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Lorch Microwave is now Smiths Interconnect

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Tunable Bandreject Filters

25 MHz to 2000 MHz
Direct Readout
Octave Tuning
Digital and Manual Tuning Available
Extended Passband
High Power Application
Custom Bandwidths
Ruggedized Applications

Calculating Number of Sections

Cavity Filter Part Number Description

1. Number of Sections

2. Series (NF)

3. Frequency Range, MHZ

4. Connectors

Bandwidth Designator
3 dB /(blank)
special /X
Connectors
Connector Type Designator
BNC Female (1) B
F F
N Female N
SMA Female S
TNC Female (1) T
Overview
Bandpass
Bandreject
Digital Tunable Filters


Digital Filter Options

Lorch Microwave can provide a wide selection of tunable bandpass and bandreject options, including digitally controlled filters. Standard bandpass and bandreject tuners can be configured to provide digital frequency control. Tuning is accomplished by utilizing a servo-type stepping motor to drive the gear assembly.

A programmable microprocessor-based system is used. Many control logic options exist including serial, RS-232, RS-422, IEEE-488, and BCD.


Standard Cellular and PCS Tunable Bandreject Filters

 Part No.

 No. of Sections Freq. Range (MHz) Insert. Loss dB (Typ.) Nominal
Bandwidth
VSWR Avg.
Power
(Watts)
Dial
Acc.
Notch
Inch (mm)
Length
Inches
(mm)
Width
Inches
(mm)
 
Width
Inches
(mm)
Cellular Bandpass
3NF-800/1000-S 3 800-1000 1 1% 1.5:1 TYP 50 W ±0.5% 50 DB 6.6 (167.6) 5.4 (137.2) 2.8
(71.1)
5NF-800/1000-S 5 800-1000 1 1% 1.5:1 TYP 50 W ±0.5% 75 DB 6.6 (167.6) 5.4 (137.2) 2.8
(71.1)
PCS Bandpass
3NF-1800/2200-S 3 1800-2200 1 1% 1.5:1 TYP 50 W ±0.5% 50 DB 6.57" (166.9) 2.0"
(50.8)
2.0"
(50.8)
5NF-1800/2200-S 5 1800-2200 1 1% 1.5:1 TYP 50 W ±0.5% 75 DB 9.86"
(250.4)
2.0"
(50.8)
2.0"
(50.8)


Standard 3-Section Tunable Bandreject Filters
Stock 3
Section Units
Insertion
Loss dB (Typical)
3 dB
BW (MHz)
40 dB BW
min. (KHz)
Notch
Depth (dB)
Length
Inches (mm)
Width
Inches (mm)
Height
Inches (mm)
3NF-25/50-S 1.0 1-2.5 100 50 6.6 (167.6) 5.4 (137.2) 2.8 (71.1)
3NF-30/76-S 1.0 1-2.5 100 50 6.6 (167.6) 5.4 (137.2) 2.8 (71.1)
3NF-50/100-S 1.0 3-6 300 50 6.6 (167.6) 5.4 (137.2) 2.8 (71.1)
3NF-100/200-S 1.0 3-6 300 50 6.6 (167.6) 5.4 (137.2) 2.8 (71.1)
3NF-200/400-S 1.0 3-7 300 50 6.6 (167.6) 5.4 (137.2) 2.8 (71.1)
3NF-250/500-S 1.0 3-7 300 50 6.6 (167.6) 5.4 (137.2) 2.8 (71.1)
3NF-375/750-S 1.0 6-16 400 50 6.6 (167.6) 5.4 (137.2) 2.8 (71.1)
3NF-500/1000-S 1.0 6-16 400 50 6.6 (167.6) 5.4 (137.2) 2.8 (71.1)
3NF-1000/2000-S 1.0 9-24 400 50 5.2 (132.1) 2.9 (73.7) 2.8 (71.1)


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