The GEM 1.5 GHz Receiver System

GEM 1.5 GHz Rationale

The frequency 1465 MHz was chosen because the Galaxy produces a large emission signal at that frequency and there exists a partial (most of northern sky) radio map exisiting is at that frequency. this provides both a test of our technique and a successful collection of data at 408 MHz could make the existing Reich and Reich survey much more valuable by providing full sky coverage and an independent calibration and cross-check. A GEM success could lead to a residual destriping of these data which we have found to be fairly pronounced.

Reports on the 1.5 GHz Receiver and Feed

Summary Report (missing)
1.5 GHz Parts list (missing)
photograph of 1.5 GHz (or 408 MHz) on GEM dish at Bishop California just after a snow storm. This shows the backfire helix antenna clearly. It also shows Andres Umana first experience with snow. This picture taken by George Smoot in late December 1994 during period of GEM observations and training of Andres. See also other Teide pictures.
Antenna beam pattern at 1465 MHz

The project has been supported in part by the US Department of Energy, by the US National Science Foundation, by the Progetto Italia Antartide, by INPE-Brazil, and by Colciencias of Colombia. Some of the publications to date are on the following GEM publication list.

Some preliminary 1465 MHz GEM maps

Return to the Smoot Group page for a complete description of Dr. Smoot's group's research activities.