|
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,
Sent: Sunday, September 29, 2013 9:23 PM
Subject: RE: LF: 74550 XRS in Germany
Markus; Hartmut has settled on 74.549 for my freq. I
didn't realize it is that "sticky" ! Do you have special program to help
programs like OPERA? Does it help QRSS and WSPR?
From: [email protected]To: [email protected]Date:
Sun, 29 Sep 2013 22:00:19 +0200 Subject: LF: 74550 XRS in Germany
Hi Hartmut,
yes: 100000 - 3426 *
50000 / 6731 = 74550.5868 Hz. Since Sylt is dual-rated, the "Lessay"
lines are also radiated by this station.
From the back of your antenna, you might also find
6.25 Hz multiples from Slonim (GRI 8000), eg. 74550.000 Hz.
Best 73,
Markus (DF6NM)
Sent: Sunday, September 29, 2013 7:52 PM
Subject: Re: LF: 74550 XRS in Germany
Am 2013-09-29 19:28, schrieb Markus Vester: >
That Loran line is probably one from Sylt (GRI 7499): > 100000
- 3817 * (50000/7499) = 74549.940 Hz Markus, thanks for the Loran
frequency. I was searching last night a signal for calibrating the rx. I
used DCF77 because I didn't remember the Loran formular. Lessay seems to be
0,6Hz above. 73 Hartmut |
