DBBC2 calibration

Everytime a new DBC firmware version is installed (PFB or tunable) the calibration parameters should be determined.

1) Apply a tone of 764 MHz at -15dBm to input #1 of all of the DBBC boards (use a splitter)

2) Start the DBBC firmware (PFB or DDC) and wait until programming is finished

3) start the DBBC client (e.g. "DBBC client v4.exe")

If you have 4 core boards:

dbbcifa=1,agc,1     (selects input #1 for ifa)
dbbcifb=1,agc,1     (selects input #2 for ifb)
dbbcifc=1,agc,1     (selects input #2 for ifc)
dbbcifd=1,agc,1     (selects input #2 for ifd)

wait a while until the agc has stabilized then inspect the attenuation:

dbbcifa
will yield e.g.:
dbbcifa/ 1,53,agc,1,37805,38000,-1

now manually set the attenuation:

dbbcifa=1,53,1

repeat the last two steps for the other core boards

4) start the calibration

for PFB mode:

calibration

for DDC mode:

dbbcgain=all,man
calibration=all

a file containing the results is produced in c:\ (e.g. DATE-calib.txt). Inspect or plot the DATE-calib.txt file and search for the minimum between the two peaks.Insert the minimum values into the configuration file e.g. c:\DBBC_CONF\dbbc_config_file_104.txt (file name varies depending on the version). Edit the line just above CAT2 entry.