receiver = <receivercode> ! this selects what collimation parameters to use, and specifies ! which receiver the LO power is routed to. (My understanding is ! that only one receiver at a time receives LO power.) firstlo = <first LO frequency in GHz> phasemod1 = <NONE | SINE | WALSH > ! specifying the functional form of the phase modulation imposed on ! the first Local Oscillator. May also want to specify the order of ! the Walsh function, although letting it be implied by the number of ! available antennas is probably OK. The suffix 1 indicates that it ! is applied to the first LO. ! I include this technical detail in the script because I'm quite ! unsure that we can a priori make the right choice that will work ! for everything. phasemodrate1 = <modulation rate in Hz> ! Basic modulation rate (repetition of the Walsh functions, or lowest ! harmonic for the sine waves). Each antenna will have a sequency or ! harmonic number of it's own. ! If WALSH is selected, there will be interesting constraints on permitted ! rates firstlodoppler = <OFF | SET | SETREF | TRACK | TRACKREF > ! SET = set LO at scan beginnings ! TRACK = track continuously during scan ! REF = set LO at mosaic center; otherwise at mosaic offsets ! If not OFF, firstlo frequency is barycentric dopsource = <source descriptor | CURRENT> ! Use given source descriptor to calculate doppler, rather than current ! source (to observe bandpass calibrator at same frequency as main field)