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Date: Mon, 2 Jan 2012 09:38:39 +0000
Message-ID: <CAA8k23R5KKJnhiS-+Y2JRVoixJt0u4iKBPeiriAiqE4_ryBcPw@mail.gmail.com>
From: Andy Talbot <andy.g4jnt@gmail.com>
To: rsgb_lf_group@blacksheep.org
Subject: Re: LF: OPERA The new CW / QRSS replacement data mode
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So what is the coding, the error correction, the decoding scheme.
Come on, in the amateur radio world there's no need for keeping such
things secret

You can't beat Shannon - ON/OFF in a particular bandwidth with decent
FEC will always give the same performance, so what are the innards of
this one?

Andy
www.g4jnt.com


On 2 January 2012 00:08, Graham <g8fzk@g8fzk.fsnet.co.uk> wrote:
> All,
>
>
>
> After=A0 some=A0 time=A0 in development=A0 the=A0 136/500=A0 version=A0 o=
f the=A0 Opera
> data=A0 mode=A0 is=A0 ready=A0 for=A0=A0experimental=A0 use .
>
>
>
> Download=A0 links=A0 are=A0 available=A0 from=A0 myself=A0 or=A0 Gary, G4=
WGT=A0 as the
> versions=A0 may=A0 change=A0 , these=A0 may=A0 also=A0 change=A0 ,
>
>
>
> Users=A0 are=A0 invited=A0 to=A0 join the=A0 Opera=A0 yahoo=A0=A0 group
> http://groups.yahoo.com/group/O_P_E_R_A_/?yguid=3D131323118
>
>
>
> At the=A0 moment=A0, spots=A0 are=A0 distributed to=A0 other=A0 OP users=
=A0 on line=A0 at
> the time ,. future intent=A0 is to=A0 link=A0=A0 to=A0 the=A0 PSK-Reporti=
ng=A0 network
> and=A0 for=A0 a=A0 HF version=A0 and=A0 possible=A0 limited =A0QSO=A0 mod=
e=A0, allowing
> under=A0 the=A0 noise=A0 qso's=A0 with=A0 a simple=A0 xtal=A0 tx
>
>
>
> There=A0 is a=A0 on line=A0 chat=A0 mode=A0to=A0 facilitate=A0 tests=A0 e=
tc
>
>
>
> The=A0 software=A0 is=A0 available=A0 for=A0 all=A0 , free=A0 to=A0 use=
=A0 ,
>
>
>
> Happy=A0 new year=A0 to=A0 all=A0 and=A0 good=A0 luck
>
>
>
> 73-G ..
>
>
>
>
>
>
>
>
>
>
>
>
>
> OPERA=A0 The=A0 new=A0 CW/ QRSS =A0replacement=A0=A0 data mode
>
>
>
> There=A0 is=A0 always the=A0 assumption that=A0 all=A0=A0 armature=A0 rad=
io=A0 stations
> can=A0 effectively=A0=A0 translate=A0 what=A0 ever=A0 new=A0 soundcard=A0=
 data=A0 mode=A0 that
> is=A0 coded to=A0 radio=A0 frequency..
>
>
>
> The=A0 question=A0 I posed was=A0 =91What=A0 about=A0 those=A0 who=A0 can=
not , and=A0 only
> have=A0 CW transmission=A0 facility=92s=92? =85
>
>
>
> Never did get a reply
>
>
>
> So=A0 after a=A0 long=A0 exchange=A0 of emails , the=A0 concept=A0 of=A0 =
a=A0 serial=A0 data
> mode that=A0 used only=A0 one=A0 tone=A0 , on/off=A0 keyed , with a=A0 ey=
e=A0 on the
> qrss=A0 system,=A0 was=A0 finally=A0 discussed=A0 and=A0 coding=A0 work=
=A0 begun, an
> initial=A0 statement=A0 that in software , could=A0 be =A0achieved=A0 a l=
ower=A0 level
> of=A0 detection=A0 than that=A0 required to=A0 produce a=A0 line=A0 on a=
=A0 spectrum=A0 plot
> set the=A0 scene for=A0 a=A0 what=A0 was=A0 originally=A0 proposed to=A0 =
be a=A0 simple
> data=A0 mode, turned into to=A0 a=A0 race to the=A0 noise=A0 floor.
>
>
>
>
>
> OPERA
>
>
>
> Is=A0 a totally=A0=A0 new=A0=A0 Data=A0 / Beacon=A0 mode ,=A0 profiled=A0=
 for the=A0 136=A0 and
