AM band Notch filter - Tunable 535 to 1705 kHz
The AM problem solver Ordering page
The AM Notch filter is designed to aid emission measurement of AM broadcast stations using a spectrum analyzer or other calibrated receiver. Accurate measurement of harmonic or spurious levels can be made in the presence of strong fundamental or interfering signals. Optimal Q makes this possible with negligible insertion loss at harmonic frequencies.
Nominal response at one megahertz is shown below. The low-loss function is designed to not only prevent spectrum analyzer overload when measuring harmonic frequencies, but to also be used for NRSC bandwidth measurements, displaying energy below the 70 or 80 db on-screen limit of most spectrum analyzers. The low-loss mode (output 1) has negligible attenuation at + - 75 kHz and beyond.
The Classic response (output 2) provides the deepest possible notch. Our most popular unit is the combined version which includes dual outputs, providing both the deep notch and the low-loss functions in the same unit - a very flexible testing package. NRSC bandwidth testing use is covered in more detail in the page: Breaking the 80 dB barrier. Hundreds of these are currently in use from Asia to Europe; many users email us with kind words. We also offer other related high-pass and low-pass filters here.
Actual two-port measurement images:
- Frequency range: .535 - 1.705 MHz
- impedance: 50 ohms
- Connectors: BNC
- Maximum VSWR @ 2F notch: 1.3:1
- Maximum attenuation @ 2F notch: see measurements
- Maximum operating level: +30 dBm
- Minimum Notch depth: see measurements
- Construction: cast aluminum.
- Documentation: User guide
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