''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
|