> 500=A0 bands=A0 , with=A0 HF=A0 possibility=92s=A0=A0 later=A0 in the=A0 =
project . The beacon
> mode is the version under test at the moment.
>
>
>
> Opera=A0 was=A0 designed=A0 as an alternative=A0 to the=A0 QRSS=A0 transm=
ission=A0 system
> and=A0 provides=A0 for a=A0 limited=A0 number of characters to=A0 be=A0 t=
ransmitted by
> a=A0 serial=A0 single=A0 keyed=A0 tone=A0 , as=A0 is=A0 QRSS=A0=A0 or=A0 =
live=A0 CW, 6 at the
> moment.
>
>
>
> It is=A0 live=A0 =91data=92 mode and=A0 there=A0 is=A0 no=A0 requirement=
=A0 for=A0 time
> synchronisation=A0 of the=A0 tx/rx=A0 station .
>
>
>
> The=A0 mode=A0 can=A0 be=A0 transmitted=A0 by=A0 any=A0 transmitter=A0 SS=
B/CW , there
> being=A0 provided=A0 a=A0 keyed tone=A0 and=A0=A0 Comm.=A0 Port=A0 CW=A0=
=A0 key interface
>
>
>
> There=A0 is=A0 a=A0 windows =91gui=92 interface=A0=A0 and=A0 the=A0 requi=
rement for=A0=A0 RX
> audio=A0 feed,=A0 based=A0 round 1500 Hz , Tx=A0 audio=A0 at 1500 Hz may=
=A0 also=A0 be
> used to=A0 drive=A0 a=A0 audio/rf conversion ,=A0 changes=A0 of=A0 Tx=A0 =
audio tone
> prevent collisions, and the=A0 software scans=A0 for a=A0 slot of minimum=
 noise .
> to=A0 place the=A0 TX carrier=A0 in.
>
>
>
> If the=A0 CW key option is=A0 used, then the=A0 Tx frequency=A0 is=A0 sel=
ected=A0 by
> the=A0 Tx master oscillator=A0 only.
>
>
>
> Once a signal is decoded, the decode-spot is distributed to other
> web-connected=A0=A0 users, future development=A0 will=A0 link to the=A0 P=
SK-Reporting
> network .
>
>
>
>
>
> OPERA=A0 is coded=A0 at the=A0 moment=A0 for=A0 136=A0 and=A0 500 Khz=A0 =
=A0and=A0 still=A0 under
> development.
>
>
>
> As=A0 a=A0 basic=A0 out=A0 line=A0 the=A0 system (at the=A0 moment) codes=
=A0 the=A0 six
> characters=A0 of the=A0 call=A0 sign=A0 and=A0 transmits=A0 them as a=A0 =
serial=A0 =91pulse=92
> train using=A0 either=A0 conventional=A0 audio=A0 to=A0 RF=A0 translation=
=A0 , or=A0 by
> the=A0 use of=A0 a=A0 COM port=A0 and=A0 transistor=A0 keying=A0 cct=A0 t=
hat=A0 simply
> replaces the CW key ,
>
>
>
> Reception, as the=A0 data=A0=A0 is=A0 spread=A0 out along=A0 a=A0 time=A0=
 line , decoding
> is completed=A0 during the=A0 final=A0 stages of the=A0 transmission , du=
e to=A0 this
> ,,it=A0 is not=A0 possible=A0 to=A0 include a=A0 receive=A0 progress=A0 m=
onitor, however
> the=A0 system=A0 will=A0 track and=A0 decode=A0 multiple transmissions=A0=
 of=A0 both time
> bases simultaneously
>
>
>
>
>
> Transmit times are=A0 used to=A0 denote=A0 the=A0 mode
>
>
>
> 500 Khz
>
>
>
> 2=A0=A0=A0=A0=A0=A0=A0 Minuets
>
> 16=A0=A0=A0=A0=A0 Minuets
>
>
>
> 136 Khz
>
>
>
> 8=A0=A0=A0=A0=A0=A0=A0 =A0 Minuets
>
> 65=A0=A0=A0=A0=A0 =A0 Minuets
>
>
>
>
>
>
>
> S/N, The=A0 mode=A0 is=A0 capable=A0 of=A0 decoding=A0 under the=A0 noise=
 level=A0 , beyond
> that=A0 of=A0 WSPR=A0 or the=A0 ROS-MF-2=A0=A0 system with a=A0 maximum=
=A0 data=A0 loss=A0of
> 33%=A0 before=A0 the=A0 decode Fails.
>
>
>
> Opera 2 =A0=A0=A0 similar to WSPR
>
>
> Opera 8=A0=A0=A0=A0 6dB better than WSPR.
>
>
>
> Opera 65=A0=A0 9 dB better than Opera8,
>
>
>
>
>
>