Space Communications
By admin
Space Communications
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 Djibouti 1980 Space Communications Imp Corner Block 4 $24.90 Time Remaining: 11h 12m |
 Russia Soviet Space Communications 1965 Souvenir Sheet $2.99 Time Remaining: 29d 20h 47m Buy It Now for only: $2.99 Buy It Now |
 Armenia 2011 Communication s s MNH $1.99 Time Remaining: 8d 12h 53m Buy It Now for only: $1.99 Buy It Now |
 JAPAN 8 DIFF COMMEMOSTAMPS ON SPACE ASTRONOMY COMMUNICATIONSFU $1.99 Time Remaining: 14h 20m |
 Algeria 1975 Satellite Communications VF MNH 542 4 $1.97 Time Remaining: 25d 20h 18m Buy It Now for only: $1.97 Buy It Now |
 Somali Coast C40a Space Communications 1v Pair in Date Trial Color Proof Block $148.50 Time Remaining: 29d 17h 25m Buy It Now for only: $148.50 Buy It Now |
 Nicaragua 1987 Space Communications 7v Imperf Proofs $59.00 Time Remaining: 15h 29m |
 SPACE 1 16 64 USNS KINGSPORT SATELLITE COMMUNICATIONS SHIP $12.00 Time Remaining: 24d 11m Buy It Now for only: $12.00 Buy It Now |
 Fujeira 1966 Space Communications8vCornerBlocks of4 $16.35 Time Remaining: 9d 18h 19m Buy It Now for only: $16.35 Buy It Now |
 SPACE communications lot of mostly MNH stampslow sta $9.99 Time Remaining: 18h 37m |
 Yemen Republic MI 1725 30 Space Communications 6v $16.35 Time Remaining: 9d 18h 19m Buy It Now for only: $16.35 Buy It Now |
 Comoros 1976 Space Telephone Communications 6v o p $11.88 Time Remaining: 9d 17h 5m Buy It Now for only: $11.88 Buy It Now |
 Ship Communication unique crossgutter Rwanda 967275 $21.99 Time Remaining: 19h 34m Buy It Now for only: $24.95 Buy It Now |
 Austria 1980 Space Communications 1v on 3 Different Cacheted FDC $7.90 Time Remaining: 18d 18h 13m Buy It Now for only: $7.90 Buy It Now |
 Yemen Rep MI BL222 23Space Communications 2v S S $22.90 Time Remaining: 1d 10h 33m |
 Colombia 1965 1973 Space Communications 10v on 4 Different FDC $22.90 Time Remaining: 6d 18h 8m Buy It Now for only: $22.90 Buy It Now |
 Austria 1970 Apollo 13 Space Communications CDS $13.35 Time Remaining: 9d 17h 17m Buy It Now for only: $13.35 Buy It Now |
 French Africa Communications Space 22v on 16 FDC $24.90 Time Remaining: 1d 10h 38m |
 1173 Plate block 4cent Communications for Peace Echo 1 space exploration moon $0.99 Time Remaining: 6d 12h 32m Buy It Now for only: $0.99 Buy It Now |
 Belgium 1971 + 1972 Space Communications 2v Maximum Card FDC $9.90 Time Remaining: 9d 14h 32m Buy It Now for only: $9.90 Buy It Now |
 MNH British Niuafoou Tonga Space and Communication Souvenir Sheet Free Shipping $1.44 (6 Bids) Time Remaining: 1d 22h 7m |
 Russia 1981 Sc4978 Svyaz Intl Communication Exhib Blk $1.00 Time Remaining: 20d 4h 35m Buy It Now for only: $1.00 Buy It Now |
 Mexico 1982 Doves Space Bird Ship Radio Plane Sun Communications 1v n24963 $1.58 Time Remaining: 22d 22h 8m Buy It Now for only: $1.58 Buy It Now |
 SPACE TELSTAR 3 COMMUNICATIONS SATELLITE COLORANO COVER $0.99 (1 Bid) Time Remaining: 2d 23h 29m |
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 Dubai 143 Soccer Communications Television Space 1v Imprint Block of 25 $223.50 Time Remaining: 24d 14h 14m Buy It Now for only: $223.50 Buy It Now |
