Four State QRP Group

Four State

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Designed by
David Cripe NMØS

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and Information Group
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Kitted and Offered For Sale By The Four State QRP Group

The SSB-MITE is a high-performing SSB filter capable of being added to nearly any receiver. The SSB-MITE uses simple analog signal-processing circuitry to provide highly effective audio filtering from a simple circuit. It is designed to be very versatile, have low parts count, be inexpensive, yet provide outstanding performance. This is a flexible design that can be used as a stand-alone unit driving headphones, earbuds, or speakers, or it can be easily integrated into an existing receiver needing additional filtering (see manual for details).

Designed by David Cripe NMØS, the SSB-MITE provides very sharp passband filtering ideal for use with a SSB receiver. The implementation of this filter is with four op amps to create two low-pass filters, a notch filter, and one high pass filter. This frequency response creates a rapid roll off of frequencies above 3 kHz to reduce objectionable adjacent-channel noise.
The SSB-MITE has a number of assembly options depending on how it is to be used. It can be used as an outboard filter and amplifier, plugging into the headphone jack of an existing receiver, and driving a speaker or headphones. The SSB-MITE can be used as a high gain audio filter and speaker driver in conjunction with a homebrew receiver. Alternately, it may be used as an add-on audio filter internally, in conjunction with an existing receiver that might need a SSB filter. Each option has a different assembly sequence.

This low cost kit sacrifices nothing in the way of quality. It features a high quality printed circuit board, low parts count, all through hole parts, and fast and easy building. It is an excellent kit for first time builders.

First time builders please note: This kit is not difficult to build, there are NO SMT parts and the parts are wide spaced on the board making installation easy.

    Specifications and Design Features
    Passband Frequency:  300 to 3000 Hz.
    Signal Gain:  0 dB to 50 dB, user selectable
    Versatile:  Drives speaker, earbuds, or headphones. Use standalone or install inside rig.
    Audio Power:  500 mW into 8 ohms, from 9v supply
    DC Power:  5 to 13 VDC at less than 15 mA
    NO SMT Parts:  All through hole parts..
    NO Toroids:  There are no toroids to wind, special circuits simulate them.
    PCB:  High Quality, silk screened, two sided 38.1 x 50.8mm printed circuit board.

    Assembly Manual
    Parts List
    Frequency Response Chart
    Part Layout
    Photo Page
    Elecraft's Excellent Capacitor Identification Page  Posted with permission.
    Electronics 2000's Excellent Resistor Code Graphic Calculator  Posted with permission.

Ordering Information:
The cost of this kit is $25.50 for US orders, 35.50 for DX orders, which includes shipping. Select one from the drop down menu items below.
If paying by check or money order
(US dollars only) please make it out to "Four State QRP Group" and send to:
Four State QRP Group
Tom Brown WØMFQ
PO Box 627
St. Charles, MO 63302

The SSB-Mite is carefully kitted and shipped by Dennis Gaskill, KCØIFQ. and Dick Hammond, NØTGR.
Please direct kit and part related questions to Dennis
All proceeds are applied toward funding OzarkCon.   Thank you for supporting The Four State QRP Group.
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the Four State QRP Group and may not be published or used without permission.