... 09jun15: rfi measured in screen room . 12jun15: rfi measures in turret room. opening closing lo cabinet doors with anritsu on,off . The anritsu mg3692c is a 10MHz to 20Ghz synthesizer that was purchased to replace the hp83712 20GHz synthesizer used as the upstairs first lo. ... the spectra on page 2 show a 2.5 MHz probe. the transform of the spectra shows peaks at multiples of .4 usec (1/2.5 mhz) . ... We see a 2.5 MHz comb (with 20kHz sidelobes) coming from the lcd screen of the anritsu . ...

... 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. ...