SPECTRUM ALLOCATION IN THE 902-1240 MHz BAND

 

Frequency Band (MHz)

Allocated Use

FCC Rule Part

 

 

 

902-928(1)

Radiolocation/ISM

ISM Equipment (18)

 

 

Private Land Mobile (90)

 

 

Amateur (97)

 

 

 

928-932(2) (3) (4) (5)

Fixed

Public Mobile (22)         

 

 

Private Land Mobile (90)

 

 

Fixed Microwave (101)

 

 

Personal Communications (24)

 

 

Fixed Microwave (101)

 

 

 

932-935(2) (3)

Fixed

Fixed Microwave (101)

 

 

Public Mobile (22)

 

 

 

935-940(2) (3)

Fixed/Land Mobile

Private Land Mobile (90)

 

 

 

940-941(2) (3) (4) 

Fixed/Mobile

Personal Communications (24)

 

 

 

941-944(2) (3) (6) 

Fixed

Public Mobile (22)

 

 

Fixed Microwave (101)

 

 

 

944-960

Fixed

Public Mobile (22)

 

 

Auxiliary Broadcast (74)

 

 

Fixed Microwave (101)

 

 

 

960-1215(7)

Aeronautical Radionavigation

Aviation (87)

 

 

 

1215-1240(8) (9)

Earth Exploration-Satellite (Active)

 

 

Radiolocation

 

 

Radionavigation-Satellite (Space-to-

 

 

Space Research (Active)

 


 

 

 

Footnotes

 

(1)The band 902-928 MHz is available for Location and Monitoring Service (LMS) systems subject to not causing harmful interference to the operation of all Government stations authorized in these bands. These systems must tolerate interference from the operation of industrial, scientific, and medical (ISM) devices and the operation of Government stations authorized in these bands. The band 902-928 MHz is allocated on a secondary basis to the amateur service subject to not causing harmful interference to the operations of Government stations authorized in this band or to Location and Monitoring Service (LMS) systems. Stations in the Amateur service must tolerate any interference from the operations of industrial, scientific and medical (ISM) devices, LMS systems, and the operations of Government stations authorized in this band. Government fixed and mobile radio services including low power radio control operations, are permitted in the band 902-928 MHz on a secondary basis. In the band 902-928 MHz all Government non-military radiolocation shall be secondary to military radiolocation.

 

(2)In the band 928-942 MHz, the Government radiolocation is limited to the military services.

 

(3)Frequencies in the 928-960 MHz band may be assigned for multiple address systems and mobile operations on a primary basis as specified in Part 94.

 

(4)Narrowband PCS operates in the 901-902 MHz, 930-931 MHz, and 940-941 MHz bands and is licensed based on nationwide, regional, and MTA market designations. The rules governing narrowband PCS are found in the Code of Federal Regulations, Volume 47, Part 24.  Narrowband PCS is used to provide such services as two-way paging and other text-based services. Licensees also use the spectrum to offer wireless telemetry which is the monitoring of mobile or fixed equipment in a remote location.

 

(5)Commercial paging may operate in the 929 and 931 MHz bands.

 

(6)  The Channeling Plan for assignments in this band is shown in Section 4.3.14 of the NTIA Manual.

 

(7)  Government systems utilizing spread spectrum techniques for terrestrial communication, navigation and identification may be authorized to operate in the band 960-1215 MHz on the condition that harmful interference will not be caused to the aeronautical radionavigation service. These systems will be handled on a case-by-case basis. Such systems shall be subject to a review at the national level for operational requirements and electromagnetic compatibility prior to development, procurement or modification. For additional information on the use of this band see: http://www.gb.nrao.edu/electronics/edir/edir313/dme_analysis.ps

 

(8)Government radiolocation in the band 1215-1300 MHz is primarily for the military services; however, limited secondary use is permitted by other Government agencies in support of experimentation and research programs.

 

(9) The GPS satellites transmit on two L-band frequencies: L1 = 1575.42 MHz and L2 = 1227.6 MHz. Three pseudo-random noise (PRN) ranging codes are in use.

  • The coarse/acquisition (C/A) code has a 1.023 MHz chip rate, a period of 1 millisecond (ms) and is used primarily to acquire the P-code.
  • The precision (P) code has a 10.23 MHz rate, a period of 7 days and is the principal navigation ranging code.
  • The Y-code is used in place of the P-code whenever the anti-spoofing (A-S) mode of operation is activated.

The C/A code is available on the L1 frequency and the P-code is available on both L1 and L2. The various satellites all transmit on the same frequencies, L1 and L2, but with individual code assignments.

Due to the spread spectrum characteristic of the signals, the system provides a large margin of resistance to interference. Each satellite transmits a navigation message containing its orbital elements, clock behavior, system time and status messages. In addition, an almanac is also provided which gives the approximate data for each active satellite. This allows the user set to find all satellites once the first has been acquired.

 

 

 

 

ADDITIONAL DATA

 

During GBT commissioning of the Prime Focus receiver (PF2: 900-1240 MHz) July 18-19, 2003, some spectra were taken with the 200 MHz mode of the ACS. Some of these illustrate the RFI situation and are shown here:

 

http://wwwlocal.gb.nrao.edu/~fghigo/rfi_pf1070/pf1070.html