Configure the 2.5 cm receiver in Total Power mode through the NCCS ================================================================== MJG 2002/05/08 setup.2p5tp At PC NCCS1, to the right of the rack in the new tables in the control room, type: whoami [verify current user is "dserver"] If not dserver, exit and logon as dserver. Then configure the receiver by typing: Toggle_menu hartrao/toggle/dro10510 [2.5cm Downconverter 10510 MHz DRO] 3 [to turn on 2.5cm DRO for observing] 0 [to exit] Ndiode_menu hartrao/ndiode/06.0h [high level noise diode] 4 [to turn off possible modulation, as 2.5 ND is linked to it] 0 [to exit] Ndiode_menu hartrao/ndiode/04.5h [high level noise diode] 4 [to turn off possible modulation, as 2.5 ND is linked to it] 0 [to exit] Ndiode_menu hartrao/ndiode/03.5h [high level noise diode] 4 [to turn off possible modulation, as 2.5 ND is linked to it] 0 [to exit] Ndiode_menu hartrao/ndiode/02.5h [high level noise diode] 4 [to turn off possible modulation] 0 [to exit] Selector_menu hartrao/select/GPRpre [General Purpose/18cm Mixer Input] 4 [to "write", ie. update GPM RF input connection] 2 [connect the 2.5cm receiver to the GPM RF input] 0 [to exit] Selector_menu hartrao/select/GPRfilt [General Purpose / 18cm Filter] 4 [to "write", ie. update GPR RF filter connection] 2 [select the 1666MHz filter, used for 2.5cm 12178 MHz methanol] 0 [to exit] Selector_menu hartrao/select/GPRpost [160MHz NB IF input selector] 4 [to "write", ie. update NB IF input connection] 5 [connect the GPM output to the NB IF] 0 [to exit] Select polarization (only if using old correlator on HP1000) ------------------------------------------------------------ At rack N29, 160 to 60 MHz IF down converter: select LCP [this receiver produces only one polarization] Set up the local oscillator --------------------------- At rack N08, set the HP8662 synthesizer frequency to 754 MHz: Press: blue button, Frequency, 7, 5, 4, MHz. Check the IF signal is present ------------------------------ At rack N28, connect the Spectrum Analyser input to: 160 MHz GPR LCP Check the IF bandpass for the presence of a signal centred on 160 MHz, and for ripple or interference. If the video signal level on HP 3400 is too low ----------------------------------------------- Take out attenuation at rack N28: "160MHz NB IF Distribution" check subreflector ------------------ focus = 9.0 special for 2.5 cm tilt = -0.77