 FRANCE 1964 PHILATEC PARIS M S of 8 MNH SPACE HORSES COMMUNICATIONS CV16000 $69.95 Time Remaining: 3d 14h 41m |
 COOK ISLANDS 1983 WCY COMMUNICATIONS OMNIBUS SPACE MNH $5.14 Time Remaining: 12d 16h 8m Buy It Now for only: $5.14 Buy It Now |
 QATAR 1965 ITU UIT complete SET SC61 68 MNH SPACE COMMUNICATIONS $14.95 Time Remaining: 3d 14h 59m |
 Italy 1968 Space Communications 1v Block of 4 on 1 FDC to Milan $5.90 Time Remaining: 9d 11h 53m Buy It Now for only: $5.90 Buy It Now |
 Russia 1993 Communication Satellite S S MNH $1.51 Time Remaining: 1d 15h 5m Buy It Now for only: $1.51 Buy It Now |
 MNH British Tonga Space and Communication Souvenir Sheet Free Shipping $0.60 (6 Bids) Time Remaining: 3d 15h 37m |
 1972 cover Apollo 16 NASA Communications Station Honolulu Hawaii signed $5.00 Time Remaining: 19d 15h 58m Buy It Now for only: $5.00 Buy It Now |
 Liberia 415 17 C162 MNH Complete Space Communication $2.00 Time Remaining: 24d 14h 52m Buy It Now for only: $2.00 Buy It Now |
 SPACE COVER 25TH ANNIV EUROPA SPACE COMMUNICATIONS 1ST DAY ISSUE260 $4.50 Time Remaining: 3d 21h |
 Telescope Communication World 971722 $3.50 Time Remaining: 3d 17h 57m Buy It Now for only: $3.50 Buy It Now |
 Russia 1981 Space Communications 1v Registered Postal Stationery CDS with Stamps $6.90 Time Remaining: 9d 12h 20m Buy It Now for only: $6.90 Buy It Now |
 1193 ON TELSTAR I COMMUNICATIONS SATELLITE COVER JUL 10 1962 W CARD $0.10 (1 Bid) Time Remaining: 3d 21h 3m |
 Zaire 1984 Space Communications Bird Bus Ship 7v b9301 $10.99 Time Remaining: 24d 8h 24m Buy It Now for only: $10.99 Buy It Now |
 KOREA NORTH 1976 ITU COMMUNICATIONS TELEPHONE SHIPS SPACE DELUXE MNH $7.12 Time Remaining: 29d 6h 34m Buy It Now for only: $7.12 Buy It Now |
 Mali 1982 Sputnik Space Communications 1v Imperf Pair $18.90 Time Remaining: 4d 13h 20m |
 Cameroun 1963 ITU UN Space Communications 4v on FDC $9.90 Time Remaining: 9d 14h 26m Buy It Now for only: $9.90 Buy It Now |
 Saint Pierre 1965 ITU UN Communications Space 1v on FDC $18.90 Time Remaining: 4d 13h 37m |
 Mali 423 ITU UN Space Communications 1v D S $14.59 Time Remaining: 9d 17h 42m Buy It Now for only: $14.59 Buy It Now |
 Upper Volta 471 ITU Communications Space 1v Imperf $13.35 Time Remaining: 9d 17h 25m Buy It Now for only: $13.35 Buy It Now |
 Togo 1042 C402 Communications Space 2v Deluxe Sheets $16.90 Time Remaining: 4d 13h 46m |
 Upper Volta Space Communications 1V Imperf $9.90 Time Remaining: 9d 14h 21m Buy It Now for only: $9.90 Buy It Now |
 Mali 1981 Space Communications Deluxe Sheet $11.25 Time Remaining: 9d 15h 29m Buy It Now for only: $11.25 Buy It Now |
 MONGOLIA 1965 ITU UIT COMMUNICATIONS S S imperf SPACE GLOBE $1.95 Time Remaining: 4d 14h 11m |
 Mali 1981 Space Communication Imperf Block 4 $28.35 Time Remaining: 10d 11h 37m Buy It Now for only: $28.35 Buy It Now |
 France 1965 Space Communications 1v Maximum Card FDC $9.09 Time Remaining: 9d 13h 25m Buy It Now for only: $9.09 Buy It Now |
 Liberia 415 417C162MNHCommunications 1964Satellites $4.21 Time Remaining: 4d 23h 16m |
 US Space FDC Cover 1960 Communications Satellite Echo 1 $4.50 Time Remaining: 20d 17h 49m Buy It Now for only: $4.50 Buy It Now |
