postscript
6 Results...
Abstract...
References...
CMB experiments using amplifiers in the 15-90 GHz frequency range have provided
significat results on all angular scales using both beam-switching and
interferometric techniques. Interferometers, which so far have given results on
smaller angular scales (
to 
), are poised to move into the
crucial regime of 
where the detail of the Doppler peaks is expected
to resolve many astrophysical problems. However, foregrounds remain a problem.
The relatively small frequency range available to HEMTs exacts a heavy price in
signal-to-noise of subtraction of diffuse foregrounds, and point sources demand
simultaneous, high-resolution observations to complement the CMB data.