Composite Transmission Under Part 94

Composite Transmission Under Part 94

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Given the current frequency congestion in most metropolitan areas of the United States, it has become very difficult to transmit programs using established Part 74 RF frequencies.

Organizations considering fixed point-to-point transmission of high quality programs may benefit from frequency assignments under Part 94 of the FCC Rules. Part 94 allows transmission of program material provided that the operational-fixed frequencies do not serve as the final link in the chain of distribution of the program material to broadcast stations.

There are 25 pairs of frequencies available for 50 kHz band-widths, 32 pairs of frequencies available for 100 kHz bandwidths, and 6 pairs of frequencies available for 200 kHz bandwidths. Stations in this service are authorized any type of emission, method of modulation, and transmission characteristic consistent with efficient use of the spectrum and good engineering practice except that Type B damped-wave emission is not authorized.

The technical requirements for equipment are as follows:

Frequency Band: 952-960mhz
Max. Power Allowed: 20W (fixed)
Frequency Tolerance: .0005%

The antenna standards require a Category C antenna with max. 3 dB bandwidth of 14 degrees. There are no minimum path length requirements for these links. The Moseley PCL 6000 Series equipment is type notified for Part 94 applications and can be used for transmitting monaural or composite (200 kHz bandwidth only) programs.

Part 94 opens up new possibilities for back hauling satellite programming and/or remote pickup feeds. Other possibilities include program quality monitoring, remote control data and operational communications.

Moseley has had extensive experience in narrow bandwidth composite transmission. The excellent selectivity of the Moseley PCL 6000 receivers make them an ideal choice for narrow band congested environments.