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Tunable Notch Filter Network

EM-7844 | 375 MHz to 1 GHz

The EM-7844 Tunable Notch Filter Network is a tunable narrowband rejection filter operating from 375 MHz to 1 GHz. It is used whenever high rejection (attenuation) is required at one select frequency and low attenuation for the other frequencies. The high power rating of the EM-7844 permits its use for measurements on high power transmitters, providing the voltage input level is carefully regulated.

The EM-7844 covers from 375 MHz to 1 GHz in two (2) frequency bands. Band 1 covers from 375 MHz to 700 MHz, while Band 2 covers 700 MHz to 1 GHz. Each band uses a series of tuning networks comprising a variable capacitor plus assorted fixed resistors and inductors.

The EM-7844 is designed for bench top operation.



Frequency Range: 375 MHz to 1 GHz
Maximum Voltage:
71 Vrms at the tuned frequency
20 Vrms at all other frequencies
Number of Tuning Bands: 2
Band 1: 375 – 700 MHz
Band 2: 700 MHz – 1 GHz
Minimum Rejection: 50 dB
Connectors: Type N, female


Height: 14.7 cm (5.8”)
Length: 26.2 cm (10.3”)
Width: 25.7 cm (10.1”)
Weight: 4.5 kg (10 lbs.)