Channel Sharing Arrangement

A channel sharing arrangement (CSA) is a by-product of the spectrum incentive auction. A station agrees to sell its frequency in the auction and shut down its transmission on its given physical frequency and transmit on the physical frequency of a subchannel of another station ("sharing" the frequency) while retaining their virtual channel (their original analog number) for display purposes. The most noted instance is NBC's New York City flagship WNBC/channel 4, which sold its digital channel 28 in the auction and will shut that channel off when repacking (the realigning of digital channels) begins. WNBC will share transmissions with sister station WNJU/channel 47 (digital 36--to be 35, Linden, N.J. city of license) while keeping its virtual channel 4.

Other examples:

Market	Selling station	Digital Channel	Sharing station	Digital Channel	Notes
New York City, N.Y.	4 WNBC	28	47 WNJU	36	WNJU to repack to 35
Boston, Mass.	56 WLVI	42	7 WHDH	41	Relocation effected; to repack to 35
Charlotte, N.C.	55 WMYT	25	46 WJZY	25	Relocation affected
Philadelphia, Pa.	35 WPPT	9	60 WBPH	9	Relocation affected; WLVT/ch. 39 also sharing
Greenville, S.C.	62 WYCW	45	7 WSPA	7	WSPA to repack to 11
	49 WRET	47	29 WNTV	9	WNTV to repack to 8
Washington, D.C.	20 WDCA	36	5 WTTG	36	Relocation affected
	68 WJAL	39	9 WUSA	9	Relocation effected
Los Angeles, Calif.	50 KOCE	18	18 KSCI	18	Relocation affected