Weekly Tech Reminders: C Band, Time Change & More

An excerpt from this week’s Monday Morning Coffee and Technical Notes
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The following is excerpted from the Alabama Broadcasters Association's weekly e-newsletter, Monday Morning Coffee and Technical Notes. Thanks to Larry Wilkins, who puts together the content and has shared it with Radio magazine readers. To subscribe to the newsletter, send an email to lwilkins@al-ba.com, and he will add you to the database.

C-BAND DOWNLINK REGISTRATION

As a reminder the deadline to register your C-band downlink has been extended to Oct. 31. This is very important to ensure that the FCC is aware of how much this frequency spectrum is used by all radio, television and cable operations.

DAYLIGHT SAVING TIME ENDING SOON

DST will come to an end in just a couple of weeks. This year it occurs on Sunday November 4 at 2 a.m. This means 2 a.m. clocks are turned backward one hour to Sunday, Nov. 4, 1 a.m. local standard time instead.

Sunrise and sunset will be about 1 hour earlier on Nov 4, 2018 than the day before. There will be more light in the morning.

ATSC 3.0 UPDATE

At NAB Show New York this week, executives from Fox Television Stations; NBC and Telemundo Owned Stations Group; Univision; TEGNA, Inc. (for Pearl TV), and Nexstar Media Group (for SpectrumCo) announced their collaborative effort and support for the introduction of ATSC 3.0 (aka Next Gen TV).

UNDERSTANDING IGMP

The Internet Group Management Protocol is the standard IP multicast group membership protocol.

Hosts on a given subnetwork need to inform their routing device only whether or not they are interested in receiving packets from a certain multicast group. The source host needs to inform its routing devices only that it is the source of traffic for a particular multicast group.

The Internet Group Management Protocol manages the membership of hosts and routing devices in those multicast groups. A routing device receives explicit join and prune messages from those neighboring routing devices that have downstream group members.

FM TRANSLATOR RULES

If you are involved in installing or maintaining a FM translator, here some of the more important rules to remember.

  • The maximum effective radiated power for any translator station is 250 watts.
  • If the translator is a fill-in translator, the ERP may be further limited by the need to maintain the translator's service contour within the primary station's service contour. Composite antennas and antenna arrays may be used.
  • A commercial fill-in translator may receive a primary station's signal via any terrestrial transmission method, including (but not limited to) microwave, phone, internet, and dedicated fiber optic cable.
  • An FM translator station rebroadcasting the signal of an AM or FM primary station shall not be permitted to radiate during extended periods when signals of the primary station are not being retransmitted. FM translators rebroadcasting Class D AM stations may continue to operate during nighttime hours only if the AM station has operated within the last 24 hours. (74.1263(b))
  • If the translator site cannot be reached at all hours and all seasons, means shall be provided so that the transmitting apparatus can be turned on and off at will from a point that is readily accessible during all hours and all seasons.

For complete FCC rules concerning translator and/or booster, visit section 74.1201 of the FCC rules.

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