Message-ID: <DB06658DD5E5434282ABE4A245FF5A4B@PcMinto>
From: Minto Witteveen <minto.witteveen@gmail.com>
To: <rsgb_lf_group@blacksheep.org>
References: <51378EC1.5030309@psk31.plus.com> <5137970B.6060600@iup.uni-heidelberg.de> <5137B214.8070608@kpnmail.nl>
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Date: Wed, 6 Mar 2013 22:30:44 +0100
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Subject: LF: Re: RTTY 478.xxx
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I decode SM6BHZ on 478.165, 45.45 Hz 170 Hz shift..

DE SM6BHZ SM6BHZ JO57WQ GOTENBURG SWEDEN SM6BHZ SM6BHZ K
ISRYN ZI TTZEAE
A

73's Minto pa3bca

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Ceterum censeo Carthaginem delendam esse
-----Original Message----- 
From: pa3abk
Sent: Wednesday, March 06, 2013 22:16
To: rsgb_lf_group@blacksheep.org
Subject: Re: LF: RTTY 478.xxx

Thanks Eddie for the report.
Didn't expect to be that errorfree over  400km  :-)

AMTOR-FEC speed is 100Bd, every character is send twice within a certain
interval.
There is also a checksum on every  7-unit character send which should
have a ratio of 3:4.
The ARQ version is even better, later software was developed in such
that every repeat was overlayed on top of the previous one.
So even under bad condx  3 or 4 repeats gives an errorfree print.

Assume that the shift of 85Hz can't be maintained in order to receive it
"error free" considering the higher baudrate.
But it's worth trying it out.

At the mom 478.2 is somewhat stereophonic, many signals but can't decode
any.


Jan/pa3abk

NNNN



On 6-3-2013 20:20, Stefan Schäfer wrote:
> Hello Eddie,
>
> Yes, very interesting. Jan/PA3ABK told me that AMTOR-FEC is the same as 
> NAVTEX. A quick google search and wikipedia check confirmed that :-) 
> NAVTEX is available in FLDIGI as well, which is fine :-)
> I also installed Multipsk now and managed to decode my RTTY (from Twente) 
> even with that program.
>
> Now i would like to try NAVTEX. Will change to that mode now...
>
> 73, Stefan
>
> Am 06.03.2013 19:45, schrieb g3zjo:
>> Hi LF
>>
>> I am continuing to test RTTY below 478.200 reports very welcome.
>>
>> PA3ABK came up very nicely in QSO with DK7FC.
>>
>> 73 Eddie G3ZJO
>
>


-- 
pa3abk <-> dordrecht jo21it