![]() ![]() ġ30.167 AM VHF-2 Downlink from Zarya (Service Module). Downlink 145.800, generally Pd 120 modeġ21.125 FM RS EVA from Orlan suit ġ21.75 FM Downlink from Soyuz-TM (voice).Downlink 437.800MHz FM Doppler +-10KHzĪX.25 1200 Bd AFSK Packet Radio, Worldwide.He may be reached at +1 (281) 317-1397 or by email at Radio Frequencies – please note: only one mode active at a time *** Current Status of ISS Stations ***įM VOICE for ITU Region 1: Europe-Middle East-Africa-North AsiaįM VOICE for ITU Region 2&3: North and South America-Caribbean-Greenland-Australia-South Asia Raul Magallanes runs a Houston-based law firm focusing on telecommunications law. No one should be discouraged from making extended Ku-band part of their network plans, however, if you intend to use extended Ku-band, you should plan accordingly for dealing with all of the restrictions and contingencies that might come with it. This is the 13.75–13.80 GHz segment used by the Tracking and Data Relay Satellite System (TDRSS), a space-to-space link operated by NASA, and users intending to use this 50MHz slot also must coordinate with the space agency.Įxtended Ku-band increases space segment availability, promotes satellite efficiency, and makes better use of scarce orbital slots. There is a 50MHz uplink slot in extended Ku-band that deserves particular attention. On top of that, RF equipment must be specially outfitted to operate in extended Ku-band. Other restrictions in the extended Ku-band include a minimum Earth station diameter of 4.5 meters as well as limitations on transmit power. Accordingly, it would have to be priced attractively, or there would have to be few other options for you to agree to buy it. ![]() Returning to the analogy of the not-so-prime real estate, think of extended Ku-band as buying a parcel of land with an easement through the middle of the property. Rather, it is a lengthy and time-consuming process requiring the performance of certain technical studies. In fact, radiolocation services in this band primarily are government sites, and frequency coordination with the government is not known for lightning speed. A satellite that can offer more bandwidth is more efficient because its cost per channel decreases.īecause fixed satellite and radiolocation services have co-primary rights, a downside of extended Ku-band is that frequency coordination is necessary. There also was the idea that if a satellite was to be in orbit using a scarce geostationary arc slot, it might as well be used to provide all possible services. #Uplink vs downlink frequency drivereconomic growth by making its satellites more competitive in the international arena was a primary driver for the extended Ku-band allocation. International satellites had been offering services in the extended Ku-band for years and, thus, provided options not available from U.S. global competitiveness and the efficient use of resources were the primary rationale. Why allocate additional spectrum to the extended Ku-band? One reason was to balance the uplink and downlink, however, U.S. Rationale for Extended Ku-Band Allocation Now, FSS players share this band with radiolocation on a co-primary basis. This part of the electromagnetic spectrum traditionally was allocated to radiolocation services (i.e., finding the position of something through radio waves). The uplink portion rests in the 13.75-14.0GHz segment. Federal Communications Commission (FCC) allocated uplink bandwidth to fixed satellite services in extended Ku-band. This changed in the mid-1990s when the U.S. In fact, for a long time, only the downlink had an extended component, with no corresponding extended bandwidth on the uplink. Extended Ku-band is not quite so symmetrical. ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |