Table 1: RECEIVER: Receiver properties
RECEIVER: Receiver information

Name

Format

Units

Measure

Comments

Columns

Key

TIME

Double

s

EPOCH

Midpoint of time for which this set of parameters is accurate

INTERVAL

Double

s

Interval

Data description

NUM_LO

Int

Number of local oscillators

Data

NAME  

String

Receiver names

RECEIVER_BAND  

String

Receiver band

FREQ_LO  

Double(NUM_LO)

Hz

Frequency LO

SIDEBAND_LO  

Int(NUM_LO)

Sideband of local oscillators

(DEWAR_NAME)   

String

Dewar name

TDEWAR  

Float

K

Receiver dewar temperature

(STABILITY_DURATION)   

Double

s

Time scale for the relative stability

(STABILITY)   

Double

Relative stability over the timescale

Flags

(STABILITY_FLAG) 

Bool

Flag for STABILITY


Notes: This table holds summary information with measured properties of the individual receivers. Indexed in the FEED  table.
TIME
Mid point of the time interval over which the data in the row are valid. Require to use the same TIME Measure reference as in MAIN 
INTERVAL
Each time a receiver is tuned there is a new entry ( RECEIVER_ID) in this table.
NUM_LO
Number of local oscillators
NAME
Receiver name
RECEIVER_BAND
Receiver band. For the frequency bands they are at present identified by an integer in the range 1 to 9.
FREQ_LO
Sideband of local oscillators
SIDEBAND_LO
Sideband (+1,-1) of local oscillators
DEWAR_NAME
Dewar name
TDEWAR
Receiver dewar temperature
STABILITY_DURATION
STABILITY
Root square of the Allan variance
STABILITY_FLAG
Flag for STABILITY

Remark: This sub-table had been planned but not described in the MS vers. 2 document. References to entries to that table, via the RECEIVER_IDidentifier, were anticipated in the SPECTRAL_WINDOW  table.
Receivers are associated to feeds which are associated to antennas. For this reason it is proposed to keep SPECTRAL_WINDOW  as generic as possible (i.e. with no ANTENNA_IDprimary key) by moving the RECEIVER_IDindexing in the FEED  table. This modification also allows to have more than one receiver per spectral window as that is the case when there are several different polarization products.