There is only 'one' Opera ! there is
no other single carrier on/off data system
Yes , Markus has designed a secondary
detector that acts as a pattern recognition system , for best
results , the qrg needs to be as stable as possible , wspr
uses 4 carriers , so not suitable and conventional qrss has a
limited number of transitions
Opera sends 256 bits in each tx cycle
, which can be detected earlier than the main decoder , that is
extracting the call from the received data as opposed to
pattern matching , 'a software bombe'
Using the long Op coded tx signal , now
, gives a 3 way split , the 65 min tx time produces quite a
sizeable block of data to post-process
1... Normal decode with Op
software ------round -43 dB
2...qrss grabber trace as line on
qrg...... ??
3... correlation detection ....... -50 dB
??
With the advantage of 50% duty cycle ..
73-G,
