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AM NRSC Measurement with notch filter — 535 t0 1705 KHZ
The Chicago Radio Engineers use an AM Notch filter from Chris Scott and Associates to aid in the emission measurement of AM broadcast stations.
Accurate measurement of harmonic or spurious levels can then be made in the presence of strong fundamental or interfering signals. Optimal Q makes this possible with negligible insertion loss at harmonic frequencies. Other applications by the Chicago Radio Engineers include various reception enhancement arrangements where single frequency rejection is desired. One popular use of the filter at AM radio stations is to allow AM band EAS reception in the presence of another very strong rf field created by the co-located tower. Nominal response at one megahertz is shown below.
AM Notch Filter Specifications
• Frequency range: .535 - 1.705 MHz
• Impedance: 50 ohms
• Connectors: BNC
• Maximum VSWR @ 2F notch: 1.3:1
• Maximum attenuation @ 2F notch: .4 db
• Maximum operating level: +30 dBm
• Minimum Notch depth: see graph
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Call Dr. Jim White at 847-328-0775 or 847-337-0775 for 24/7 OFF AIR Emergency phone and field service. We have spare parts in stock.
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WHO WE ARE
Dr. Jim White is the President and Chief Engineer for the Chicago Radio Engineers. He is a broadcast veteran with over 35 years of experience in the industry. Dr. White's partners are certified engineers—experienced and committed to Excellence in Broadcasting.
Together, the Chicago Radio Engineers have a broad knowledge base as well as specialized training in the complex systems that power today's modern broadcast facilities. Projects undertaken by the Chicago Radio Engineers are completed efficiently and effectively by assigning personnel with the required expertise where and when needed.
The Chicago Radio Engineers are also well versed in balancing the technical and personal needs of management, sales, programming, production, and other members of your station.