AM band Notch filter - Tunable 535 to 1705 kHz
The AM problem solver (out of production)
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 with a spectrum analyzer. 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 non-linearities 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 some spectrum analyzers. The low-loss mode (output 1) has negligible attenuation at + - 75 kHz and beyond.
The Deep Notch (output 2) provides the maximum attenuation. Both the deep notch and the low-loss functions are in the same unit for flexibility. 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 at 1000 kHz.
Deep Notch (500 kHz span)
Low-loss (200 kHz span)
- 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
- Insertion loss at AM harmonic frequencies: < 1 dB
- Construction: cast aluminum.
- Documentation: User guide
Partial listing of clients and customers
Knob style may vary.
Specifications and pricing subject to
change
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