz    0R X 1R   8192 LEADS AND 8192 LAGS   4-SAMPLES          80 uSEC
                    0L X 1L              "                   "                 "


 6       100 MHz    0R X 0R          8192 LAGS               -                 -
                    0L X 0L              "                   -                 -


 7       100 MHz    1R X 1R          8192 LAGS               -                 -
                    1L X 1L              "                   -                 -
--------------------------------------------------------------------------------------
The same memory card personalities that support the modes above can be used to support 400 
MHz and 50 MHz over sampled modes with the same number of lags indicated for 800 MHz and 
100 MHz bandwidths respectively.