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Description Videos Reviews Peter VK3YE tests a LASERBEAM-DUAL module _______________________________________ Digital CW and SSB Bandpass Filter Modules Our range of ready-made LASERBEAM-DUAL digital audio filter modules are the perfect addition to your project or even to 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-DUAL Modules have been designed for ease of use. Each module has two bandpass filters onboard. There are three combinations to choose from: The General Purpose module has a narrow CW filter (550 - 850 Hz) and an SSB filter (300 - 2700 Hz) The CW module has two narrow filters (550 - 850 Hz) and (300 - 1300 Hz) The SSB module has a standard SSB filter (300 - 2700 Hz) and a narrow SSB filter (300 - 2400 Hz). The General Purpose module is great for users who like to move between SSB and CW. It would made a great addition to radios such as the KX1, BITX40 or HB1B which offer CW and SSB reception. A digital bandpass filter will make a real improvement to the skirt selectivity of the analogue filters in these simple radios. The CW module is sure to prove popular with CW specialists. The 1,000 Hz bandwidth filter is great for tuning around while the 300 Hz filter allows the user to "home in" on a signal of interest. The SSB module offers two useful bandpass filters. The wider filter is great for improving the performance of your radio's existing filters while the narrower filter will be of great use for DXing or contesting under difficult conditions. Note that these are bandpass filters only, so will not do anything about noise inside the passband. However, they should be very effective at eliminating noise and signals outside the passband. They will make the biggest difference to older or simpler radios that do not already have advanced DSP filtering on the audio output. Actual filter

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