SAK/BPk..(vkkcir1)..251193 A schematic block diagram of the main elements of the GMRT receiver system. 30 NOS OF FEEDS 45M DISHES ANT ­1 ANT ­2 LOW NOISE AMPLIFIERS IF AMPLIFIERS MIXERS ELECTRONICS BASE BAND 238080 CHANNEL CORRELATOR LO SYNTH MASTER OSCILLATOR ANT ­30 LO SYNTH ELECTRONICS AT ANTENNA OPTICAL FIBRE LINKS ELECTRONICS AT RECEIVER ROOM

... 2.3 Data acquisition Spectra generated by the Multibeam correlator contain the usual structure seen in spectra from other H i instruments: a bandpass spectrum which is the sum of the sky , ground and receiver temperatures multiplied by the product of the filters in the receiver chain; superimposed on this is a noise ... Note also that sources extended much beyond ,40 arcmin can be imaged poorly in HIPASS images because of the bandpass sidelobe effect described in Section 3.3. ...