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Rtty Protocol



 
 
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  #11  
Old February 12th 05, 08:16 PM
Mark Zenier
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In article ,
Greg wrote:

From: "Ralph Mowery"
Organization: EarthLink Inc. -- http://www.EarthLink.net
Newsgroups: rec.radio.shortwave,rec.radio.amateur.digital.misc ,rec.ham-radio
Date: Sat, 12 Feb 2005 13:08:16 GMT
Subject: Rtty Protocol

Most hams are received in the LSB mode. Comercial statisons usually are
received in the USB mode or the reversed mark/space relationship. Also the
speed (baud rate) and shift are usually differant than the normal ham 45
baud (60 wpm) and 170 Hz shift.



"B.R. Smith" wrote in message
...
I am using Ham Scope and Mmtty to decode RTTY with my sound card. It
works fine for hame radio operators but I have found RTTY on non-ham
frquencies and all I get is garbage. For example, there is an RTTY
signal at approximately 2.042 MHZ at 1100 UTC on the West Coast and
all that displays is random characters. I suspect it has something to
do with the protocol or baud rate settings. Anyone know what they
might be? Not sure if this is maritime station or not. Thanks.



Okay, I have some questions about RTTY:

1. What unencrypted RTTY traffic is out there besides hams?


For 5 bit asynch (start and stop bits using Murray code), not much.
There may still be some very cryptic weather reports, and maybe the
North Korean news service is still at it.

Ex-Soviet maritime traffic uses a code where the Cyrillic charaters are
mapped to their close Latin alphabet phonetic matches so you can sort
of read it.

TOR, (which is actually two different ways of packaging 5 bit RTTY with
some error correction), will have some maritime traffic. There are
probably FEC-TOR weather reports from the various coast guards around
the world on shortwave , and a system that runs down on 512? kHz for
maritime information. FEC-TOR is a 100 baud narrow shift continuous
transmission. ARQ-TOR is the dREEP-dREEP-dREEP of three character blocks
or the 1? character reply from the other station. Hams use half duplex
ARQ-TOR where the same frequency is used for both stations, maritime
channels are full duplex.

2. What sort of encoder would I need to read RTTY with my NRD-525 and what
do I need to know to get it functioning?


A lot of the 1980's vintage packet controllers had numerous monitoring modes.
I built the Heathkit version of AEA's PK-232 and it will copy RTTY, TOR,
AX.25, even weather fax if you have a graphics printer of that vintage.

3. My receiver has an RTTY mode. What exactly does that do in my receiver?
Couldn't I just use USB or LSB?


Maritime RTTY channels are on .5 kHz spacing, a bit too narrow for a 2 kHz
wide USB filter if the band is busy.

Mark Zenier Washington State resident



  #12  
Old February 13th 05, 02:45 AM
Nobody
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Posts: n/a
Default

On Sat, 12 Feb 2005 09:23:22 -0800, Dr.Anton wrote:

In article .com,
says...

Uncalled-for insults removed

Well, that'll teach me to keep my filter file up to date.

*PLONK!*


ROFL!
Well done Dr.

Mike

  #13  
Old February 13th 05, 06:14 AM
Chuck Reti
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In article ,
Greg wrote:

...I haven't gone to the links yes but I'm
betting there's not a lot of RTTY software for my Apple computer. That's
why I thought of a standalone decoder, like an MFJ or something. But it's
probably not worth the trouble if, as you say, there isn't much RTTY traffic
out there.


"Multimode OS9 and OS X versions
http://www.blackcatsystems.com

CocoaModem (new)
http://homepage.mac.com/chen/

Good list of software (check datacom/tnc section) at
http://www.machamradio.com/HamsAndX.html

Mac Ham Software Webring
http://w.webring.com/hub?ring=applemacintosham

Lots of ham band traffic on RTTY contest weekends. Look into PSK31 as
well.
--
Chuck Reti
WV8A
Detroit MI
  #14  
Old February 14th 05, 02:01 PM
Charles Brabham
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"ryan wiehle" wrote in message
...
Greg wrote:

there used to be press services on RTTY.


The last non-ham RTTY station I remember receiving was a news service for
North Korea, years ago.

I had a PK-232 TNC, with it's SIAM ( signal identification ) mode that would
sniff out the parameters on a mystery signal and attempt to display it for
you. It worked pretty well, I thought, decoding oddball digital stuff more
often than I expected it to.

It was strange to see outdated old Soviet propaganda phrases about
"imperialist capitalist dogs" and about how the standard of living in North
Korea had gotten so good that they were having to turn Americans immigrants
away from the border, seeking asylum.

I've looked for - but not found - anything quite so funny and tragic at the
same time as that RTTY news service from "the people's democratic republic
of Korea" or whatever it was called back then. - It's been a while, I can't
remember for sure.


Charles Brabham, N5PVL

Director: USPacket http://www.uspacket.org
Admin: HamBlog.Com http://www.hamblog.com
Weblog: http://www.hamblog.com/blog_n5pvl.php





  #15  
Old February 14th 05, 02:26 PM
Tom Sevart
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You can read that same good ol' commie propaganda online at
http://www.kcna.co.jp/ .


--
Tom Sevart N2UHC
Frontenac, KS
http://www.geocities.com/n2uhc


 




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