20-70-02, 450-470 MHz, Series-Notch Cavity Filter passes a relatively wide band of frequencies while rejecting a very narrow band of frequencies. It is equivalent to a series-tuned circuit. Notch depth is variable from 15-25 dB. Pass and notch frequencies must be known so that the optimum loop assembly can be used. This is the best filter for very close separations (200-400 KHz) in UHF applications.
- Various Low-Loss High-Rejection Models to choose from.
- All Loop Plate/connector assemblies are silver-or Alballoy®-plated for low IM.
- Welded cavity construction and silver-plated tunable probe and loops give superior pass and reject characteristics.
All cavity types mentioned above may be cascaded to achieve an arithmetic sum of individual filter attenuation. Up to 6 dB of additional attenuation can be achieved when the proper length of cable is used to interconnect the cavities. (This additional 6 dB does not occur in the filter passband but only at frequencies where moderate to high attenuation occurs.) A TX RX system specialist can assist you in ordering the proper length of interconnecting cable for your frequencies.
|Item Name||450-470 MHz, Series-Notch Cavity Filter|
|Frequency Range||450-470 MHz|
|Insertion Loss vs Frequency Separation||(w/ dual cavity, notch depth @ 34 dB)
3.0 dB @ 175 kHz
1.5 dB @ 250 kHz
0.5 dB @ 500 kHz
0.4 dB @ 1 MHz
(w/ dual cavity, notch depth @ 44 dB)
3.1 dB @ 250 kHz
2.6 dB @ 275 kHz
1.0 dB @ 500 kHz
0.4 dB @ 1 MHz
|Max Power||35 W @ 175 kHz
35 W @ 250 kHz
40 W @ 275 kHz
120 W @ 500 kHz
350 W @ 1 MHz
|Cavity Length - Electrical||1/4λ|
|Temperature Range||-30 to +60 °C|
|Number of Cavities||2|
|Cavity Height||11.5" w/ tuning rod extended, 16.5" max.|