Specifications include, but are not limited to: The antenna shall be constructed to meet the following technical requirements: 2.2.1 The antenna shall be a side mounted slot cylinder based design that operates efficiently on UHF channel 23. The antenna maximum VSWR across channel 23 shall be no more than 1.08:1. Field tuning of the antenna shall not be allowed. 2.2.2 The antenna shall be elliptically polarized with a 30% vertical polarization with respect to the horizontal polarization. 2.2.3 There shall be no external radiating or pattern shaping elements. All pattern shaping elements shall be enclosed within a non‐pressurized cylinder radome that is FAA orange in color. 2.2.4 The antenna shall be designed to structural code RS‐222G. 2.2.5 The antenna shall mount directly to the side of the existing tower. L.E.T.A shall supply whatever information they have about the tower, but it shall be the responsibility of the Contractor to obtain or confirm the information needed regarding the tower top. The antenna shall include all required mounting hardware. 2.2.6 The antenna shall have a medium cardioid azimuth pattern with a horizontal pole azimuth pattern gain of 1.7 (2.31 dB). Elevation gain shall be no less than 22.5 (13.56dB). It shall be designed with the o degree relative field to be located +60 degrees offset from 0 degrees north. The pattern shall meet the requirement of KLPB FCC Construction Permit. The Construction Permit file number is BLANK‐0000225641. 2.2.7 The antenna shall achieve a horizontal polarization effective radiated power of 250 kilowatts and a vertical polarization effective radiated power of 107 kilowatts using 1,720 feet of 4 1/16” 50 ohm transmission line with 15.6 kilowatts on the input of the transmission line. 2.2.8 Elevation null fill shall be no less than 35% first null, 13% second null, and 9% third null. Elevation patterns shall be supplied with the bid. 2.2.9 The antenna beam tilt shall be 1.0 degree. 2.2.10 The antenna input power rating shall be rated at a minimum of 16 kilowatts average digital television power operating on the “Nextgen” ATSC 3.0 modulation standard. 2.2.11 The antenna shall be tested and fully certified at the factory prior to shipping. The antenna shall be shipped fully assembled. On‐site antenna assembly shall not be allowed. 2.2.12 A formal antenna input elbow complex shall be supplied to allow easy changing of antenna from the existing 4 1/16” 50 ohm transmission line. L.E.T.A shall provide any existing tower drawings to assist with the design of the input complex. However, final “fit” will be the responsibility of the Contractor. Any cut sections to connect to the existing 4 1/16” 50 ohm transmission line to the elbow complex input shall be factory welded and shipped overnight.
