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Tunable Filters

• 24 MHz to 3000 MHz

• Direct Readout

• Octave Tuning

• High Power

• Digital and Manual Tuning Available

• Diplexer Configuration

• Ruggedized Applications

Lorch Microwave's tunable filter products are designed to

provide high performance in a single package. While

typically used in test and measurement applications, these

products can also be ruggedized for mobile and remote

applications.

Tunable Filter Part Number Description

5 TF - 200/400 - 5 S

1 2

4 5

1. Number of Sections

2. Series (TF)

3. Frequency Range, MHz

4. Percent Bandwidth 3 dB

BW and Designator

5. Connectors

Connectors

Connector Type Designator

BNC Female

N Female

SMA - Female

TNC - Female

Lorch Microwave offers several standard Bandpass and

Bandreject Tuners covering the frequency range of 24 MHz

to 3000 MHz in octave bands. Cellular and PCS units cover

less than full octaves, however they feature greater dial

resolution. All standard units offer direct frequency read-

out, high power, and narrow bandwidth.

Lorch Microwave's standard products may be customized to

meet specific requirements; including Digitally Controlled,

Diplexed, and Ruggedized options. Contact the factory for

your specific requirements.

An additional feature of Lorch Microwave's Tunable Filter

Product Line is the ability to ship standard bandpass and

bandreject filters overnight from stock.

5 Section Tunable Bandpass

6.50

Bandwidth

3 dB

special

Designator

/(blank)

3 Section Tunable Bandpass

3.25

0.98

TUNABLE

BANDPASS

FILTER

0.98

TUNABLE

BANDPASS

FILTER

1725 N. Salisbury Blvd. • PO Box 2828 • Salisbury, MD 21802

P: 800-780-2169, 410-860-5100 • F: 410-860-1949 • www.lorch.com • lorchsales@lorch.com

Tunable Filters — Bandpass

Standard Cellular and PCS Tunable Bandpass Filters

Part

Number

Freq.

No. of

Range

Sec.

(MHz)

800-1000

1800-2200

Insert.

Avg.

Loss Nominal VSWR

Power

dB Bandwidth (Typ.)

(watts)

(Typ.)

1.25

1.5

Cellular Bandpass

1.5:1 50 watts

PCS Bandpass

1.5:1 50 watts

Dial

Acc.

dB/

3 dB 5 dB

Ratio Ratio

3.5:1

2.2:1

3.5:1

2.2:1

Length

Inches

(mm)

Width

Inches

(mm)

Height

Inches

(mm)

3BT-800/1000-1S

5BT-800/1000-1S

3BT-1800/2200-1S

5BT-1800/2200-1S

+/- 0.5%

N/A 6.6 (167.6) 5.4 (137.2) 2.8 (71.1)

3.5:1 9.8 (248.9) 5.4 (137.2) 2.8 (71.1)

N/A

3.5:1

6.57”

9.86”

2.0”

Standard Tunable Bandpass Specifications

Number of

Sections

Frequency

Range (MHz)

30-3000

Nominal

Bandwidth

VSWR

1.5:1

Average

Power (watts)

Dial

Accuracy

+/- 1%

30 dB/3dB

Ration

3.5:1

2.2:1

50 dB/3dB

Ration

N/A

3.5:1

3 Section Tunable Bandpass

Stock 3

Section Units

3TF-24/48-5S

3TF-30/76-5S

3TF-32/64-5S

3TF-48/95-5S

3TF-63/125-5S

3TF-95/190-5S

3TF-125/250-5S

3TF-200/400-5S

3TF-225/400-5S

3TF-250/500-5S

3TF-375/750-5S

3TF-500/1000-5S

3TF-750/1500-5S

3TF-1000/2000-5S

3TF-1500/3000-5S

Insertion Loss

dB (Typical)

1.0

0.8

0.7

Length

Inches (mm)

6.6 (167.6)

5.0 (127.0)

Width

Inches (mm)

5.4 (137.2)

2.9 (73.7)

Height

Inches (mm)

2.8 (71.1)

5 Section Tunable Bandpass

Stock 3

Section Units

5TF-24/48-5S

5TF-30/76-5S

5TF-32/64-5S

5TF-48/95-5S

5TF-63/125-5S

5TF-95/190-5S

5TF-125/250-5S

5TF-200/400-5S

5TF-225/400-5S

5TF-250/500-5S

5TF-375/750-5S

5TF-500/1000-5S

5TF-750/1500-5S

5TF-1000/2000-5S

5TF-1500/3000-5S

All width dimensions are excluding connectors.

