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
3
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
F
N Female
SMA - Female
TNC - Female
B
F
N
S
T
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
L
6.50
W
Bandwidth
3 dB
special
Designator
/(blank)
/X
3 Section Tunable Bandpass
L
3.25
W
H
0.98
TUNABLE
BANDPASS
FILTER
H
0.98
TUNABLE
BANDPASS
FILTER
34
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)
3
5
3
5
800-1000
800-1000
1800-2200
1800-2200
Insert.
Avg.
Loss Nominal VSWR
Power
dB Bandwidth (Typ.)
(watts)
(Typ.)
1.25
2
1
1.5
1%
1%
1%
1%
Cellular Bandpass
1.5:1 50 watts
1.5:1 50 watts
PCS Bandpass
1.5:1 50 watts
1.5:1 50 watts
Dial
Acc.
30
50
dB/
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%
+/- 0.5%
+/- 0.5%
+/- 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”
2.0”
2.0”
2.0”
Standard Tunable Bandpass Specifications
Number of
Sections
3
5
Frequency
Range (MHz)
30-3000
30-3000
Nominal
Bandwidth
5%
5%
VSWR
1.5:1
1.5:1
Average
Power (watts)
50
50
Dial
Accuracy
+/- 1%
+/- 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
1.0
0.8
0.8
0.8
0.8
0.8
0.8
0.8
0.7
0.7
0.7
0.7
0.7
0.7
Length
Inches (mm)
6.6 (167.6)
6.6 (167.6)
6.6 (167.6)
6.6 (167.6)
6.6 (167.6)
6.6 (167.6)
6.6 (167.6)
6.6 (167.6)
6.6 (167.6)
6.6 (167.6)
6.6 (167.6)
6.6 (167.6)
6.6 (167.6)
5.0 (127.0)
5.0 (127.0)
Width
Inches (mm)
5.4 (137.2)
5.4 (137.2)
5.4 (137.2)
5.4 (137.2)
5.4 (137.2)
5.4 (137.2)
5.4 (137.2)
5.4 (137.2)
5.4 (137.2)
5.4 (137.2)
5.4 (137.2)
5.4 (137.2)
5.4 (137.2)
2.9 (73.7)
2.9 (73.7)
Height
Inches (mm)
2.8 (71.1)
2.8 (71.1)
2.8 (71.1)
2.8 (71.1)
2.8 (71.1)
2.8 (71.1)
2.8 (71.1)
2.8 (71.1)
2.8 (71.1)
2.8 (71.1)
2.8 (71.1)
2.8 (71.1)
2.8 (71.1)
2.8 (71.1)
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
1.3
1.3
1.3
1.3
1.3
1.3
1.3
1.0
1.0
1.0
1.0
1.0
1.0
1.0
Length
Inches (mm)
9.8 (248.9)
9.8 (248.9)
9.8 (248.9)
9.8 (248.9)
9.8 (248.9)
9.8 (248.9)
9.8 (248.9)
9.8 (248.9)
9.8 (248.9)
9.8 (248.9)
9.8 (248.9)
9.8 (248.9)
9.8 (248.9)
7.4 (188.0)
7.4 (188.0)
Width
Inches (mm)
5.4 (137.2)
5.4 (137.2)
5.4 (137.2)
5.4 (137.2)
5.4 (137.2)
5.4 (137.2)
5.4 (137.2)
5.4 (137.2)
5.4 (137.2)
5.4 (137.2)
5.4 (137.2)
5.4 (137.2)
5.4 (137.2)
2.9 (73.7)
2.9 (73.7)
Height
Inches (mm)
2.8 (71.1)
2.8 (71.1)
2.8 (71.1)
2.8 (71.1)
2.8 (71.1)
2.8 (71.1)
2.8 (71.1)
2.8 (71.1)
2.8 (71.1)
2.8 (71.1)
2.8 (71.1)
2.8 (71.1)
2.8 (71.1)
2.8 (71.1)
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
35
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
3
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
F
N Female
SMA - Female
TNC - Female
B
F
N
S
T
Bandwidth
3 dB
special
Designator
/(blank)
/X
Standard Cellular and PCS Tunable Bandreject Filters
Part
Number
No. of
Sec.
Freq.
Range
(MHz)
800-1000
800-1000
1800-2200
1800-2200
Insert.
Avg.
Nominal VSWR
Loss
Power
Bandwidth (Typ.)
dB
(watts)
(Typ.)
1
1
1
1
1%
1%
1%
1%
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
3
5
3
5
+/- 0.5%
+/- 0.5%
+/- 0.5%
+/- 0.5%
50 dB
75 dB
50 dB
75 dB
6.6 (167.6) 5.4 (137.2) 2.8 (71.1)
6.6 (167.6) 5.4 (137.2) 2.8 (71.1)
6.57”
9.86”
2.0”
2.0”
2.0”
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
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
3 dB
BW (MHz)
1-2.5
1-2.5
3-6
3-6
3-7
3-7
6-16
6-16
9-24
40 dB BW
min. (KHz)
100
100
300
300
300
300
400
400
400
Notch
Depth (dB)
50
50
50
50
50
50
50
50
50
Length
Inches (mm)
6.6 (167.6)
6.6 (167.6)
6.6 (167.6)
6.6 (167.6)
6.6 (167.6)
6.6 (167.6)
6.6 (167.6)
6.6 (167.6)
5.2 (132.1)
Width
Inches (mm)
5.4 (137.2)
5.4 (137.2)
5.4 (137.2)
5.4 (137.2)
5.4 (137.2)
5.4 (137.2)
5.4 (137.2)
5.4 (137.2)
2.9 (73.7)
Height
Inches (mm)
2.8 (71.1)
2.8 (71.1)
2.8 (71.1)
2.8 (71.1)
2.8 (71.1)
2.8 (71.1)
2.8 (71.1)
2.8 (71.1)
2.8 (71.1)
All width dimensions are excluding connectors.
36
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
37
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