Talk:OPERA Beacon and Data
My Issues with this entry :
1 "Opera" seems to referring to the decoding / monitoring software and not the actual signal type,
which makes this look more like a advertisement for the software and not a signal
2 Some frequncies listed fall into the amature radio band ,
so the signal may not be herd " worldwide " as described in signal location info block,
and are in use by other systems / users for other types of transmissions .
More Exact location of reception of said signals should be noted / listed.
3 The video is only of some one transmitting something using the opera software, and not actually receiving the signal.
The only audio that is herd sound like typical CWContinuous Wave Morse code transmissions
4 If this entry represents a beacon, it should indicate a identifier of the beacon station if it is known. --Mbeam (talk) 11:22, 23 August 2016 (NZST)
I looked into OPERA a long time ago as a candidate signal to add but I couldn't really find much about it's signal characteristics, so I don't really know what uniqueness the signal itself has. I think its a special form of ASKAmplitude-Shift Keying, sounding like morse code but has some other stuff(?), i'm not sure. I do agree a rework is needed. Just a point for #2 signals that do not have a primary localized location or singular location of transmission I would consider 'Worldwide' simply because it is used by many amateur radio operators all over the world. The frequencies used may not be the same but that's something that should be elaborated upon in a 'Frequencies' section. --Cartoonman (talk) 00:22, 24 August 2016 (NZST)
I have done previous research into the author's other project ROS, and I am aware of discrepancies about the legality of using it in the United States. This is purely because the author claimed his mode uses spread spectrum, which to the FCC is not allowed on HFHigh Frequency (3-30 MHz) bands for amateur use, but some people have criticized this saying that his mode doesn't really use spread spectrum, but it's a mess and the general consensus is that it is not legal in the US but fine elsewhere, like in Europe.
This is why I kept it objective regarding the detail of spread spectrum in ROS. For OPERA, it seems from the information you gathered, that it is a special OOKOn-Off Keying Modulation signal that transmits specific information with some coding thats supposed to be optimized for low-power usage. --Cartoonman (talk) 13:26, 24 August 2016 (NZST)
Gathered Info[edit]
( for use in editing / reworking main page )
Appears to be a new type of signal transmission Created by : José Alberto Nieto Ros
http://www.qsl.net/g0hdi/opera.htm
For amature radio use
https://rosmodem.wordpress.com/author/rosmodem/
Info taken from a facebook post discussion :
Opera
Opera is a weak signal beacon mode developed by Jose Alberto Nieto Ros (EA5HVK). Just as WSPR, it is not a QSO mode.
It also uses forward error correction and a compressed data format in order to improve SNR.
A main difference between Opera and WSPR is that Opera uses "on/off" keying instead of FSKFrequency-Shift Keying.
The advantage is that any CWContinuous Wave transmitter can be used, the inherent disadvantage is a 3 dBThe decibel (dB) is a logarithmic unit used to express the ratio of two values of a physical quantity, here the strength of a received signal. lower average power compared to FSKFrequency-Shift Keying modulation.
In contradiction to WSPR (and also JT9-1, WSQ) the code of Opera is not open source. The "deep search" functionality of Opera,
that takes advantage of information exchange over internet as an aid to decode very weak signals, is rather contested.
( Note Deep search = correlation , Decode and Detection Time stamps are pooled to validate ,
Non web-linked PC's still decode/detect , but its to the user to satisfy the validity of the spot ,
a normal decode extracts the CALL from the rx data , correlation checks against a list for match ,
false decode = call format random characters false detection = valid call random time ,, time is the validation check' - 12345G54321 )
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Draw a line under that :(
Unlike wspr , there IS a QSO version 1-4-1 15 ch plain text -20 db s/n -3 dBThe decibel (dB) is a logarithmic unit used to express the ratio of two values of a physical quantity, here the strength of a received signal. Inherent disadvantage,
using the same power level ?
Opera has a much higher efficiency, energy/ power transfer is the measure , when the TXTransmit is off , cannot be wasting power , what energy that is transferred is more efficiently utilized by the DSP and is immune to Doppler spread...
Opera is not open source - strange , was only lately , wspr and JT modes admitted to using correlation [deep search] when some MFMedium Frequency (300-3000 kHz) stations printed non-active call's ,
just like oop's and uses multi pass - obviously very open ..and being time-locked , virtually impossible to tell spots are real or false
Ah, the old web linking bit, Dammed to understand how Opera 8 and 32 , reach such low -s/n levels , Obviously must CHEAT .. ,
strangely Opera Op8/32 deep search, works when the PC is NOT linked to the web....
What's contested is , where as wspr is time locked , multi pass and you don't actually know , which pass caused the spot , or if your spot is real or false , Opera and Dynamic are single pass .
Opera is too simple , too honest and too technically advanced
Why the WWW ? checks the time stamp to validate Dynamic spots .. simple ..shockingly so :) and only used on the 136/477 bands, the others are simple single pass data ...
Another Facebook post
So the latest news on ROS is that the inventor (one José Alberto Nieto Ros) has taken to falsifying communications from the FCC in order to create the appearance that his mode is legal.
