Hi all,

This possible S. Vicente  CPV  was noted with an error - any help with proving or disproving the validity appreciated ?

(MF=2.1875 MHz) <Selective call to a particular individual station>
Called MMSI station address: 636016376 [Ship] (Liberia)
Category: Safety
MMSI self-identifier: 006170000 [Coast station: 16°51'N 025°00'W S. Vicente MRCC Cape Verde] (Cape Verde)
Telecommand 1: Test
Telecommand 2: No information
Neither RX/TX frequencies nor position supplied
Check Sum: error
Date and time of decoding: 04/05/2019 23:12:40
Codes: 120 120 63 60 16 37 60 108 0 61 70 0 0 118 126 126 126 126 126 126 126 122 51

73,

Peter

On Sun, 5 May 2019 at 19:37, peter via Groups.Io
<peterconway.ndb=talktalk.net@groups.io> wrote:

Hi all,

This possible S. Vicente CPV was noted with an error - any help with proving or disproving the validity appreciated ?

Codes: 120 120 63 60 16 37 60 108 0 61 70 0 0 118 126 126 126 126 126 126 126 122 51

Hi Peter

No doubt the Sage of the Shetlands will have the definitive answer,
but I've just done two XOR checks of the codes
The 'abbreviated' codes (deleting the zeros and surplus 126s), I
think, look like this
120 63 60 16 37 60 108 61 70 118 126 and 122.

120 XOR 63 = 71
71 XOR 60 = 123
123 XOR 16 = 107
107 XOR 37 = 78
78 XOR 60 = 114
114 XOR 108 = 30
30 XOR 61 = 35
35 XOR 70 = 101
101 XOR 118 = 19
109 XOR 126 = 109
109 XOR 122 = 23

So I reckon the last 3 groups should be 126 122 and 23, not 126 122
and 51. I can't see where the 51 comes into it (hence the error?)
unless I'm overlooking something obvious. I need to go into serious
delving mode and it's too late for that today. I hope I haven't made a
complete pig's ear of what I've done so far !
I'm sure all will be revealed in due course.
Nice catch if it's gen

Rich

Hi Rich,

Thanks for your input/deductions..far better than mine..and yes getting too late..bed calling, see what tomorrow brings..

Peter

On Sun, 5 May 2019 at 19:37, peter via Groups.Io
<peterconway.ndb@...> wrote:

Hi all,

This possible S. Vicente  CPV  was noted with an error - any help with proving or disproving the validity appreciated ?

Codes: 120 120 63 60 16 37 60 108 0 61 70 0 0 118 126 126 126 126 126 126 126 122 51

Hi Peter

No doubt the Sage of the Shetlands will have the definitive answer,
but I've just done two XOR checks of the codes
The 'abbreviated' codes (deleting the zeros and surplus 126s), I
think, look like this
120 63 60 16 37 60 108 61 70 118 126 and 122.

120 XOR 63 = 71
71 XOR 60 = 123
123 XOR 16 = 107
107 XOR 37 = 78
78 XOR 60 = 114
114 XOR 108 = 30
30 XOR 61 = 35
35 XOR 70 = 101
101 XOR 118 = 19
109 XOR 126 = 109
109 XOR 122 = 23

So I reckon the last 3 groups should be 126 122 and 23, not 126 122
and 51. I can't see where the 51 comes into it (hence the error?)
unless I'm overlooking something obvious. I need to go into serious
delving mode and it's too late for that today. I hope I haven't made a
complete pig's ear of what I've done so far !
I'm sure all will be revealed in due course.
Nice catch if it's gen

Rich

On Sun, 5 May 2019 at 19:37, peter via Groups.Io
<peterconway.ndb=talktalk.net@groups.io> wrote:

Hi all,

This possible S. Vicente CPV was noted with an error - any help with proving or disproving the validity appreciated ?

-------------------
Peter/folks
As an update, I checked the YADDNet server for any traffic from/to
MMSI number 636016376 (see attachment) at 2312Z yesterday and it looks
like the ship received an ACK from 002570000 (the Norwegian
'one-size-fits-all' station)


Rich

My earlier message:

As an update, I checked the YADDNet server for any traffic from/to
MMSI number 636016376

-------------------

As an updated update, the revised/abbreviated codes for a call to
636016376 from 00257000 would be:

120 63 60 16 37 60 108 25 70 118 126 and 122 which gives an ECC of...
51 no less !

120 XOR 63 = 71
71 XOR 60 = 123
123 XOR 16 = 107
107 XOR 37 = 78
78 XOR 60 = 114
114 XOR 108 = 30
30 XOR 25 = 7
7 XOR 70 = 65
65 XOR 118 = 55
55 XOR 126 = 73
73 XOR 122 = 51, the ECC shown in your original message

Rich

(and it's only a hobby, I keep telling myself)

Thanks for update info Rich.

So it looks like it was 002570000

All good fun....

Peter

My earlier message:

As an update, I checked the YADDNet server for any traffic from/to
MMSI number 636016376

-------------------

As an updated update, the revised/abbreviated codes for a call to
636016376 from 00257000 would be:

120 63 60 16 37 60 108 25 70 118 126 and 122 which gives an ECC of...
51 no less !

120 XOR 63 = 71
71 XOR 60 = 123
123 XOR 16 = 107
107 XOR 37 = 78
78 XOR 60 = 114
114 XOR 108 = 30
30 XOR 25 = 7
7 XOR 70 = 65
65 XOR 118 = 55
55 XOR 126 = 73
73 XOR 122 = 51, the ECC shown in your original message

Rich

(and it's only a hobby, I keep telling myself)