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A
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What is GPS ?
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B
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What kind of GPS antenna is right for my receiver ?
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C
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LTE 4G Frequency band allocations.
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A. What is GPS?
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Global Positioning System. A space-based radio positioning system that provides GPS receiver users with accurate position, velocity, and time data. GPS provides this data free of direct user charge worldwide, continuously and under all weather conditions. The GPS constellation consists of 24 orbiting satellites, with four equally spaced around each of six different orbital planes. The systems is developed by the USA Department of Defense under US Air Force management, primarily for military purposes, but current policy calls for civil availability with degradation in system accuracy to protect U.S. national security interests.
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B. What kind of GPS antenna is right for my receiver?
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Check your vendors' GPS manual for antenna specification to see if it requires a HIGH or Medium gain external antenna and check if it has a +5VDC or +3VDC supply at the center pin to your external ACTIVE antenna.
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Frequency Allocation-United States
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Communication System
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Traffic Channel
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Radiation
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Receiver
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GSM 850
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128
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824.2
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869.2
|
|
189
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836.4
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881.4
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|
190
|
836.6
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881.6
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|
251
|
848.8
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893.8
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GSM 900
|
975
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880.2
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925.2
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|
985
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882.2
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927.2
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1
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890.2
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935.2
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30
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896
|
941
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37
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879.4
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942.4
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38
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897.6
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942.6
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62
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902.4
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947.4
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124
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914.8
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959.8
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Amateur radio
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1240
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1300
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DCS
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512
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1710.2
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1805.2
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699
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1747.6
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1842.6
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700
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1747.8
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1842.8
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750
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1757.8
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1852.8
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885
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1784.8
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1879.8
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PCS
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512
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1850.2
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1930.2
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660
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1879.8
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1959.8
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661
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1880
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1960
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810
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1909.8
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1989.8
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CDMA2000AMPS
|
991
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824.01
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869.01
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384
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836.52
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891.52
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|
799
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848.97
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903.97
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CDMA2000PCS
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25
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1851.25
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1931.25
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600
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1880
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1960
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1175
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1908.75
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1988.75
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WCDMA
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9613/10563
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1922.6
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2112.6
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9750/10700
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1950
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2140
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9887/10837
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1977.4
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2167.4
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A brief summary of some UHF frequency usage:
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Frequency
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Usage
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300~420 MHz
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Government use, including meteorology
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420~450 MHz
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Radiolocation and Amateur radio (70cm band)
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450~470 MHz
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UHF business band, GMRS, and FRS 2-way
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470~512 MHz
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TV channels 14-20, public safety
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512~698 MHz
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TV channels 21-51
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698~806 MHz
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TV channels 52-69 (to be auctioned for other uses once conversion to digital TV has been accomplished
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806~824 MHz
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Pocket pagers and Nextel SMR band
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824~849 MHz
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Cellular phones, A&B franchises, mobile phone
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849~869 MHz
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Public safety 2-way (fire, police, ambulance)
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869~894 MHz
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Cellular phone, A&B franchises, base station
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902~928 MHz
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ISM band: cordless phones and stereo, FRID, data links, Amateur radio (33cm band)
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928~960 MHz
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Mixed Studio-Transmitter link, mobile 2-way, other
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1240~1300 MHz
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Amateur radio (23 cm band)
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1850~1910 MHz
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PCS mobile phone-note below
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1930~1990 MHz
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PCS base stations-notes below
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Note: order is A, D, B, E, F, C blocks. A, B, C=15 MHz; D, E, F=5 MHz
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2310~2360 MHz
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Satellite radio (Sirius and XM)
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2390~2450 MHz
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Amateur radio (13cm band)
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2400~2483.5 MHz
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ISM, IEEE 802.11, 802.11b, 802.11g Wireless LAN
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Around 2450 MHz
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Microwave oven
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C. LTE 4G Frequency band allocations.
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