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15-37-09, 144-174 MHz, Vari-Notch Cavity Filter
The Vari-Notch® design passes a relatively narrow band of frequencies and rejects (notches out) a relatively wide frequency band. Equivalent to a combination series-tuned and parallel-tuned circuit, this filter has a greater notch depth than the Series-Notch® design. The notch depth is adjustable but varies with passband insertion loss (0.3dB or 0.6dB typical) and the difference between pass and notch frequencies. Vari-Notch® is ideal for moderately close to wide separations (200 KHz and greater) in VHF applications and (400 KHz and greater) in UHF applications.





Product Specifications 
Item No15-37-09
Item Name144-174 MHz, Vari-Notch Cavity Filter
Frequency Range144-174 MHz
Minimum Separation - Pass to Notch320 kHz
Frequency Separation320 kHz
500 kHz
1 MHz
2 MHz
Attenuation vs Pass to Notch18 dB @ 320 kHz
24 dB @ 500 kHz
35 dB @ 1 MHz
44 dB @ 2 MHz
Power Rating150 W
Impedance Ω50
VSWR1.25:1 max.
Cavity Length - Electrical1/4λ Low Pass
Temperature Range-30 to +60 °C
Cavity Diameter4"
Number of Cavities1
Cavity Height15" w/ tuning rod extended, 20" max.
Shipping Weight5 lbs.