AM Broadcast Engineering Services
CTJC provides a broad array of engineering services for AM broadcasters including: FCC application preparation for new and modified facilities; directional antenna design, phasing and coupling system design and fabrication; facilities improvement studies; soil conductivity measurements and analyses; directional antenna system verification through Method of Moments computer modeling (MoM Proof of Performance); enhanced impedance and pattern bandwidth designs to meet IBOC requirements and to improve analog audio performance; and engineering to support complex multi-station interference agreements. CTJC is one of only a handful of engineering firms that specialize in AM broadcasting. Our entire engineering staff has experience in this field. Our staff is equipped with the knowledge and tools to tackle the most challenging projects and to provide expertise from initial concept to final licensing of a facility.
If you are looking to improve coverage of your market, we may be able to help you increase power or otherwise optimize your coverage. Our directional antenna design experts use proprietary in-house software in combination with the latest commercially available software to achieve enhanced directional antenna designs that were not possible just a few years ago. Where the complexity of the situation is beyond a simple modification to a single station, our engineers can assist you with developing strategies for modifying two or more stations and developing the necessary interference agreements to achieve FCC approval of a multi-station modification proposal.
Our engineers are expert in the design of phasing and coupling systems for optimal impedance and pattern bandwidth performance. If your antenna systems' audio performance is not up to par or if you are considering adding IBOC operation at your station, we can redesign and field modify your phasing and coupling system for peak performance. Our engineers use a number of commercial computer codes along with specially developed in-house computer software to achieve the best possible station performance. Commercially available computer codes that are used extensively in our design process include: the Numerical Electromagnetic Code, Version 4 ("NEC 4"), MiniNEC Broadcast Professional, PSPICE and Phasor Professional.
To achieve efficiencies in a particular market, we often recommend that two or more stations combine their operations on a single tower or an array of towers. Our engineers have designed and implemented numerous high powered diplexed (two stations) directional antenna systems, as well as, multiplexing up to four non-directional stations on a single tower. In these complex designs, the exact filtering design and selection of components is critical to each station's performance. Our engineers have the capability and experience to make the tradeoffs that will achieve an optimal design for each station.
Another method of improving an AM station's audience is to supplement the AM signal with a simulcast FM translator signal. Our engineers can help you to identify available translators in or near your market and optimize the translator's coverage of the market. For AM stations operating during daytime hours only or for stations having low power or otherwise inferior nighttime signals, the addition of a simulcast FM signal may allow your station to finally be competitive 24 hours a day.
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