FAQ

A What is GPS ?
B What kind of GPS antenna is right for my receiver ?
C LTE 4G Frequency band allocations.
 
A. What is GPS?
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.
B. What kind of GPS antenna is right for my receiver?
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.


Frequency Allocation-United States

Communication System Traffic Channel Radiation Receiver
GSM 850 128 824.2 869.2
189 836.4 881.4
190 836.6 881.6
251 848.8 893.8
GSM 900 975 880.2 925.2
985 882.2 927.2
1 890.2 935.2
30 896 941
37 879.4 942.4
38 897.6 942.6
62 902.4 947.4
124 914.8 959.8
Amateur radio   1240 1300
DCS 512 1710.2 1805.2
699 1747.6 1842.6
700 1747.8 1842.8
750 1757.8 1852.8
885 1784.8 1879.8
PCS 512 1850.2 1930.2
660 1879.8 1959.8
661 1880 1960
810 1909.8 1989.8
CDMA2000AMPS 991 824.01 869.01
384 836.52 891.52
799 848.97 903.97
CDMA2000PCS 25 1851.25 1931.25
600 1880 1960
1175 1908.75 1988.75
WCDMA 9613/10563 1922.6 2112.6
9750/10700 1950 2140
9887/10837 1977.4 2167.4


A brief summary of some UHF frequency usage: 

Frequency Usage
300~420 MHz Government use, including meteorology
420~450 MHz Radiolocation and Amateur radio (70cm band)
450~470 MHz UHF business band, GMRS, and FRS 2-way
470~512 MHz TV channels 14-20, public safety
512~698 MHz TV channels 21-51
698~806 MHz TV channels 52-69 (to be auctioned for other uses once conversion to digital TV has been accomplished
806~824 MHz Pocket pagers and Nextel SMR band
824~849 MHz Cellular phones, A&B franchises, mobile phone
849~869 MHz Public safety 2-way (fire, police, ambulance)
869~894 MHz Cellular phone, A&B franchises, base station
902~928 MHz ISM band: cordless phones and stereo, FRID, data links, Amateur radio (33cm band)
928~960 MHz Mixed Studio-Transmitter link, mobile 2-way, other
1240~1300 MHz Amateur radio (23 cm band)
1850~1910 MHz PCS mobile phone-note below
1930~1990 MHz PCS base stations-notes below
Note: order is A, D, B, E, F, C blocks. A, B, C=15 MHz; D, E, F=5 MHz
2310~2360 MHz Satellite radio (Sirius and XM)
2390~2450 MHz Amateur radio (13cm band)
2400~2483.5 MHz ISM, IEEE 802.11, 802.11b, 802.11g Wireless LAN
Around 2450 MHz Microwave oven

C. LTE 4G Frequency band allocations.