A. B. Berlin

MARS-3 matrix radiometric system for RATAN-600

The MARS-3 third-generation matrix radiometric system has been developed, manufactured, and is currently being used in observations within the framework of the “Cosmological Gene” program. The system is based on new hardware components and consists of 16 independent radiometers (32 horns with a step of 20 mm). Each pair of horns is connected to the input of an amplifier unit via a square-loop modulator. The parameters of each radiometer are: central frequency, 30.0 GHz; bandwidth, 5GHz; average noise temperature of the system, 250 K; and a sensitivity of about 5 mK for τ = RC = 1 s.

Small scale I, U, Q galaxy noise at cm. waves

It is shown that the “spinning dust” component does not prevent observation of the CMB anysotropy at high l, values, as well as observation of the CMB polarization at scales which are the most interesting (l=1000). These results were obtained with the 600-meter reflector RATAN-600, equipped with a multi-frequency feed array with an angular resolution up to 0.1×1 arcmin and with a temperature resolution below 100 μK.

1/f-Type noise in a total power radiometer

We report the experimental results of a study of the sources of 1/fα type noise (hereafter referred to as 1/f-type noise for the sake of brevity) in a total power radiometer. We find this noise to have two main sources in the radiometer: microwave amplifiers and the square-law diode detector with a Schottky barrier. We present methods for a substantial reduction of 1/f-type noise, which allow total power radiometer measurements to be performed with nominal sensitivity on time scales of up to 10 seconds. The sensitivity of the total power radiometer on time scales up to 100 seconds remains higher than that of a Dicke switched radiometer.

Search for Small Scale Anisotropy of the 3K Emission of the Universe

One of the greatest mysteries of nature is the absence of any trace of the present structure of the nearby universe in its relict 3K emission.