* c.rxg - c band receiver parameter definition
*
* first line: LO values and ranges, format:
*  type   frequencies
* if type is range, the two values: lower and upper frequencies
* if type is fixed, then the fixed value
* frequencies in MHz
*
fixed 5843 
*
* 2nd line: creation date
* format:  yyyy ddd or yyyy mm dd (0 is valid for all for intial set-up)
*
2018 07 05 
*
* 3rd line: FWHM beamwidth
* format: model value
*
* if model is frequency, then fwhm=value*1.22*c/(freq*diameter)
*                        value is 1.0 if omitted
* if model is constant, then fwhm=value (degrees)
*
frequency 1.0
*
* 4th line polarizations available
*
* one of both of lcp and rcp
*
lcp rcp 
*
* 5th line: DPFU (degrees/Jansky) for polarizations in previous line in order
*   J. McCallum 13032020
*   I'm a bit confused with the values in the DPFU and gain lines - do you 
*   really have 40 Jy/K or does the polynomial gain curve bring that down? 
*   I'd expect a PDFU of ~0.1 for a 30m dish.
*
*0.025 0.025
0.1 0.1
*
* 6th line: gain curve (only one) for ALL polarizations in 4th line
* TYPE FORM COEFFICENTS ... [opacity_corrected]
*
* FORM = POLY only for now
* TYPE - ELEV and ALTAZ only for now
* COEFFICENTS - variable number of number values
* opacity_corrected - optional final field, if present it indicates that
*                     the curve is opacity corrected
*
* maximum coefficents 10
*
* 1st Gain curve for 6.7GHZ
*
*             3           2       
* -0.0001529 x + 0.02853 x - 1.744 x + 122.3
* Taken from data produced by T.Natusch Dec 2014
* Used Python Numpy Polyfit, S.Weston 10/7/2018
*
ELEV  POLY 1.0 0.0 0.0 0.0 0.0 0.0
*ELEV POLY 122.3 -1.744 2.853e-02 -1.529e-4
*
* 7th and following lines: tcal versus frequency
*     Format: POL FREQ TCAL
*     where:
*            POL    polarization rcp or lcp
*            FREQ   frequency (MHz)
*            TCAL   degrees K
*
*     ends with a line containing end_tcal_table
*
*     MAXIMUM ENTRIES 400, group by polarization
*                          then sorted by increasing freq
*
* Measured SEFD in C-Band ~ 650Jy (http://adsabs.harvard.edu/abs/2015PASP..127..516P)
* So TCAL ~ 90 K
*
rcp 6516.00 9.872
rcp 6526.00 9.872
rcp 6536.00 9.872
rcp 6546.00 9.872
rcp 6656.00 9.872
rcp 6666.00 9.872
rcp 6676.00 9.872
rcp 6686.00 9.872
lcp 6516.00 9.872
lcp 6526.00 9.872
lcp 6536.00 9.872
lcp 6546.00 9.872
lcp 6656.00 9.872
lcp 6666.00 9.872
lcp 6676.00 9.872
lcp 6686.00 9.872
end_tcal_table
*
* Trec: receiver temperature
*
0.0 0.0
*295.15 295.15
*257.78 257.78
*249.0 249.0
*
* Spill over table
*
* 9th and following lines: Spillover versus frequency
*     Format: Elevation Tspill
*     where:
*            POL    polarization rcp or lcp
*            FREQ   frequency (MHz)
*            TCAL   degrees K
*
*     ends with a line containing end_spillover_table
*
*     MAXIMUM ENTRIES 20
end_spillover_table