 Gabon 1963 Space Communications VF MNH 167 8 $2.37 Time Remaining: 4d 21h 5m Buy It Now for only: $2.37 Buy It Now |
 Mauritania C23 C24MNHMichel 217 218 Communication through Space1963 $3.51 Time Remaining: 4d 23h 19m |
 Greece 1970 Space Communications Maps 2v on 1 FDC $5.90 Time Remaining: 9d 11h 59m Buy It Now for only: $5.90 Buy It Now |
 Nicaragua 1129 1132C989 C991MNH Space Communications1981SatellitesGlobe $3.92 Time Remaining: 4d 23h 21m |
 Cambodia 1965 ITU UIT Telecomms Communications Radio Space 3v set n33568 $2.29 Time Remaining: 10d 15h 30m Buy It Now for only: $2.29 Buy It Now |
 Chad 1984 Communications Ship Jet Satellite VF MNH 505 9 $4.27 Time Remaining: 19h 48m Buy It Now for only: $4.27 Buy It Now |
 Russia 3195MNH Communication satellite Molniya 11966 $0.99 Time Remaining: 4d 23h 28m |
 Djibouti C137 Space Communications 1v Imperf NH $9.90 Time Remaining: 16d 14h 24m Buy It Now for only: $9.90 Buy It Now |
 Monaco 1962 Telstar Space Communications 1v n32322 $1.58 Time Remaining: 23d 9h 34m Buy It Now for only: $1.58 Buy It Now |
 Russia 3358lightly hingedMichel 3378 Communications in USSR1967Satellites $1.42 Time Remaining: 4d 23h 28m |
 Germany 1981 Space Communications Postal Card + Reply Card Both Canceled FDC $7.90 Time Remaining: 19d 18h 11m Buy It Now for only: $7.90 Buy It Now |
 Congo 1963 Space Communications VF MNH 106 7 $1.77 Time Remaining: 15d 19h 6m Buy It Now for only: $1.77 Buy It Now |
 Russia 3358MNHMichel 3378 Communications in USSR1967Satellites $2.35 Time Remaining: 4d 23h 28m |
 Djibouti 1981 Space Communications 1v Imperf Block 9 $58.50 Time Remaining: 25d 15h 36m Buy It Now for only: $58.50 Buy It Now |
 Guyana 1380 Space Communication Block of 4 $14.59 Time Remaining: 9d 17h 37m Buy It Now for only: $14.59 Buy It Now |
 Russia 3543 ac sheetMNHMichel 3568 3570 Bl53 Communications via Satellite $2.99 Time Remaining: 4d 23h 28m |
 Djibouti Space Communications Imperf Pair $23.06 Time Remaining: 10d 11h 24m Buy It Now for only: $23.06 Buy It Now |
 Russia 6138 61426143MNHMichel 301 305306 Bl4Communications Satellites1993 $4.68 Time Remaining: 4d 23h 33m |
 1556 Plate block 10cent Pioneer Jupiter Space NASA communication orbit moon mars $2.00 Time Remaining: 27d 11h Buy It Now for only: $2.00 Buy It Now |
 Central Africa C88 Space Communications 1v on FDC $9.00 Time Remaining: 9d 13h 21m Buy It Now for only: $9.00 Buy It Now |
 Russia 6138 6142MNHMichel 301 305 Communications Satellites1993 $2.35 Time Remaining: 4d 23h 33m |
 Iran 2000 Space Satellite Radio Dish Communications Telecomms 2v set b734 $4.67 Time Remaining: 18d 10h 35m Buy It Now for only: $4.67 Buy It Now |
 Congo Space UN Communications Imperf Pair $11.90 Time Remaining: 9d 17h 5m Buy It Now for only: $11.90 Buy It Now |
 Senegal C39MNHMichel 290 Communication through spaceSYNCOM 21964 $2.99 Time Remaining: 4d 23h 34m |
 Cameroun UN Space Communications Imperf Pair $14.85 Time Remaining: 9d 18h 6m Buy It Now for only: $14.85 Buy It Now |
 Gabon UN Space Communication 1V Imperf $11.25 Time Remaining: 9d 15h 29m Buy It Now for only: $11.25 Buy It Now |
 Tonga 545 548MNHMichel 855 858 World Communication Year WCY 1983Intelsat $6.02 Time Remaining: 4d 23h 36m |
