3d Morse Code CW Audio listening - 8 ops, 8 speakers - using AM Modulation & the Rohde's AM Detector
experimental setup using 8 speakers, with each speaker PLAYING the CW AUDIO from only the CWop assigned to that speaker
uses sound card SDR(sample rate 192Khz) and AM modulation of each OP's CW at the following 8 CW CARRIER FREQUENCIES
20Khz, 30Khz, 40Khz, 50Khz, 60Khz, 70Khz, 80Khz & 90Khz
using the SOUND CARD SDR MODULES from RECRI KEYER
https://github.com/recri/keyer
The input to each Rhode's AM Detector (from just 1 channel mono audio stream from sound card, containing all 8 AM AFCW MODULATED carriers)
http://www.pan-tex.net/usr/r/receiver...
is using a series tuned FERRITE CORE inductor COIL AND a parallel tuned FERRITE CORE inductor COIL for each of the 8 carrier frequencies...
output of each Rohde's AM Detector goes to 8 individual audio amps ...
output of amps to their respective speaker...
this double resonant tuning, allows a high enough Q factor for each carrier frequency bandpass to basically isolate all other CW frequencies from getting through except the one it is tuned to...