Os 4826 Brno hl. n.–Třebíč
854.006-4 | Brno-Horní Heršpice–Brno-Starý Lískovec | 25. 8. 2023 by Tomáš Hynčica
© Tomáš Hynčica, all rights reserved.
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Os 4826 Brno hl. n.–Třebíč
Sp 10873 Nesovice–Otrokovice
Os 4153 Brno hl. n.–Kyjov
Setkání generací v podobě Krokodýla 851.005-9 a jeho nástupce Hydry 854.013-0.
The weather has finally been lovely again today and the cats could enjoy their garden again. Here is Sethi relaxing on the lawn while he was watching Tofu who tried to dig out one of the catnip plants ...
Maruška 854.217 s osobním vlakem 16234 se právě vynořila z Dolnopolubenského tunelu, který se nachází mezi dopravnou D3 Dolní Polubný a zastávkou Desná Riedlova vila (tou dobou ještě zastávka nebyla postavena), tak uveďme pouze stanici Desná. Dolnopolubenský tunel o své délce 166 metrů byl postaven stejně jako celá ozubnicová trať z Tanvaldu do Kořenova v roce 1902.
Spěšný vlak 1868 z Trutnova do Kolína byl 12. října 2010 veden motorovým vozem 854.204, přezdívaným Bohunka. Na vlaku měl být však řazen řídicí vůz 954.2 s první třídou.
Hydra na snímku projíždí kolem mechanické předvěsti do Roztok u Jilemnice. Těmto předvěstem se také přezdívalo "lízátko".
Pn 64000 [Třinec - Kladno-Dubí]
KONNECT VHTS will embark the most powerful on-board digital processor ever put in orbit, offering capacity allocation flexibility, optimal spectrum use, and progressive ground network deployment.
Credit: Thales Alenia Space
KONNECT VHTS will embark the most powerful on-board digital processor ever put in orbit, offering capacity allocation flexibility, optimal spectrum use, and progressive ground network deployment.
Credit: Thales Alenia Space
Čas od času projede po malebné trati vedoucí kolem Ještědsko-kozákovského hřbetu a v podhůří Lužických hor nákladní vlak směřující z Liberce do Děčína. Nejinak tomu bylo i v pátek 10. června 2022, kdy se ložené soupravy o počtu dvaceti cisternových vozů zhostila dvojice lokomotiv 753.615+617. Na fotogenicky známém viaduktu Novina se přes 1800 tun těžkého vlaku zhostila ještě postrková dvojice catrů 753.756+772, ukrývající se na snímku v útulné, stejnojmenné čekárně. Pn 53050 (Liberec - Děčín - Rotterdam-Botlek).
This satellite mockup, seen during antenna testing, shows the shape of ESA’s new Proba-V Companion CubeSat, which is due for launch at the end of this year.
The mission is a 12-unit ‘CubeSat’ – a small, low-cost satellite built up from standardised 10-cm boxes. It will fly a cut-down version of the vegetation-monitoring instrument aboard the Earth-observing Proba-V to perform experimental combined observations with its predecessor.
A pair of antennas for the CubeSat, mounted in this ‘structural and thermal model’ underwent testing at ESA’s Compact Antenna Test Range at the ESTEC technical centre in the Netherlands.
“The white patch is a directional high-data rate antenna, needed to downlink large amounts of imagery to users,” explains Xavier Collaud of Aerospacelab in Belgium, developing the mission for ESA. “Then the brown patch is an omnidirectional antenna, that – combined with a similar antenna on the other side – allows the reception and transmission of lower-data rate signals in any direction, enabling the control of the mission.
“These antennnas are commercial off the shelf equipment, allowing the building up of small satellites in an affordable, modular manner. They are supplied by Syrlinks, in partnership with ANYWAVES, both in France.
“Testing the antennas in the fully controlled environment of ESA’s CATR gives us the sensitivity we need for top-quality results. We’ve been testing with the antennas mounted within this satellite model because its structure influences the antenna radiation – so for instance we’ve been measuring the signal patterns and strength with the solar panels stowed as well as deployed, to make sure we can communicate with the CubeSat in that configuration.”
Launched in 2013, Proba-V was an innovative a ‘gap filler’ mission between the Vegetation instruments monitoring global plant growth aboard the full-size Spot-4 and -5 satellites and compatible imagery coming from Copernicus Sentinel-3, the first of which flew in 2016.
By combining the views from three adjacent telescopes into one, Proba-V’s Vegetation achieved a continent-spanning swath of 2250 km, allowing to image the entire world’s plant growth in just over a day. But with its operational mission now over, Proba-V has shifted to experimental mode.
As part of that effort, the Proba-V Companion CubeSat will host a single telescope version of the Vegetation imager, left over from Proba-V development. The two missions will perform joint observations, to evaluate how well the instrument performs on a smaller, lower-cost platform.
Aerospacelab will also gain operational experience to be applied to its planned constellation of geospatial-information-gathering small satellites.
“The antenna test campaign took about two weeks,” adds ESA antenna engineer Eric Van Der Houwen. “We obtained spherical near-field patterns of the antennas, both individually and in combination, to measure how much they radiate and in which directions, having begun with a reference antenna in order to determine our setup was optimal.”
Based on the antenna test results, as well as mechanical testing performed with another CubeSat model, the Proba-V Companion CubeSat mission has now entered its detailed qualification and production ‘Phase D’, on track for launch this year. The mission is supported through the Fly in-orbit testing element of ESA’s General Support Technology Programme.
Credits: ESA-P. de Maagt
ESA’s Compact Antenna Test Range at its ESTEC technical centre in Noordwijk, the Netherlands. This anechoic chamber is used to test space antennas of 1 m across or less, or else entire small satellites.
The CATR is screened against external electromagnetic radiation, while their inside walls is covered with pyramid-shaped non-reflective foam to absorb signals and prevent unwanted reflections, mimicking infinite space.
In addition, a pair of wall-mounted parabolic cylindrical aluminium reflectors alter the shape of signals as they reflect them, as if they have travelled thousands of kilometres instead of a handful of metres.
The CATR is supplemented by the larger Hybrid European RF and Antenna Test Zone (HERTZ) for larger antenna or satellite testing, as well as a lab for the testing of candidate antenna materials.
Credits: ESA-G. Porter
Dubová Lhota - Úborsko; Pn 67952; 753.773+774
