Magazine:

Review contents:

• Equipment for Satellite Transmission of the TV Signal

• The Decisions from "Broadcast Arsenal"
• The Equipment of the Continental Microwave Company
• The Mobile Cellular Receiving Transmitting Antenna of Ku Diapason MAS 150 M
• The Wideband System of Data Transfer through the Satellite
• The Swe Dish Internet Terminal
• System of guaranteed data delivery over satellite channel

625 Content: 2002 : #5

The Mobile Cellular Receiving Transmitting Antenna of Ku Diapason MAS 150 M
By Leonid Pitchugin

The research-and-production integration specialists in the applied mechanics of the Rechetnev Academy an the I.S.P.A.-Engineering Company conducted a number of investigations in the field of adapting of the antennas' making technology of the Russian connection satellites to the conditions of using of antennas systems on earth. The mobile cellular receiving transmitting antenna MAS 150 M that is used for the connection through the geostationary artificial satellite in the frequency Ku band became the result of these works. The development is unique as by its technical decision as by the opportunities of use (Ku band is 11/14 GHz, the electric characteristics, antenna's overall dimensions, the energy of the artificial satellite covering) with the advantages of the cellular reflector (small weight and overall dimensions if the set condition, etc).

The technical and exploitation characteristics of MAS 150 M come up to the requirements of the main world satellite operators, including Intelsat, Eutelsat, Loral Skynet and others. According to the price/quality ratio the new development is highly attractive for the organisations which deal with the system integration. Taking into accounts the guarantee and after guarantee support of the producer MAS 150 M can easily compete with the best western samples. The constructive peculiarities of the antenna allow calling MAS 150 M the ideal decision for the reporter TV and radio broadcasting.

The antenna system weights only about 30 kg and consists of the four main functionally finished assembly elements: reflector, which is done as the folding umbrella construction with the hard power and auxiliary spokes, flexible cable frame and the metallic radio reflective net flat, the mechanism of unfolding of the reflector on the mechanic support, exciter on the mechanic support and support-rotating facility which includes the hard base for the strengthening of the antenna system on the tripod support and putting into the horizon rotating facility which allows aiming the antenna system by the angle and azimuth of the place.

For the comfort of transportation and storage the assembly elements of MAS 150 M are placed in the special container that is appropriate for the transportation by any means of transportation. The antenna system is simple in exploitation, folding and unfolding. The time of unfolding on the work ground is less than 7 min. During the opening of the reflector the work surface of 1500 mm area is formed. The special platform set on the tripod support provides an opportunity of editing of user's apparatus.



Stages of putting of antenna into operation condition

MAS 150 M is assigned for the exploitation in the hard meteorological conditions. The maximum operating wind speed can achieve 20 m/sec (normal operating wind speed is up to 12 m/sec), the diapason of the environmental temperature -50...+60°C, the relative air humidity up to 100% at the temperature of 25°C, the atmosphere pressure 630.800 mm m. b. Accordingly, the exploitation of MAS 150 M is possible in the rain, snow and shower.

To appraise the operating opportunities of MAS 150 M by the main operating characteristics look at the table below.

The mechanical parameters of MAS 150 M
Limits of establishing	azimuth	angle of the place
	±90°	5...45°
The rotation of the flatness of polarization	±95°
Operating surface	the cutting of cylinder of Ø1500 mm from the parabolic surface
Mean-square deflection	σ≤0.2 mm
The electric parameters of MAS 150 M
	the meaning of the parameter from the exit
	of receiving	of transmitting
Operating frequency diapason, MHz	10950...12750	13750...14500
SWR, to over	1.35	1.35
gain factor by the axis dyne of antenna on a frequency:
10950 MHz, not less	42.7
11950 MHz, not less	43.4
12750 MHz, not less	44.0
14000 MHz, not less		44.6
14250 MHz, not less		44.8
14500 MHz, not less		44.9
Polarization	linear,orthogonal to thetransmission channel	linear,orthogonal to thereceiving channel
Cross-polarization flyover in the circuit with the weakening of1.0 dB on the transmission and 0.5 dB on the receiving, dB, not less	30	30
The level of the side petals for 90% of side petals, dB, not less:
for 1°≤ θ ≤ 20°	29...25 lgθ	29...25 lgθ
for 20° ≤ θ ≤ 26.3°	-3.5	-3.5
for 26.3° ≤ θ ≤ 48°	32...25 lgθ	32...25 lgθ
for 38° ≤ θ ≤ 180°	-10	-10
Temperature of noise of antenna from the exciter outletat the clear weather with the angle of the place 10°, K, not over	75
Temperature of noise of antenna from the exciter outletat the clear weather with the angle of the place 10°, K, not over	250
The losses in the wavy section of antenna before the exit rectangular flanges of the exciter, dB, not over	0.3	0.3
Flyover between the receiving and transmitting entrances, dB, not less	100	100

The I.S.P.A.-Engineering Company.

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