- On NOEL:: run CAIN and start CAOBS
$ cain
E xpert mode
C hange cycle time
cycle time = 10 sec
Check cycle starts on 00, 10, 20, 30, 40 or 50 seconds.
$ caobs
CAOBS> corr closef ! start new RPFITS file
CAOBS> set file ...
CAOBS> set rise 200
CAOBS> set ref ca06
CAOBS> set lo_track_off ! no LO tracking
CAOBS> track 1
Wait until tracking a source -- ! ( set bypass ?? )
CAOBS> dis auto
CAOBS> set atten ca06 nnnn
- Antenna setup:
RCP ==> A LCP ==> B
Fobs BW F(if) -->DC F(fluke)* (dBm) F(S&D) Sideband*
---- -- ----- ----- -------- ---- ------ --------
6669 4 70 6667 84.55 @ +0 58 USB
8420 16 88 8428 960.05 @ -10 40 LSB
12180 4 70 12182 204.975 @ +3.1 58 LSB
* Test tone at F(obs) + 100 KHz.
$ caobs_param
S et
G lobal
Conversion chain [1,2]? 1
P hase
eg. 6 B 20 ! increment phase of B1 by 20 deg.
CR
CR
CR
- S2 setup:
S2> log clear
S2> time ( eg. time 180-22:00:00 ) ! Phone (0) 1194
--> and hit return after the third pip.
S2> mode 32x4-2 ! 16(MHz) x 4(lines) - 2(bits)
16x4-2 ! 8(MHz) x 4(lines) - 2(bits)
8x4-2 ! 4(MHz) x 4(lines) - 2(bits)
! Note: lines = bits x polarizations
S2> tapeid ATNF nnnn ! or ATNF nnnn-l,m
S2> user info 1 CULGOORA
S2> user info 2 V068
S2> user info 3 8420MHz-16MHz
Load tapes - ( 2 for 4 MHz, 8 for 16 MHz)
S2> rewind
S2> record
S2> uic dcbias n 10 s ! Check data statistics
! n=0, n=2 ==> 50% (sign bit, chan 0&1)
! n=1, n=3 ==> 34% (mag. bit, chan 0&1)
If not recording, use "feedthru" mode
S2> uic feedthru on
- On NOEL:: start observing
CAOBS> start
- On NOEL:: start VLBI_WATCH.
If VLBI_WATCH is already running, stop it and rename the
log file:
$ stop vlbi_watch
$ sd at:[observer.vlblog]
$ rename vlbi_watch.log vlbi_watch_93134.log ! e.g. for a log file
! started on day 134 of
! 1993.
First copy the appropiate tcal file to TCAL.DAT
$ sd at$calibration
$ copy tcal_4850.dat tcal.dat ! e.g. for 4850 MHz observation.
then start VLBI_WATCH:
$ sd at:[observer.vlblog]
$ vlbi_watch ! output file is VLBI_WATCH.LOG.
- Change tapes:
CAOBS> stop ! Note: You may need to close the
CAOBS> start ! RPFITS file during a tape change
CAOBS> set tton ! so that it does not exceed 500000
! blocks.
S2> stop
S2> eject
change tapes
S2> tapeid ATNF nnnn
S2> rewind
S2> record
CAOBS> set ttoff
- Resynchronize the clock on NOEL:: about once per day:
In CACOR type
CACOR> settime
On CAOBS type
CAOBS> systime
Other S2 Commands
S2> status reset
S2> log display fullscreen
S2> log clear
S2> exit ! ==>
S2> shell ! ==>
S2> <ctrl> L ! redraw screen
Recording with an S2 command file
Example with 4 MHz bandwidth (2 tapes):
Insert tapes
s2> group 0
S2> rewind
s2> group 1
S2> rewind
s2> group 2
S2> rewind
s2> group 3
S2> rewind
s2> group 0
s2> tapeid ATNF 0137-0,1
S2> batch edit v057.bat
i ! enter insert mode
sleep 182-05:00:00 ! wait till start
record
sleep 182-09:00:00 ! wait till next tape change
stop
eject
group 1
tapeid ATNF 0137-2,3
record
sleep 182-13:00:00 ! wait till next tape change
--- etc ---
or
rewind
wait stop
record
<esc> ! <esc> back to command mode
x ! delete
ZZ ! save file and exit
S2> batch verify v057.bat ! verify
S2> batch v057.bat ! execute
or <ctrl> C ! to exit from batch mode
To TELNET to S2:
L$ telnet
TELNET> connect cas2
S2> -- etc --
S2> shell
-> logout
TELNET> exit
To extract logfile
L$ telnet
TELNET> log-file v057.log
TELNET> connect cas2
S2> log display fullscreen
S2> shell
-> logout
TELNET> exit
To Finish Up and Exit from a VLBI Observation
- On CAOBS
CAOBS> stop
CAOBS> enab auto
CAOBS> set rise 0
CAOBS> set lo_track_on
CAOBS> set ref ca03
- On NOEL:: Stop VLBI_WATCH and rename the log file:
$ stop vlbi_watch
$ sd at:[observer.vlblog]
$ rename vlbi_watch.log vlbi_watch_93134.log ! Eg. For a log file
! started on day 134
! of 1993.
$ sd usr$0:[vlbi.sh93-50] ! For experiment SH93-50
$ copy at:[observer.vlblog]vlbi_watch_93134.log []
Original: Russell Gough (2-JUL-1995)
Modified: Nuria McKay (9-OCT-1995)
