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Tunable Notch Filter Network

EM-7843 | 100 MHz – 375 MHz

The EM-7843 Tunable Notch Filter Network is a tunable narrowband rejection filter operating from 100 MHz to 375 MHz. 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-7843 permits its use for measurements on high power transmitters, providing the voltage input level is carefully regulated.

The EM-7843 covers from 100 MHz to 375 MHz in two (2) frequency bands. Each band uses a series of tuning networks that is essentially a bridge-T network.

The EM-7843 is designed for bench top operation.



Frequency Range: 100 MHz – 375 MHz
Maximum Voltage:
71 Vrms at the tuned frequency
20 Vrms at all other frequencies
Number of Tuning Bands: 2
Band 1: 100 – 250 MHz
Band 2: 250 – 375 MHz
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.)