A 3 mm Receiver for the GBT
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Design Considerations for a GBT 68-92 GHz Receiver
Scientific motivation for equipping the GBT with receivers for the 3mm band (68-116 GHz) has been discussed in several memos [1]-[3], and later presented in a proposal by the GBT 3mm Receiver Working Group [4]. It was decided that the first receiver module to be built should be capable of both continuum detection and spectroscopy in the 68-92 GHz band (Module 1). Other frequencies and capabilit...
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Deciding appropriate therapy for multiple myeloma (MM) is challenging because of the occurrence of multiple chromosomal changes and the fatal nature of the disease. In the current study, gamabufotalin (GBT) was isolated from toad venom, and its tumor-specific cytotoxicity was investigated in human MM cells. We found GBT inhibited cell growth and induced apoptosis with the IC50 values <50 nM. Me...
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The strongest interfering signals received in the passband of the Green Bank Telescope’s (GBT) 1.15-1.7 GHz receiver are radar pulses at 1256 and 1292 MHz. These pulses are transmitted by an ARSR-3 FAA Air Surveillance Radar on Apple Orchard Mountain near Bedford, VA, longitude 79.510W, latitude 37.517N, elevation 1288 meters (4225 feet). This radar antenna is about 106 km south-southeast of th...
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More than 150 galaxies have been detected in blank-field millimetre and sub-millimetre surveys. However the redshift distribution of sub-mm galaxies remains uncertain due to the difficulty in identifying their optical-IR counterparts, and subsequently obtaining their spectroscopic emission-line redshifts. In this paper we discuss results from a Monte-Carlo analysis of the accuracy with which on...
متن کاملA First-Order Noise Analysis of the GBT L-Band Receiver Front-End
Introduction Recent investigations of GBT baselines associated with observations of continuum radio sources have revealed the presence of several frequency dependent anomalies in the spectra produced by traditional calibration and normalization practices [1, 2, 3]. The (sig ref) / ref formulation, where “sig” is the signal produced at the receiver’s output when the telescope is pointing on sour...
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