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'FQ' Series Cavity Filters
FQ-20107*3 Close Separation'FQ' Series Q-Circuit Filters
These filters employ the Sinclair-developed Q-circuit design. The operation of the Q-circuit is such that it inverts the characteristics of a standard notch filter, and uses the narrow resonance notch to create the circuit passband while allowing the lower Q elements, such as the loop and its reactance adjustment, to produce the relatively broad isolation notch. FQ-30107*3 Wide SeparationIn this manner, optimum use of the cavity components is realized, resulting in close pass/reject spacing, low insertion loss, and broad isolation notch. The filters can be tuned for either high or low pass condition, with minimum frequency separations.FQ-20107*3 Mode SeparationThe Q-circuit filter combines the features of a bandpass and reject filter. This can be particularly useful when a close frequency might interfere with the desired frequency. For this reason, both the pass and reject frequencies and required insertion loss must be specified when ordering Q-circuit filters.

*FQ' Q-Circuit FiltersFQ-40137*3 Close Separation

  • Suppress sideband noise of a single co-located transmitter on a closely-spaced receiver.
  • Protect a closely-spaced receiver further from front-end overload by the carrier of co-located transmitter.
  • Suppress IM generation in one transmitter by protecting it further from an incoming carrier of a closely-spaced co-located transmitter.
  • Generally, "Protect One from One" at close frequency spacing.

SPECIFICATIONS
Electrical   (Specifications)
   

FQ-20107*2

FQ-20107*3

FQ-30107*3

FQ-40137*3
Frequency Range

MHz

 132-150 138-174 406-512 806-960
Frequency Separation
Pass Band Insertion Loss See Curves
Attenuation dB See Curves
Maximum Input
VSWR (Note1)		 1.5:1
Maximum Input Power Watts 350
Termination 'N' Female
Temperature Range -40°C to +60°C
Note:1- VSWR is referenced to 50 ohms. VSWR varies with insertion loss setting.
2- Specify transmit and receive frequencies when ordering. If unspecified, filters will be supplied untuned.
Mechanical Specifications
 

FQ-20107*2

FQ-20107*3

FQ-30107*3

FQ-40137*3
Height in (mm)

36 (914)

32.5 (826)

 16.6 (442) 16.7 (424)
Width in (mm) 7.0(178)
Depth in (mm) 7.0(178)
Weight lb (kg) 11 (4.90) 10 (4.54) 6 (2.72) 5.5 (2.5)
Wisco International - 690 W 28 St. Hialeah, FL 33010 USA
Telf. (305) 888-1676 - Fax (305) 887-1624 - E-mail: wiscointl@wiscointl.com

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