Band-2 Prototype Cartridge Project – Summary for ASAC meeting Optical design was completed, implemented and characterized. MMIC CLNA designs complete,

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Presentation transcript:

Band-2 Prototype Cartridge Project – Summary for ASAC meeting Optical design was completed, implemented and characterized. MMIC CLNA designs complete, wafer run in progress at the foundry, expected completion is January Prototype cold cartridge has been assembled and tested – comprises of final designs for horn, OMT, feed-throughs – but still using backup hardware (e.g. “chip- and-wire” CLNAs) where necessary. A prototype WCA/LO has been assembled and integrated with an interim single polarization 2SB downconverter (based on commercial mixers) after existing MMIC 2SB chips (originally proposed for this project) were found to have a problem. Made preliminary measurements for the Band-2 receiver, iterated receiver configurations, and have a new optimized signal flow configuration based on these initial results (e.g. need to add RF post amplifier, RF band definition filter etc). Currently waiting for parts to implement the final dual-polarization 2SB mixers – expected to be available by end of October Once the revised configuration of the dual polarization 2SB down-converter is completed, final evaluation of the Band-2 prototype receiver will commence in early November. Intend to finish evaluation by December 2015, to allow sufficient time for documentation/final report.

Band-2 Prototype Cartridge Project Band-2 Cartridge as installed in test cryostat

Band-2 Prototype Cartridge Project We have integrated a backup mixer into the LO WCA, so as to continue with cold cartridge Photo of a standard Band-6 WCA modified to incorporate a RF amplifier and RF down-converter (one-channel, temporarily for initial testing).

Band-2 Prototype Cartridge Project F=92 mmF=86 mmF=87.2 mm Horn diameter = 0.591” Aluminum mandrel for the Band-2 horn after electro- deposition Finished Band-2 Horn Finished Band-2 Lenses Test Mandrel cut open after electro-deposition Mandrel prior to deposition

Band-2 Prototype Cartridge Project RF hybrid used for the single channel 2SB down-converter built using a pair of commercial mixers. A dual channel version of the RF hybrid is being machined in the CDL workshop to implement the final down-converter.