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Lorch Microwave is now Smiths Interconnect

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Digital Tunable Filters

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.

24 MHz to 3000 MHz
Octave Tuning
High Position Resolution
Built in Backlash Compensation
Simple Command Structure
Bandwidth Designator
3 dB /(blank)
special /X
Connector Type Designator
BNC Female (1) B
N Female N
SMA Female S
TNC Female (1) T
Digital Tunable Filters


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 about >1,000,000 tune commands (bases 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.

For a complete manual please contact factory.

Outline Drawing:

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