OPERA: nouveau mode LF / MF par G4WGT

Vos écoutes - Vos observations
F4DTL
Animateur
Messages : 1553
Inscription : 10 mars 2008, 23:07
Localisation : Ris Orangis JN18FP

OPERA: nouveau mode LF / MF par G4WGT

Message par F4DTL » 02 janvier 2012, 01:18

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 ... =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-G0NBD


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,

F4DTL
Animateur
Messages : 1553
Inscription : 10 mars 2008, 23:07
Localisation : Ris Orangis JN18FP

Re: OPERA: nouveau mode LF / MF par G0NBD

Message par F4DTL » 02 janvier 2012, 01:24

Come the New Year cometh a new data mode

In a changing technical world, perhaps not being an expert allows you to ask questions that may not be considered technically elegant; such was the case …..
Passing by unnoticed on 30/12/2011 on 137.5 from 20:00 z was a set of variable length pulses over a 8 minuet repeating every 5 minuets, in essence a test transmission of a new data mode , from Gary G4WGT with the intent of crossing the pond to Joe V01NA, using a transmitting station that could be described as the standard MK1 UK back garden VLF Array .
A 12 meter end fed vertical with a contemporary 2 meter square wire capacity hat, fed via matching transformer and 400 watt class d amplifier .. ERP maximum? may be round 300mW , certainly well below the 1 W erp max .
Rain had reduced the safe power level to some 200 watts at the start of the tests , decodes from UK where achieved, but as the monitoring computer Joe VO1NA uses , is not web linked , no confirmation could be expected till much later of a decode , or use made of the internet chat link…harsh conditions in a grabber and wspr world ..
With a break in the weather ,power was increased 3dB to 400 watts round 22:00z , at this point one of the UK monitoring stations closed , leaving myself and it was hoped Joe , on frequency . notably Joe’s 136 beacon was not running that night ..the only good sign up till then …With no further UK or EU decodes other than mine, the test ended 0020z
Followed one of those silent periods , with no web reporting , this was a real vintage attempt using a modern system .

The next day ... Possibly not totally unexpected came a email

F4DTL
Animateur
Messages : 1553
Inscription : 10 mars 2008, 23:07
Localisation : Ris Orangis JN18FP

Re: OPERA: nouveau mode LF / MF par G0NBD

Message par F4DTL » 02 janvier 2012, 13:55

All

Latest version of Opera is available at :-

http://www.mediafire.com/?yvib6olc9s0cup6


Simple set up
Un-zip to folder , run the set-up exe
Populate user info / soundcard / com port
save and run
Band select sets mode
RX mode select is automatic
Mode switch only sets TX speed

USE OPERA V1.0.0 exe


XXXX DO NOT USE THE AUDIO DRIVE FOR OP65 XXXX
XXXX The auto frequency select can take the signal out of the band XXXX
XXXX Known development problem XXXX

73 -G0NBD.

F4DTL
Animateur
Messages : 1553
Inscription : 10 mars 2008, 23:07
Localisation : Ris Orangis JN18FP

Re: OPERA: nouveau mode LF / MF par G0NBD

Message par F4DTL » 02 janvier 2012, 20:49

Image

F4DTL
Animateur
Messages : 1553
Inscription : 10 mars 2008, 23:07
Localisation : Ris Orangis JN18FP

Re: OPERA: nouveau mode LF / MF par G0NBD

Message par F4DTL » 03 janvier 2012, 00:32

Tnx All for running Op this evening ,

Updates from the tests embodied

New version ## 2/1/2012 Short call fixed .

New Opera 34 Mode. Range: From 137.3 to 137.5 Khz

Short call fixed

>>> NOT COMPATIBLE WITH OLD VERSION <<<

http://www.mediafire.com/?xaru838hy2mjjfv

Over range problem with OP65 audio drive now resolved
new version op34 min introduced

F4DTL
Animateur
Messages : 1553
Inscription : 10 mars 2008, 23:07
Localisation : Ris Orangis JN18FP

Re: OPERA: nouveau mode LF / MF par G0NBD

Message par F4DTL » 03 janvier 2012, 00:33

Image

F4DTL
Animateur
Messages : 1553
Inscription : 10 mars 2008, 23:07
Localisation : Ris Orangis JN18FP

Re: OPERA: nouveau mode LF / MF par G0NBD

Message par F4DTL » 03 janvier 2012, 13:35

Pas mal de BUGs pour la premiere version beta, G0NBD et moi meme avons fait des tests cette nuit, avec le QSB du 600m, la reception devient mauvaise et le message de l'indicatif devient erroné par le logiciel d'ou ces reports fantaisistes.

G0NDB travaille sur les ameliorations à venir.

F4DTL
Animateur
Messages : 1553
Inscription : 10 mars 2008, 23:07
Localisation : Ris Orangis JN18FP

Re: OPERA: nouveau mode LF / MF par G0NBD

Message par F4DTL » 03 janvier 2012, 19:26

NEW VERSION - 3/2/2012 1726 Hrs z

This is the latest version..

New TX code is 12% shorter Tx time

Pls all delete all previous versions

http://www.mediafire.com/?b54fku1q3694592

73 G..

F4DTL
Animateur
Messages : 1553
Inscription : 10 mars 2008, 23:07
Localisation : Ris Orangis JN18FP

Re: OPERA: nouveau mode LF / MF par G0NBD

Message par F4DTL » 03 janvier 2012, 23:02

Pas mal de monde pour cette 2eme soirée de tests en OPERA 500 kHz.

Image

F4DTL
Animateur
Messages : 1553
Inscription : 10 mars 2008, 23:07
Localisation : Ris Orangis JN18FP

Re: OPERA: nouveau mode LF / MF par G0NBD

Message par F4DTL » 04 janvier 2012, 14:56

All,

Thanks to all for trying OP out , development continues
Bearing heading issue fixed

This is the last version, Not compatible with other version's

http://www.mediafire.com/?w74a061m48nv806

Please remove ALL OLD VERSION'S !!

73 -G..

Répondre

Revenir à « Trafic 600 mètres QRSS/CW/PSK31 »