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EDGES

Experiment to Detect the Global EoR Signature


Haystack Observatory is developing a radio telescope to make accurate measurements of the sky noise from 100 to 200 MHz. The radiometer uses 3 position Dicke switching to derive a calibrated spectrum from the direct sampled data looking at the antenna, an ambient temperature load and a calibrated noise source.

The original antenna was a broadband structure based on the "Fourpoint" design of the Virginina Tech Antenna Group. (S-Y Suh, et al, 2004 IEEE Vehicular Technology Conference, VTC2004, 2004, pt. 1 p 225-0, vol 1)

The original spectrometer was based on the Acquiris AC240 (A.O. Benz et al, A&A, 442, 767-773 [2005]).

Many instrument improvements have been made since the project started in 2006. These include a "blade" antenna whose beam has less frequency dependence, an ADC card with 12 bits/sample, and precise temperature control of the electronics. Current installations at MRO in Western Austraila cover high band from 100–200 MHz and low band from 50–100 MHz.

West Fork Maine Site

Early prototpye EDGES antenna at West Forks, Maine

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