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| To: | [email protected] |
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| Subject: | Re : LF: OPERA The new CW / QRSS replacement data mode |
| From: | [email protected] |
| Date: | Mon, 2 Jan 2012 14:46:54 -0500 (EST) |
| In-reply-to: | <24EF41C85642406DBC109E6B63190CBD@AGB> |
| References: | <24EF41C85642406DBC109E6B63190CBD@AGB> |
| Reply-to: | [email protected] |
| Sender: | [email protected] |
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First receptions here on 500 kHz:
19:33 P0AAA 500 Op2 +6 dB
19:27 P0AAA 500 Op2 -2 dB
18:39 P0AAA 500 Op2 +6 dB
18:30 P0AAA 500 Op2 -4 dB
18:17 PA3ABK 500 Op2 -20 dB
18:13 P0AAA 500 Op2 -2 dB
18:05 PA3ABK 500 Op2 -14 dB
F4DTL Nicolas
-----E-mail d'origine-----
De : Graham <[email protected]> A: rsgb_lf_group <[email protected]> Envoyé le : Lundi, 2 Janvier 2012 1:09 Sujet : LF: OPERA The new CW / QRSS replacement data mode All,
After some time in development the 136/500 version of the Opera data mode is ready for experimental use .
Download links are available from myself or Gary, G4WGT as the versions may change , these may also change ,
Users are invited to join the Opera yahoo group http://groups.yahoo.com/group/O_P_E_R_A_/?yguid=131323118
At the moment , spots are distributed to other OP users on line at the time ,. future intent is to link to the PSK-Reporting network and for a HF version and possible limited QSO mode , allowing under the noise qso's with a simple xtal tx
There is a on line chat mode to facilitate tests etc
The software is available for all , free to use ,
Happy new year to all and good luck
73-G ..
OPERA The new CW/ QRSS replacement data mode
There is always the assumption that all armature radio stations can effectively translate what ever new soundcard data mode that is coded to radio frequency..
The question I posed was ‘What about those who cannot , and only have CW transmission facility’s’? …
Never did get a reply
So after a long exchange of emails , the concept of a serial data mode that used only one tone , on/off keyed , with a eye on the qrss system, was finally discussed and coding work begun, an initial statement that in software , could be achieved a lower level of detection than that required to produce a line on a spectrum plot set the scene for a what was originally proposed to be a simple data mode, turned into to a race to the noise floor.
OPERA
Is a totally new Data / Beacon mode , profiled for the 136 and 500 bands , with HF possibility’s later in the project . The beacon mode is the version under test at the moment.
Opera was designed as an alternative to the QRSS transmission system and provides for a limited number of characters to be transmitted by a serial single keyed tone , as is QRSS or live CW, 6 at the moment.
It is live ‘data’ mode and there is no requirement for time synchronisation of the tx/rx station .
The mode can be transmitted by any transmitter SSB/CW , there being provided a keyed tone and Comm. Port CW key interface
There is a windows ‘gui’ interface and the requirement for RX audio feed, based round 1500 Hz , Tx audio at 1500 Hz may also be used to drive a audio/rf conversion , changes of Tx audio tone prevent collisions, and the software scans for a slot of minimum noise . to place the TX carrier in.
If the CW key option is used, then the Tx frequency is selected by the Tx master oscillator only.
Once a signal is decoded, the decode-spot is distributed to other web-connected users, future development will link to the PSK-Reporting network .
OPERA is coded at the moment for 136 and 500 Khz and still under development.
As a basic out line the system (at the moment) codes the six characters of the call sign and transmits them as a serial ‘pulse’ train using either conventional audio to RF translation , or by the use of a COM port and transistor keying cct that simply replaces the CW key ,
Reception, as the data is spread out along a time line , decoding is completed during the final stages of the transmission , due to this ,,it is not possible to include a receive progress monitor, however the system will track and decode multiple transmissions of both time bases simultaneously
Transmit times are used to denote the mode
500 Khz
2 Minuets
16 Minuets
136 Khz
8 Minuets
65 Minuets
S/N, The mode is capable of decoding under the noise level , beyond that of WSPR or the ROS-MF-2 system with a maximum data loss of 33% before the decode Fails.
Opera 2 similar to WSPR
Opera 8 6dB better than WSPR. Opera 65 9 dB better than Opera8,
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