ATNF VLBI Wiki

The values of “PHASE CAL i/j INDEX” are as defined in the vex 1.5 standard except

0-based rather than 1-based
Only 0 and positive integers allowed.
They must come in numerical order

Tone number 0 is defined as first tone above 0Hz in the recorded baseband.

Examples

N.B. All the assume PHASE CAL INT set to 1

No tones written out

# FREQ TABLE #######!
FREQ ENTRIES:       2
FREQ (MHZ) 0:       1358.49000000
BW (MHZ) 0:         8.00000000
SIDEBAND 0:         L
NUM CHANNELS 0:     8192
CHANS TO AVG 0:     512
OVERSAMPLE FAC. 0:  1
DECIMATION FAC. 0:  1
PHASE CALS 0 OUT:   0
@
FREQ (MHZ) 1:       1358.49000000
BW (MHZ) 1:         8.00000000
SIDEBAND 1:         U
NUM CHANNELS 1:     8192
CHANS TO AVG 1:     512
OVERSAMPLE FAC. 1:  1
DECIMATION FAC. 1:  1
PHASE CALS 1 OUT:   0

Typical case: outer tones only

# FREQ TABLE #######!
FREQ ENTRIES:       2
FREQ (MHZ) 0:       1358.49000000
BW (MHZ) 0:         8.00000000
SIDEBAND 0:         L
NUM CHANNELS 0:     8192
CHANS TO AVG 0:     512
OVERSAMPLE FAC. 0:  1
DECIMATION FAC. 0:  1
PHASE CALS 0 OUT:   2
PHASE CAL 0/0 INDEX:0
PHASE CAL 0/1 INDEX:7
@
FREQ (MHZ) 1:       1358.49000000
BW (MHZ) 1:         8.00000000
SIDEBAND 1:         U
NUM CHANNELS 1:     8192
CHANS TO AVG 1:     512
OVERSAMPLE FAC. 1:  1
DECIMATION FAC. 1:  1
PHASE CALS 1 OUT:   0
PHASE CAL 1/0 INDEX:0
PHASE CAL 1/1 INDEX:7

First tone too close to DC:

# FREQ TABLE #######!
FREQ ENTRIES:       1
FREQ (MHZ) 0:       1358.99000000
BW (MHZ) 0:         8.00000000
SIDEBAND 0:         U
NUM CHANNELS 0:     8192
CHANS TO AVG 0:     512
OVERSAMPLE FAC. 0:  1
DECIMATION FAC. 0:  1
PHASE CALS 0 OUT:   2
PHASE CAL 0/0 INDEX:1
PHASE CAL 0/1 INDEX:7

All tones extracted

# FREQ TABLE #######!
FREQ ENTRIES:       1
FREQ (MHZ) 0:       1358.49000000
BW (MHZ) 0:         8.00000000
SIDEBAND 0:         U
NUM CHANNELS 0:     8192
CHANS TO AVG 0:     512
OVERSAMPLE FAC. 0:  1
DECIMATION FAC. 0:  1
PHASE CALS 0 OUT:   8
PHASE CAL 0/0 INDEX:0
PHASE CAL 0/1 INDEX:1
PHASE CAL 0/2 INDEX:2
PHASE CAL 0/3 INDEX:3
PHASE CAL 0/4 INDEX:4
PHASE CAL 0/5 INDEX:5
PHASE CAL 0/6 INDEX:6
PHASE CAL 0/7 INDEX:7

Band matching

# FREQ TABLE #######!
FREQ ENTRIES:       4
FREQ (MHZ) 0:       1358.49000000
BW (MHZ) 0:         8.00000000
SIDEBAND 0:         L
NUM CHANNELS 0:     8192
CHANS TO AVG 0:     512
OVERSAMPLE FAC. 0:  1
DECIMATION FAC. 0:  1
PHASE CALS 0 OUT:   2
PHASE CAL 0/0 INDEX:0
PHASE CAL 0/1 INDEX:7
@
FREQ (MHZ) 1:       1358.49000000
BW (MHZ) 1:         8.00000000
SIDEBAND 1:         U
NUM CHANNELS 1:     8192
CHANS TO AVG 1:     512
OVERSAMPLE FAC. 1:  1
DECIMATION FAC. 1:  1
PHASE CALS 1 OUT:   0
PHASE CAL 1/0 INDEX:0
@Tone below outermost tone to match with FREQ 3
PHASE CAL 1/1 INDEX:6
@
@This Frequency correlates with the first two
FREQ (MHZ) 2:       1350.49000000
BW (MHZ) 2:         16.00000000
SIDEBAND 2:         U
NUM CHANNELS 2:     8192
CHANS TO AVG 2:     512
OVERSAMPLE FAC. 2:  1
DECIMATION FAC. 2:  1
PHASE CALS 2 OUT:   4
PHASE CAL 2/0 INDEX:0
PHASE CAL 2/1 INDEX:7
PHASE CAL 2/2 INDEX:8
@Tone below outermost tone to match with FREQ 3
PHASE CAL 2/3 INDEX:14
@
@This frequency correlates with the first 2 with a 1MHz offset
FREQ (MHZ) 3:       1349.49000000
BW (MHZ) 3:         16.00000000
SIDEBAND 3:         U
NUM CHANNELS 3:     8192
CHANS TO AVG 3:     512
OVERSAMPLE FAC. 3:  1
DECIMATION FAC. 3:  1
PHASE CALS 3 OUT:   4
PHASE CAL 3/0 INDEX:1
PHASE CAL 3/1 INDEX:8
PHASE CAL 3/2 INDEX:9
PHASE CAL 3/3 INDEX:15