Overview

SOTAbeams LASERBEAM-VARI Digital Variable Bandwidth Audio Filter Module

SOTAbeams LASERBEAM-VARI Digital Variable Bandwidth Audio Filter Module - the perfect addition to your project or your existing radio. Unlike analogue filters, digital filters provide near-perfect characteristics. Because of the way that they are implemented, they are better than analogue filters in almost every way!

LASERBEAM-VARI Modules been designed for ease of use. One simple control allows you to continuously vary the bandwidth or the center frequency of the filter. All settings produce the same great filters with flat pass bands and steep skirts. Whether you need passband tuning, filters for digital modes and APRS, low pass filters or CW filters, the LASERBEAM-VARI does it all in one compact module. Dial up EXACTLY the filter you need.
•Bandwidth 200Hz - 3500Hz
•Max Passband 200Hz - 3500Hz
•Indicator outputs for tuning mode (bandwidth or center-frequency)
•On board overload indicator
•User-defined power-up filter settings
•Two gain settings

Great for all modes: SSB-CW-Digi-AM-NBFM. A single clickable rotary encoder provides the main functionality. Click to switch between variable bandwidth or center frequency. Store your favorite setting as a power-up default. Simple but very effective, this filter is continuously variable and always has near perfect characteristics unattainable with conventional analogue techniques.

Kit includes:
•filter module PCB (ready-built),
•Bourns rotary encoder (6mm diameter shaft) ,
•3 x LEDs,
•2 x 10 way headers,
•7 resistors, 2 capacitors

NOTICE: NO enclosure or instructions are provided. All construction data is online at SOTAbeams.co.uk

Simple to use: the instructions are downloadable here. The instructions contain information to allow users to control the filter using a microcontroller.

Example filters

These plots have been made by testing a LASERBEAM-VARI using a professional audio spectrum analyzer (QuantAsylum QA400). Remember that the LASERBEAM-VARI can synthesize any bandpass filter that you want (200-3500Hz). Click on the links below to see the filters.
•Typical SSB filter
•Typical 200Hz CW Filter
•Typical 200Hz CW filter but at 3kHz
•Wide filter

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