[GreenKeys] off air NAVTEXT, SITOR-B recordings

[tony.podrasky]

GE OMs;

Paul - if you get any volunteers please let me know or else
forward a copy of the NAVTEX signal.

I was hoping that W1AW would work - but they've stopped sending
out SITOR digital transmissions.

I'd prefer the 2125/2295Hz tones but I'll take what I can.

Oh - BTW - there is a part that needs to be changed in the ST-6 to
make it work better at 100 WPM. I don't know if the ST-5000 is the same.

I'm trying to set a UAR/T to sample the transmissions at a high enough
rate that I can use it instead of a synchronous interface - but I need
a transmission AND the hard copy to know how I'm doing. I did manage
to "copy" one of WLO's SITOR transmissions - and I had the UAR/T locked
on well enough that the pattens kept repeating in the log file.

UE,
K2EAA - TONY
NNNN
ZCZC


On 12/16/2014 04:51 PM, Christian Gauger-Cosgrove wrote:

>
> On 16 December 2014 at 12:01, paul at paulnewland.com <paul at paulnewland.com> wrote:
>> I'm working on having an Arduino Uno microcomputer decode SITOR-B (FEC)
>> signals (Baudot RTTY TX and RX to an LCD display is working on the Arduino
>> now) and would like to work with some off-the-air signals.  Unfortunately,
>> at the moment, I'm in the position of having poor antennas and a broken
>> radio receiver.
>>
>> Is there someone who is near a US or Canadian 518 kHz Navtext station who
>> can digitally record the audio output of their radio when monitoring a
>> NAVTEX broadcast and either Dropbox or FTP me the sound file?  I can give
>> you an account on my FTP server.  1615/1785 Hz tones would be preferred as
>> I'm using a simple PLL as my test FSK decoder (hence the need for a solid
>> audio signal), although I can make 2125/2295 Hz work with the PLL.  I would
>> use 2125/2295 HZ with my ST-5000 but the filters in the ST-5000 seem too
>> narrow to deal with the 100 bps FSK signal.  Either Normal or Reversed tones
>> are both fine.  I can invert the data in the microcomputer.
>>
>> thank you.
>>
>> Paul Newland, ad7i
>>
>>
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