FCC 80.773 Revised as of October 1, 2006
Goto Year:2005 |
2007
Sec. 80.773 Co-channel interference protection.
(a) Where a VHF public coast station geographic area licensee shares a
frequency with an incumbent VHF public coast station licensee, the ratio of
desired to undesired signal strengths must be at least 12 dB within the
service area of the station.
(b) Where a VHF public coast station geographic area licensee shares a
frequency with an incumbent private land mobile radio licensee, the VHF
public coast station geographic area licensee must provide at least 10 dB
protection to the PLMR incumbent's predicted 38 dBu signal level contour.
The PLMR incumbent's predicted 38 dBu signal level contour is calculated
using the F(50, 50) field strength chart for Channels 7–13 in Sec. 73.699 (Fig.
10a) of this chapter, with a 9 dB correction factor for antenna height
differential, and is based on the licensee's authorized effective radiated
power and antenna height-above-average-terrain.
(c) VHF public coast station geographic area licensees are prohibited from
exceeding a field strength of +5 dBu (decibels referenced to 1 microvolt per
meter) at their service area boundaries, unless all the affected VHF public
coast station geographic area licensees agree to the higher field strength.
[ 63 FR 40065 , July 27, 1998, as amended at 64 FR 26887 , May 18, 1999]
Subpart Q [Reserved]
Subpart R—Compulsory Radiotelephone Installations for Vessels 300 Gross Tons
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