Insertion Loss

dB (Typical)

1.3

1.0

Length

Inches (mm)

9.8 (248.9)

7.4 (188.0)

Width

Inches (mm)

5.4 (137.2)

2.9 (73.7)

Height

Inches (mm)

2.8 (71.1)

1725 N. Salisbury Blvd. • PO Box 2828 • Salisbury, MD 21802

P: 800-780-2169, 410-860-5100 • F: 410-860-1949 • www.lorch.com • lorchsales@lorch.com

Tunable Filters — Bandreject

• 24 MHz to 2000 MHz

• Direct Readout

• Octave Tuning

• Digital and Manual Tuning Available

• Extended Passband

• High Power Application

• Custom Bandwidths

Tunable Filter Part Number Description

3 NF - 200/400 - 5 S

1 2

4 5

1. Number of Sections

2. Series (NF)

3. Frequency Range, MHz

4. Percent Bandwidth (as a

percentage of 3 dB BW)

5. Connectors

• Ruggedized Applications

Digital Filter Options

Lorch Microwave can provide a wide selection of tunable

bandpass and bandreject options, including digitally con-

trolled 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.

Note: Outline drawings for Bandreject Filters are the same as Tunable Filters. See

page .

Connectors

Connector Type Designator

BNC Female

N Female

SMA - Female

TNC - Female

Bandwidth

3 dB

special

Designator

/(blank)

Standard Cellular and PCS Tunable Bandreject Filters

Part

Number

No. of

Sec.

Freq.

Range

(MHz)

800-1000

1800-2200

Insert.

Avg.

Nominal VSWR

Loss

Power

Bandwidth (Typ.)

(watts)

(Typ.)

Cellular Bandreject

1.5:1

50 watts

1.5:1

50 watts

PCS Bandreject

1.5:1

50 watts

1.5:1

50 watts

Dial

Acc.

Notch

Depth

Length

Inches

(mm)

Width

Inches

(mm)

Height

Inches

(mm)

3NF-800/1000-1S

5NF-800/1000-1S

3NF-1800/2200-1S

5NF-1800/2200-1S

+/- 0.5%

50 dB

75 dB

50 dB

75 dB

6.6 (167.6) 5.4 (137.2) 2.8 (71.1)

6.57”

9.86”

2.0”

Standard 3 section Tunable Bandreject Filters

Stock 3

Insertion Loss

Section Units dB (Typical)

3NF-25/50-S

3NF-30/76-S

3NF-50/100-S

3NF-100/200-S

3NF-200/400-S

3NF-250/500-S

3NF-375/750-S

3NF-500/1000-S

3NF-1000/2000-S

1.0

3 dB

BW (MHz)

1-2.5

3-6

3-7

6-16

9-24

40 dB BW

min. (KHz)

100

300

400

Notch

Depth (dB)

Length

Inches (mm)

6.6 (167.6)

5.2 (132.1)

Width

Inches (mm)

5.4 (137.2)

2.9 (73.7)

Height

Inches (mm)

2.8 (71.1)

All width dimensions are excluding connectors.

1725 N. Salisbury Blvd. • PO Box 2828 • Salisbury, MD 21802

P: 800-780-2169, 410-860-5100 • F: 410-860-1949 • www.lorch.com • lorchsales@lorch.com

Tunable Filters — Digital

• 24 MHz to 3000 MHz

• Octave Tuning

• High Position Resolution

• Built in Backlash Compensation

• Simple Command Structure

Lorch’s Standard Digitally Controlled Bandpass Filters are

available with 3 or 5 sections in the frequency range of 25

MHz to 3000 MHz. The typical insertion loss at center

frequency ranges from 0.7 dB to 1.0 dB and standard tuners

have a 3 dB passband bandwidth of 5%. Digitally

Controlled Bandreject Filters are also available. Standard

Bandreject Filters have 3 or 5 sections with a center

frequency between 25 MHz to 220 MHz and a notch depth

of 50 dB to 75 dB. The rejection bandwidth is typically 1%.

All Standard Digitally Controlled Filters have a dial

accuracy of better than 0.5%. The filter is controlled by

sending commands as ASCII strings to the RS232 port.

Communications:

The controller communicates via a RS232-C port with the following settings:

9600 BAUD, 8 Bits/Byte, No parity, 1 stop bit. If a PC us used to send commands to the controller, a standard serial

cable must be connected to the RS232 port of the filter.

Power Supply:

The digitally controlled filter is supplied with a 24 VDC, 0.625 mA, universal power supply. Typically a filter draws

about 250 mA of current.

Lifetime Expectancy & Servicing:

Lorch’s Digitally Controlled Filters do not require servicing. The meantime to failure is calculated at approximately

1,000,000 tune commands (based on 1 tune command every 30 seconds over 1 year) and is mainly determined by the

limited number of write cycles to EEPROM to keep track of the current frequency setting.

1725 N. Salisbury Blvd. • PO Box 2828 • Salisbury, MD 21802

P: 800-780-2169, 410-860-5100 • F: 410-860-1949 • www.lorch.com • lorchsales@lorch.com