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Each satellite uses a unique PRN code, which does not correlate well with any other satellite's PRN code. In other words, the PRN codes are highly orthogonal to one another. The 1 ms period of the C/A code corresponds to 299.8 km of distance, and each chip corresponds to a distance of 293 m.
If there are two different PRN and IMS Radio affiliates in a market, the IMS Radio affiliate retains the contractual right of first refusal. As of 2017, the broadcast is carried on over 350 terrestrial radio affiliates, shortwave (AFN and World Harvest Radio), satellite radio , online streaming, and podcast. [17]
All PRN shows with the exception of all race broadcasts and the pre and post race shows originate from Performance Racing Network's studios at Charlotte Motor Speedway. All PRN race broadcasts are available via Sirius XM NASCAR Radio. Fast Talk is also carried on Sirius XM NASCAR Radio on Wednesdays at 10:00 p.m. eastern time.
IndyCar Radio Network: Covers the Xfinty Series and NASCAR Cup Series races at the Indianapolis Motor Speedway. It is produced in a joint venture with PRN. From 2002 to 2006, all races were heard on XM channel 90 across the continental United States. In 2007, national satellite radio rights moved to Sirius channel 90.
Motor Racing Network (MRN) is an American radio network that syndicates broadcasts of auto racing events, particularly NASCAR. MRN was founded in 1970 by NASCAR founder Bill France, Sr. and broadcaster Ken Squier , and is a wholly owned subsidiary of NASCAR.
The satellite network uses a CDMA spread-spectrum technique [167]: 607 where the low-bitrate message data is encoded with a high-rate pseudo-random (PRN) sequence that is different for each satellite. The receiver must be aware of the PRN codes for each satellite to reconstruct the actual message data.
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Following in orbit testing, Eutelsat 117 West B, broadcasting signal on PRN 131 (NMEA #44), was certified as operational and made available for navigation on March 27, 2018. The SES 15 satellite was launched on May 18, 2017, and following an in-orbit test of several months, was set operational on July 15, 2019.