RTTY from DWD Pinneberg, strange corruption.

[G6FGO]

This has me scratching my head. I had a prototype RTTY modem built and reliably receiving the DWD marine weather / shipping forecast on 10MHz as well as 7MHz at 50 Baud and 425 shift. Today I switched it all on to find that it was displaying gibberish. I eventually worked out that the speed was now 75Baud (not per their schedule) and the RYRY tuning signal is fine. However, anything between the RYRY lines is totally incomprehensible, almost like it is encrypted...

7646 kHz​	DDH 7​	00.00 - 24.00 UTC​	1 kW​	F1B	50 Baud​	+ / - 225 Hz​
10100,8 kHz​	DDK 9​	00.00 - 24.00 UTC​	10 kW​	F1B	50 Baud​	+ / - 225 Hz​

.
QYRY

E


AQKCKCCO

E

ERYRYRYRYRYRYRYRYRYRYRYRYRYRYRYRYRYRYJYRYJYRYJYRYRYRYRYRYJYRYRYRY

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!1
FNQ
FQ

ERKCK


QD

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QYSY
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IAQKCKCCO

E

ERYRYRYJ6464646464646464646464646646646464646464646!4)464646 << Figures shift, I know!

,((
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!1

QAFQ

ERKCKAA
QJ

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UYRY
NO
AQKCCCO

E

ERYRYJSYRYJYRSYRYRYJYRYRYRYJYRYRNYRYRYRYRYRYRYRYRJRFRYRYRYRYRY

EKK
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NQA
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FQ

ERKCMAIAIQNI
EIAIQJY
VNT




QKCUUO
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NFJYJRRYSYRYYR464646464646464646464646644446!$64!4644646646,
3KK

 

[ka3jjz]

Hmmm...the upper left of your display shows 75 (baud)? It should be 50 as you say....Mike

 

[G6FGO]

Hmmm...the upper left of your display shows 75 (baud)? It should be 50 as you say....Mike

Yes, at 50 Baud I can't even resolve the RY strings.

 

[G6FGO]

This is a totally separate demodulator I built some time ago, the only thing in common is the audio input. It is preset to 50 Baud and I am showing the same corruption which strongly suggests a change of some sort in the transmission. However, I am seeing the occasional complete word on this one, in between the gibberish. "SOUTHERN BALTIC" for example, showing it is 50 Baud. Signal is strong and audibly as expected, ie no nasty interference causing loss of sync.

 

[G6FGO]

Now this is strange, it has now decided to start working all by itself!

LITTLE, MISTY, SEA 1 METER.



NORTH FRISIAN COAST:

SOUTHWEST 4 TO 5, SHIFTING SOUTH TO SOUTHEAST AND DECREASING A

LITTLE, MISTY.



ELBE FROM HAMBURG TO CUXHAVEN:

SOUTH TO SOUTHEAST 2 TO 3, AT TIMES MISTY WITH FOG.





GERMAN BALTIC SEA:

FLENSBURG TO FEHMARN:

SOUTHWEST 3 TO 4, SHIFTING SOUTH TO SOUTHEAST, AT TIMES MISTY

WITH COASTAL FOG PATCHES.



EAST OF FEHMARN TO RUEGEN:

SOUTHWEST 3 TO 4, SHIFTING SOUTH TO SOUTHEAST, AT TIMES MISTY

WITH COASTAL FOG PATCHES.

 

[merlin]

RYRY round robins went out with the mechanical teleprinters.
Suitable for tuning purposes I guess.