New open will be opened “Crystal Parameter Choices”. From main menu select DE SIGN -> Crystal Ladder -> Classic -> filter type (Butterworth, Chebyshev or Cohn). I ordered the crystals in polish company – Omig:Īfter completing all the work I realised that filters was feasible to made with only 8214kHz crystalsĬrystal parameters measured with 3dB method: Two CW filters: wide (~500Hz) and narrow (~250Hz) – Butterworth or Cohn (low passband attenuation)įilter impedance – 500 Ohm.Two additional SSB filters (~2,0kHz i ~1,6kHz) – Chebyshev.Up to 4 additional filters can be installed inside main receiver.ġ) Requirements and selection of crystals Radio cames with standard SSB filter 2,7kHz (crystal latter – 5 resonators). Filter center frequency don’t need to be exact 8215.0kHz – it can be compensated in radio configuration. This allows to develop and use homemade filters. attenuation can be compensated from 0 do 8dB. for each filter you can specify bandwidth (50Hz do 13kHz in 50Hz steps) and frequency offset from -1,28kHz to +0,25kHz. Elecraft K3 allow to configure details of installed crystal filters.
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