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" <[email protected]>
Sent: Wednesday, October 08, 2014 12:20 PM
To: <[email protected]>
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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