SUMITEM

SUMITEM is used to control the items listed in the summary file for each antenna. Two items are listed for each scan for each antenna on each summary pass. Up to 10 items can be requested causing up to 5 summaries to be produced in the .sum file. The items that can be requested are:

EL1:

The elevation at the start of the scan. For scans where the source is below the hardware limits or the horizon, a letter code will be included.

EL2:

The elevation at the end of the scan. The limit code will be included.

ELA:

The average elevation of the scan ((EL1+EL2)/2). The limit code will be included.

AZ1:

The azimuth at the start of the scan. The limit code will be included.

AZ2:

The azimuth at the end of the scan. The limit code will be included.

AZA:

The average azimuth of the scan ((AZ1+AZ2)/2). The limit code will be included.

PA1:

The paralactic angle at the start of the scan.

PA2:

The paralactic angle at the end of the scan.

HA1:

The hour angle at the start of the scan.

HA2:

The hour angle at the end of the scan.

EARLY:

The number of seconds that the antenna arrived on source before the scan started. Negative numbers are common and are the number of seconds that the antenna arrived on source after the scan started.

DWELL:

The number of seconds of on-source time in the scan. This does not take into account correlator resync times. See SYNC for that information. The total integration time should be the smaller of DWELL and SYNC. Note that neither takes into account the time needed to switch between receiver bands (that's on the wish list).

SLEW:

The slew time in seconds from the previous source.

TAPE1:

The tape drive in use, the recording direction, and the head index position. Cannot be used if NOSETUP is specified. If the station only has disk, the total GBytes recorded at the station up the the end of the scan is given.

TAPE2:

The set of heads in use (for example which of the TRACKn inputs is in use) and the tape footage in thousands. Cannot be used if NOSETUP is specified.

DISK:

The total GBytes recorded at the station up the the end of the scan is given. Nothing useful is given for tape only stations. Cannot be used if NOSETUP is specified.

TPSTART:

Show the offset of the recording start time from the scan start time. This is established by parameters PRESTART and MINPAUSE

SYNC:

The expected integration time with the correlator synchronized. This takes into account time lost to resyncs and formatter reconfigures. It does not take into account slew times, which DWELL does.

If any other items are desired, please inform Craig Walker.

Users of EVN antennas (and any others controlled by the PCFS and VEX) are advised to study the listing created by EARLY. Currently there is no complete mechanism for PCFS to monitor whether the telescope was on source when the recording starts. Data taken during this time are invalid, but are not flagged automatically. Therefore it is advisable to make schedules with DWELL or inspect the listing for telescopes that arrive late on source.

• Argument: Up to 10 character strings.
• Options: See the description above for valid parameters.
• Default: ELA, DWELL
• Usage: Only one value used, the last.
• Example: sumitem=el1, az1