Loggings > Utility
CIS Navy on HF
Josh:
Finally caught some traffic on 8345 this morning a bit after 0600Z when they're sposed to switch to 12464 for the day. Traffic was passed for several minutes, so the day/nite switchover time seems to be a suggestion rather than a maxim.
Got up late so didn't get anything from the greyline on 12464 like normal and thought the game was over, but was surprised to catch a lot of very weak cw a bit after 1400Z.
8345 CW 0206Z 08DEC19
QSA? DE RCJG QRU k NR 195 RPT 1 K
Josh:
8345 1415Z 09DEC19
VVV de RCJG QSA1 QRU K
1421Z
RCJG N722 RPT AR
RCJG RPT AA1 AR MO K
RCV de RCJG N1 772 RPT AR
(RCJG wants RCV to repeat 772)
1427Z
RCV de RCJG NR722 RPT K
1613Z
VVV RCA RCA de RCJG QSA? QTC K
=sml= (5f groups)
77392 etc
8345 0600Z 10DEC19
VVV RCV RCV RCV de RCJG RCJG QSA? QTN
RCV de RCJG QSA1
de RCJG REO QSA?
0615Z
de RCJG RCJG
0618Z
VVV RIW RIW RIW de RCJG RCJG QSA? QTC K
(then into 5f groups)
this guy had problematic element spacing
RCJG is the Ivan Bubnov, a Boris Chilikin class tanker of the Black Sea Fleet
http://www.shipspotting.com/gallery/photo.php?lid=1091287
JCMaxwell:
8345 CW active now 2019z 12/12/19. no interpreter running.
BTW, thanks for all the work you put into this thread Josh.
Josh:
--- Quote from: JCMaxwell on December 12, 2019, 2019 UTC ---8345 CW active now 2019z 12/12/19. no interpreter running.
BTW, thanks for all the work you put into this thread Josh.
--- End quote ---
Glad you find it interesting, it's my tribute to those who taught me, and there are many.
On cw interpreters, here's an video on the subject comparing several;
https://www.youtube.com/watch?v=MRuFn1nnuoY
I find that decent code with no multipath can be correctly copied by the usual sorcerer and etc software decoders, but once a bad fist, qrm/qrn, or multipath appears, it takes a human to make sense of the mush. It's odd but you can hear multipath on a cw note after you've been doing it a while.
Worse yet is Russian Navy doesn't seem to issue keyers to its forces, it issues straight keys, meaning every operator is going to have their own element timings.
Found out the Bubnov is sitting off the coast of Morocco at the moment, so plenty of opportunity for multipath from there to here. Hearing RIW Moscow or RCV Sevastopol is sure to have multipath too.
Speaking of Moscow and Sevastopol, 12464 and 8345 are the primary ship to shore side of the duplex channel, the shore to ship side are;
RIW Moscow 9145, 11000, 14556
RCV Sevastopol 15586, 7566
I've compared several decoders; sorcerer in two versions, K500, WCODE, CW Get, and CW Decoder and they all pretty much perform about the same, perhaps CW Get is a bit better, while WCODE will translate Cyrillic morse - wich I am not good at at all. I let them run overnite or when I'm away or listening to something else with another rig.
One thing I noted is most all of them want about 15 percent cpu time, a bit high to my thinking, setting CW Get to 50 cw signals reduced it to 4 percent, much more to my liking.
CW Decoder dl;
https://download.cnet.com/CW-Decoder/3000-18511_4-75325058.html
Sorcerer dl;
http://www.kd0cq.com/2013/07/sorcerer-decoder-download/
One thing I find useful is to set the input freq of the decoder app to twice the cw note freq.
For example, I always employ 600Hz bfo offset, all cw copied ota will be at that 600Hz tone. Setting the decoder to 1200Hz will allow the second harmonic to trigger the decoder rather than the actual tone at 600Hz plus all the band noise, of course one must make sure a second harmonic is present in the app for this to work - you will verify it in the fft when signals are present. The 1200Hz second harmonic will be pretty much completely free of band noise.
I've been thinking about a means to a better decoder app, one that perhaps employs a pll to;
1 detect a sinewave
and
2 to ensure phase coherence wich will also enhance noise rejection (noise is incoherent) and define elements.
(Not that I know how every decoder works)
Then to have a buffer to copy elements into and look for the averages of an individual senders keying, dits, dahs, spacing, then apply these globally to the message for its entirety -- the above is why humans are better cw decoders than machines as we do all this without thinking about it.
I suspect that a decoder written with these features could decode cw that's beneath the noise floor, and humans can't do that. Smolinksi, I'm looking at you.
You could even determine/identify individual senders this way but that has been done for ages.
Lol using massive compute power of the most complex and modern design to decode the simplest of digital codes, dits and dahs, ones and zeros.
Josh:
8345 0647Z 13DEC19
VVV RIW RIW de RMUW RMUW RMUW NR 63 RPT K
0644Z RMUW RPT
0659Z VVV RIW RIW de RMUW RMUW QSA? K
0700Z RMUW RPT NR 63 RPT QSA?
0702Z RMUW RPT (then into groups)
99360 70060 (errors) 92610 K
0704Z RMUW OK QRI
RMUW is the Shakhter (SB-922), a Sliva class salvage tug of the Black Sea Fleet.
https://www.vesselfinder.com/vessels/SHAKHTERSK-3-IMO-7038642-MMSI-273397210
https://www.vesselfinder.com/?imo=7038642
not too shabby dx for a tiny bobber off the east coast of Russia
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