Hi Markus –DF6NM.
That is interesting and very starnge.
I am using here the Opera v1.4.7 without sound card and a Lap-Top (HP
Pavilion g series).
The same Lap-Top I am using for long time for my JT65b 2m EME qsos, without
problems.
I am in cw mode with a 2n2222 transistor keying the YUMA transmitter in CW
mode.
My transmitting QRG (dial) is 137.540.
Please let me know what is the reason of this problem.
73 and TNX fro reports.
Spiros,
you'r signal is strong and consistent here in 4X,
but interestingly I'm getting multiple detections from different slices of the
same transmission. The timestamp shift seems to indicate that the match for the
later parts is 20 or 30 seconds delayed compared to the early part. This would
mean that either my receiver is too fast, or that your transmitter is too slow
by about 1%. In the latter case, I would also expect that the conventional
decoder would have difficulties to get a decode.
Perhaps you might want to check the samplerate of
the soundcard used for transmitting. You could also try to measure the duration
of the Opera sequence - it should be 8.192 seconds per (half-)symbol, or 32min
46sec for the whole sequence.
13:19:20 SV8CS 1437km 137540.091Hz
140mHz -38.9dBOp 78% 18.7dB
13:19:33 SV8CS 1437km
137540.080Hz 154mHz -37.2dBOp 98% 16.2dB
13:19:42 SV8CS
1437km 137540.080Hz 150mHz -38.0dBOp 68% 15.1dB
Best73,
Markus
Sent: Tuesday, March 12, 2013 2:14 PM
Subject: Re: LF: Op32 last night
Spiros,
here you are:
13:19:21 SV8CS 1437km 137540.083Hz
124mHz -38.8dBOp 48% 17.4dB
This was at 13:02, after 48% of
the sequence had been received.
Best 73,
Markus
Sent: Tuesday, March 12, 2013 11:33 AM
Subject: Re: LF: Op32 last night
Spiros, LF,
several detections of your signal appeared in
Northern Israel last night, along with a couple from UA4WPF and RN3AGC. Chris
who had been running the software in Bucharest the other night got similar
results.
I am currently leaving the receiver on during the
daytime, and the noise appears to be quite low. So if you decided to transmit
this afternoon there might be a good chance for a daylight
detection.
Best 73,
Markus (4X/DF6NM in
KM73TD)
UT
call distance frequency bandwidth SNR
correlation
2013-03-11:
22:37:17 SV8CS 1437km
137540.006Hz 176mHz -39.0dBOp 90% 19.0dB
2013-03-12:
00:29:12 UA4WPF 2960km
137541.990Hz 2mHz -45.3dBOp 66% 16.7dB
00:50:36
SV8CS 1437km 137540.046Hz 146mHz -38.8dBOp 100% 20.4dB
02:30:24
SV8CS 1437km 137540.033Hz 159mHz -40.7dBOp 100% 18.7dB
04:10:12
SV8CS 1437km 137540.015Hz 163mHz -37.4dBOp 47%
18.5dB
05:21:24 SV8CS 1437km 137540.007Hz 136mHz -38.0dBOp 100%
19.3dB
06:18:16 RN3AGC 2534km 137557.000Hz 3mHz
-50.5dBOp 83% 15.9dB
Sent: Tuesday, March 12, 2013 5:42 AM
Subject: LF: Op32 last night
Captured in Op 32
23:54 136 UA4WPF de SV8CS Op32 3186 km
-39 dB in ZAKYNTHOS Isl.
Spiros/SV8CS
