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Date: Wed, 08 Oct 2014 18:17:02 +0100
From: g3zjo <g3zjo@psk31.plus.com>
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Subject: Re: LF: WSPR and OPERA test 474.2 dial
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Status: O

Thanks for the decodes and timings Graham, with the various reports in 
different places and fleeting nature of the Opera reports (I have to go 
to the shack for those, WSPR is on the Laptop) it takes the view from 
your end to spot it. Additionally I don't know when you are monitoring, 
and I was fiddling about with timings.

The WSPR database confirms there were transmissions at 17:08 and 17:40 
so yep we have Opera8 extending down into the noise a bit, as it should.
Tonight will be interesting, with the higher power we have a new 
opportunity for seeing more.

Of course, yes, they are different systems its just the usefulness I am 
interested in.

I have now added another chance of a WSPR2 decode into the test frame 
period, actually we should have 4 chances aye.

73 Eddie

On 08/10/2014 16:58, Graham wrote:
>
> ''So I am still looking for WSPR2 to disappear into the noise and OP8 
> to produce reports''.
>
> That's   exactly  what  happened ! :)
>
> OP8 has a  lower  decode threshold  that  wspr-2 and provides  
> functionality in higher  noise  levels  , ie  after  dark  static , as 
> can be  seen from the  two  decodes  at  -33  and  -32  dB
>
> I took  one   wspr-2   and  3  x  OP8 decode  from  you  ,  the  only 
> wspr-2  decode  , at  16:40 / 16:38
>
> Wspr  reported  peak  s/n of  -31 dB   , Opera  8  gave a  average  
> level of  -32 dB , with  fade / loss  of 12% of  signal
> This  would  suggest , the  path  was  reasonably  constant and  was 
> in 100%  daylight   at that  time.
>
> Two further  OP8 decodes  occurred  at  17:06  and  17:38 going into 
> darkness  ,  no  other low  level  decodes Op8 or wspr  occurred , and 
> at around  20:30 z   I reverted  to  477 KHz .
>
> Dont  forget , these  are  two  totally  different  systems , one 
> is    4FSK time  division  system  , the  other  Manchester coded  
> OOK    Opera  is in use  from  Lf to  10 GHz  , with the  same  bit  
> pattern ,  just the  time and  dsp  parameters  are  changed to  match 
> the  requirements, ''as versatile as a egg''  as the  advert used to 
> say..
>
> 73-Graham
> G0NBD
>
>
>
> As our  North  Mediterranean VHF  users  find ...using  Op05  on 2 meters
>
> Crazy gang rise again ! ;-)
>
> EA9MH    I1PSC    2m    OPERA    1439 km    20:19:53
>
> Today we have an unusual link from EB5EA in north Valencia to EA9MH in 
> Melilla crossing a landa path
> full of >1500m mountains. Not usual !
>
>
> 474.2  Test  results  as  viewed  from  Io83LK
>
> 2014-10-07 16:40 G3ZJO 0.475728 -31 0 IO92ng 0.001 G0NBD  IO83lk 195 313
>
>
> 17:38    477 G3ZJO Op8 -32 dB
>  |--------------- ------------------------- --------- 
> ------------------ -----
> -     ----- - -- ---- ------- -----  ------| Fade: 13%
> 17:06    477 G3ZJO Op8 -33 dB
>  |-- ----------------------- ------------------- ----------  --- - 
> ----- --------
> - ----------- ------- -- ------------ -| Fade: 12%
> 16:38    477 G3ZJO Op8 -32 dB
> ------ ----- ------------ -------       --     ------------------- 
> -----------------------------
> ------ ------------- | Fade: 15%
>
>
>
>
>
>
>
>
> --------------------------------------------------
> From: "g3zjo" <g3zjo@psk31.plus.com>
> Sent: Wednesday, October 08, 2014 12:20 PM
> To: <rsgb_lf_group@blacksheep.org>
> Subject: Re: LF: WSPR and OPERA test 474.2 dial
>
>> On 06/10/2014 15:23, Gary - G4WGT wrote:
>>> When are you starting your tests ??
>>>
>>> I have set up at this end.
>>
>> Hello Gary / LF
>>
>> Gary you got the 11:08 Opera8 transmission then.:-)
>>
>> I have put the 10W PA on now for a further period of test, OP8 v 
>> WSPR2. Results so far using QRPp show the same as my tests in 2012.
>> Op8 shows higher noise reports than WSPR2, both modes drop out at the 
>> same level, OP8 takes four times as long to do it.
>>
>> So I am still looking for WSPR2 to disappear into the noise and OP8 
>> to produce reports.
>>
>> 73 Eddie G3ZJO
>>
>
>
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