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 1529 Plate block 10cent Skylab Space Communication NASA Astronaut Sciece orbit $1.50 Time Remaining: 27d 51m Buy It Now for only: $1.50 Buy It Now |
 1984 ZAIRE SPACE COMMUNICATION SET OF 7 MNH $0.77 Time Remaining: 5d 7h 12m Buy It Now for only: $3.77 Buy It Now |
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 STHELENA 1969 Ships Sailboats MAIL Communications FDC $14.30 Time Remaining: 5d 9h 42m |
 Germany 1965 Space Communications 1v on 2 Different Cacheted FDC $5.90 Time Remaining: 9d 11h 53m Buy It Now for only: $5.90 Buy It Now |
 Senegal 724 7 Space Communications 4v Blocks of 4 $10.50 Time Remaining: 16d 14h 28m Buy It Now for only: $10.50 Buy It Now |
 Australia 431 433 Space Maps Communications 3v NH $7.90 Time Remaining: 5d 14h 39m |
 Belgium 1979 Space Communications 1v Maximum Card FDC $6.90 Time Remaining: 9d 12h 12m Buy It Now for only: $6.90 Buy It Now |
 Yemen Republic 1966 Space Communications8v+S S NH $8.90 Time Remaining: 10d 17h 53m Buy It Now for only: $8.90 Buy It Now |
 Upper Volta Space Communication Imperf Pair $9.90 Time Remaining: 5d 14h 45m |
 Yemen Republic MI 1725 30 Space Communications 6v $10.00 Time Remaining: 9d 14h 43m Buy It Now for only: $10.00 Buy It Now |
 Germany 1986 Space Communications 1v Maximum Card FDC $5.90 Time Remaining: 9d 11h 53m Buy It Now for only: $5.90 Buy It Now |
 MEXICO MNH FIRST LAUNCHING COMMUNICATION SATELLITE 3 STAMPS 2 LABELS $10.00 Time Remaining: 5d 17h 16m |
 China ROC 1969 scott 1637 1639 unused OG Communication Satellite SPACE $2.48 Time Remaining: 19d 43m Buy It Now for only: $2.48 Buy It Now |
 Monaco 1963 Space Communications 1v on FDC $5.90 Time Remaining: 9d 11h 59m Buy It Now for only: $5.90 Buy It Now |
 KENYA 1983 COMMUNICATION YEAR blocks of 4 MNH TRAINS LOCOMOTIVES SPACE CV30 $7.95 Time Remaining: 6d 12h 31m |
 Yugoslavia 1974 Space Communications 2v on 1 FDC $5.90 Time Remaining: 9d 11h 53m Buy It Now for only: $5.90 Buy It Now |
wat type of lights can we ue in FREE SPACE COMMUNICATIONS?
wat type of lights can we ue in FREE SPACE COMMUNICATIONS
i heard of laser,
but can we use microwave ,radio,or infrared in Free space optical communications
if yes then how they are called FSO as
microwave ,radio and infrared waves are not light waves
kindly exlpain it
Actually, radio, microwave, infrared, visible, ultraviolet, x-ray, gamma ray are all electromagnetic waves of increasing frequencies.
What is "free" about free space communications? I suppose you mean communications between things in space outside the earth's atmosphere.
Light (laser, and also infrared, etc.) is often quite directional and may be a problem getting enough signal to the receiver unless there is some complex target tracking system involved. Radio tends to be less directional and thus less sensitive to this issue.
I'd consider your TV remote controller to be something like this. You've got to have a way for the receiver to "see" the light (infrared) from the controller's transmitter LED, because you pointed it or because it bounced off the ceiling or wall or whatever.
In free space there's not a lot to bounce off of!