MATRIX RADIOMETRIC SYSTEM FOR RATAN-600 «МАRS-3» Conclusion of installation A.B.Bеrlin, N.A.Nizhelsky, М.G. Mingaliev, P.G.Tsiboulev, D.V.Kratov, V.V.Smirnov, O.М.Pylypenko

The system is developed for instrumentation supply of the Cosmological Gene project (Scientific leader academician Yu.N.Parijskij Project Fases «МАRS-1» - «МАRS-2»- «МАRS-3» «МАRS-1» (2001) - 1 radiometric module, that was developt and investigated in «Total power», «Noise added radiometer» (NAR) and modulation (МОD) modes «МАRS-2» (2003) – more than 3 years round-the-clock operated 3- channel system (МОD mode) with basic parameters: Central frequency 30 GHz Bandwidth 4 GHz Т sys = 220 К (Sensitivity 6 mК/s 1/2 for each channel) «МАРС-3»(2006) - 16-channel system (МОD) with 5 GHz bandwidth, calculated Т sys = К, 5 mК/s 1/2

The base of matrix systems «МАRS-1» - «МАRS-2» – «МАRS-3» is the radiometric module, wich inclusive all componemt parts of classic radiometer: front-end LNA, output amplifiers, bandpass filter, detector, low frequency amplifier «МАRS-2» radiometric module with broad band fast- operating ferrite modulator

Structure chart of 3-channel matrix radiometric system «МАRS-2»

HF part of 3-channel matrix system «МАRS-2», is more than 3 Years in operating at RATAN-600 radio telescope

In 2004 the front-end part of the «МАRS-2» system was reconstructed (was add the possibility of axial rotation of linear polarization analyser to +-45 о)

The focal line of RATAN-600 Feed Cabin Nr.1with primary feeds. Qn the left 3-channel matrix system «МАRS-2» is placed, on the right is 3-frequency feed with superposed phase centers at decimeter wavelengths сm

Observation of radiation bands of Jupiter with high resolution at RATAN-600 using «МАRSС-2» system

A new element base of the «МАRS-3» receiving module 1. Instead of hybrid front-end LNA (3 stage of PHEMT) the finished monolithic IC (f. Fujitsu) with noise ( К) less as hybrid circuit is used. 2. In a back-end amplifiers are monolithic "unconditionally stable" IC with unipolar power supply, lower noise and greatly depressed heat generation as comparison to «МАRS-2» are applicated.

«МАRS-3» radiometric module with broad-band (5 GHz) ferrite modulator (on left) and noise generator module

«МАRS-3» HF unit draft Front-end waveguide part: Primary feeds (32) Tranfers from round to rectangular section with +-45 о rotation (32) Straight waveguides or +-45 о twists (32) Curved waveguides with directional couplers for calibration Modulators (switches) (16 ) Radiometric modules (16) with a new element base

HF part of «МАRS-3» Front-end waveguides, switches and receiving modules are on the unified temperature-stabilized aluminum plate encased.

Underside of the assembly plates the power supply lines and thermostats are installed.

By development of the «МАRS-3» system we pay attention to search of fabrication method for many waveguide elements (primary feeds, twists, curved waveguides, directional couplers etc.)

The first manufactured elements of the 16-channel (32 feeds) «МАRS-3» system are primary feeds and waveguide adapters from circular to rectangular section

Waveguide parts of «МАRS-3» system: Twists to +-45 о and bends in Е and Н-flatness

Removable references for observation of distant radio sources and background radiations

Choice of technology and development of adjusting devices for manufacture of waveguide parts : hogging (а) and twist (b), precise soldering of flanges (c and d)

For feeding of active components the high-stable power supplies from Ekaterinburg (12 units) are used

Summary 1. Use of know-how and microwave miniaturization show the profitability of designing of the matrix systems in focal plane of the RATAN-600 radio telescope, which allowed the extension of number of elements N up to 100 and more. 2.It is possible in meridian receive mode in square root of N to increase the sensitivity of RATAN-600 radio telescope and in N time to reduce the number of days required for data storage from weak sources.