The radio stations, popularly called MARKERS, are inseparable from the non-Directional Beacon (NDB)/Locator (L) radio beacons. It is used to signal the flight of a certain point or station. Their long-standing representative, used in the Warsaw Pact air force, was the MRM-48.
It was part of the landing systems OSP-48 and [url = http : //forum.valka.cz] SP-50[/url], but also for other instrument landing systems PRMG-4, PRMG-5.
The beacon function was ensured by a transmitter operating at a frequency of 75 MHz (& # 955; = 4 m), an automatically keyed group of 2 dashes or 6 dots per second, by eliminating electromagnetic waves with a vertically oriented directional diagram in the form of a "flattened funnel". This is ensured by an antenna system with double 1/2 wave dipoles, oriented in the extended axis VPD and a reflector ("mirror"), formed in the stationary design by a metal network 6.15 mx 4.1 m, in the mobile set then folded, formed by a beam with dipoles and sheet metal perforated "wings" in the frame. (During transport it is folded in half (like a book) and stored on the roof of the vehicle of the supply radio station PAR-3, PAR-7 , PAR-8.
For PAR-9, there is only a dipole beam and the reflector is the roof of the vehicle UAZ-452 ).
The power of the transmitter is 12W, power supply 220V/50 Hz, power consumption 500VA. Range min. 2000
The flight of the aircraft over the lighthouse is signaled on board acoustically (bell) and optically (flashing control light).
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His "successor" became the type E-615, mounted in sets of supply radios PAR-9 of later production series, but especially in sets PAR-10 (and upgraded = automated versions of PAR-8) In MS. Air Force, since 1986, along with the introduction of TDV transmitters, was deployed "domestic" type MKR-01 and later MKR-03.
Source: MNO regulation "Systems and means of RTZ" Let-51-70, I. edition 1967 and II. 1982 edition
URL : https://www.valka.cz/SOV-MRM-48-navestni-radiovy-majak-t63678#227236
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Photo from own archive
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Vysílač MRM-48
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Mobilní anténa MRM-48
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Stacionární anténa MRM-48
URL : https://www.valka.cz/SOV-MRM-48-navestni-radiovy-majak-t63678#292053
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Photo SHARK - Pavel Vanek
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Pohled na další verzi antény MRM-48 (na střeše UAZu) PAR-9
URL : https://www.valka.cz/SOV-MRM-48-navestni-radiovy-majak-t63678#292054
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Photo illustration - so antenna molecules system MRM-48 in the transport position on the roof of the car ZiS-151 (PAR-3) and ZiL-130 (PAR-8).