[Collins] NNNN: Collins Digest, Vol 15, Issue 24

Ean Retief duratel at hotmail.com
Sun Jul 24 10:14:56 EDT 2005 

==============================================================
P.J. (Ean) Retief - DURATEL CC, c/o HALLIBURTON - GABON
Office Tel:  +44 1224 75-6830, +1 281 983-4980 or +241 56-0072
Extension 6852    Facsimile:  +44 1224 75-6831 or +241 56-1431
Cellphone: +241 05 30-3864   Alt. E-Mail: Retief at Duratel.co.za
==============================================================

I may just mention that in the ICAO and most Weather services
asscociated with it, apart from NNNN at the end, the start of the
message is ZCZC.

A typical message header may be:

ZCZC GP077 241349 AAZA 241400
FAHQ FAGE 24 JULY 2005

ZCZC = Start of message
GP077 = message number going out from a certain station
241359 = Date and time group of "handing in" the message
AAZA = Aircraft movement message (MMZA = Meteriological mess.)
241400 = Actual time of transmission (always GMT/UTC date & time)
FAHQ = Callsign of sending station
FAGE = Callsign of receiving station
Follwed by date put on by the originator.

Sometimes the "Station serial number" second group and the TX
callsign may differ if the actual tranmission takes place from a
different site, for instance in the case of a small meteriological
station or small airfield that have telephoned the message trough to
a main transmitting station.

As far as the ending "NNNN" goes, that may differ from system to
system how it is actually practically done.

For automated precessing of a metereological teleprinter message
you would 'line feed' down eight lines and end the message and
start the new one immediately:

NNNN ZCZC GP078 MMZA 241359

But for "written correspondance" normally one would line feed
down the eight lines, type NNNN and then line feed another four
lines and then start the new ZCZC. This leaves enough space for
paper messages to be "torn off" in the space between NNNN and
the nest ZCZC.

In certain military systems at the end of the message you feed
four lines down, then type BT, then another eight line-feeds
before NNNN.

73,
     Ean ZS1PR/TR8


>From: "Cam and Juli Hedrick" <walnutcreek at appstate.net>
>To: <collins at mailman.qth.net>
>Subject: [Collins] RE: Collins Digest, Vol 15, Issue 24
>Date: Sun, 24 Jul 2005 09:00:58 -0400
>
>Jerry is dead on with the method used by the military AUTODIN circuits.
>NCNC marks the beginning of the message and NNNN the end.  I've generated
>and received a lot of these messages over my career.  I don't know about 
>the
>other methods, but I imagine you guys know what you're talking about too.
>Catch ya on the air waves!
>73,
>Cam Hedrick
>WA4JKW
>
>-----Original Message-----
>From: collins-bounces+walnutcreek=appstate.net at mailman.qth.net
>[mailto:collins-bounces+walnutcreek=appstate.net at mailman.qth.net] On Behalf
>Of collins-request at mailman.qth.net
>Sent: Sunday, July 24, 2005 4:02 AM
>To: collins at mailman.qth.net
>Subject: Collins Digest, Vol 15, Issue 24
>
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>Today's Topics:
>
>    1. NNNN (Robert Lawson)
>    2. Re: NNNN (Gerald)
>    3. Re: NNNN (Jim Miller)
>
>
>----------------------------------------------------------------------
>
>Message: 1
>Date: Sat, 23 Jul 2005 21:04:17 -0700
>From: Robert Lawson <w4rl at bellsouth.net>
>Subject: [Collins] NNNN
>To: Collins at mailman.qth.net, amradio at mailman.qth.net
>Message-ID: <42E31341.7070802 at bellsouth.net>
>Content-Type: text/plain; charset=us-ascii; format=flowed
>
>Fellows,
>
>Where does the text "NNNN" originate (radio history) in text messages
>below the "signature" line? I see NNNN used sometimes, depending on the
>particular NWS forecaster, with the National Weather Service text
>messages about active tropical storms/hurricanes (which I might add,
>seem to be frequenting my area lately HI).  Also there is sometimes the
>"$$" being used along with the "NNNN"
>
>Just wondering.
>
>Regards,
>
>Robert WPE4FGR W4RL Pensacola Florida
>
>
>------------------------------
>
>Message: 2
>Date: Sat, 23 Jul 2005 20:52:22 -0500
>From: Gerald <geraldj at ispwest.com>
>Subject: Re: [Collins] NNNN
>To: collins at mailman.qth.net
>Message-ID: <1122169942.4792.3.camel at localhost>
>Content-Type: text/plain
>
>On Sat, 2005-07-23 at 21:04 -0700, Robert Lawson wrote:
> > Fellows,
> >
> > Where does the text "NNNN" originate (radio history) in text messages
> > below the "signature" line? I see NNNN used sometimes, depending on the
> > particular NWS forecaster, with the National Weather Service text
> > messages about active tropical storms/hurricanes (which I might add,
> > seem to be frequenting my area lately HI).  Also there is sometimes the
> > "$$" being used along with the "NNNN"
> >
> > Just wondering.
> >
> > Regards,
> >
> > Robert WPE4FGR W4RL Pensacola Florida
>NNNN is an old wire line expression for end of message, a lot like 30
>from telegraphy.
>
>If the NWS followed their own rules, they would only use $$ to separate
>parts of a forecast or report, but sometimes they put it at the end
>also.
>
>NCNC should mark the beginning of a message ended with NNNN if I
>remember correctly. I put recognizing those in my software so long ago
>I've forgotten the rest of the details.
>--
>73, Jerry, K0CQ, Technical Advisor to the CRA
>All content copyright Dr. Gerald N. Johnson, electrical engineer
>
>
>
>------------------------------
>
>Message: 3
>Date: Sat, 23 Jul 2005 23:13:54 -0400
>From: "Jim Miller" <jmiller1706 at cfl.rr.com>
>Subject: Re: [Collins] NNNN
>To: <collins at mailman.qth.net>
>Message-ID: <000a01c58ffd$b9298110$edf02141 at your9efcb93c24>
>Content-Type: text/plain; format=flowed; charset="iso-8859-1";
>	reply-type=original
>
>http://www.nadcomm.com/ascii_code.htm
>NNNN (4 N's) was also an International signal that disconnected the call 
>and
>
>turned off the radios used to convey the message in International radio
>message traffic. This is (or was) necessary with RCA, ITT, WUI, MacKay 
>Radio
>
>to ships at sea, etc..
>
>NNNN: the international standard EOM indicator.
>LLLL: an EOM signal used on FAA circuits.
>
>ZCZC: the international standard SOM indicator. An SOM may not have been
>sent or was unrecognizable when received.
>
>
>
>----- Original Message -----
>From: "Gerald" <geraldj at ispwest.com>
>To: <collins at mailman.qth.net>
>Sent: Saturday, July 23, 2005 9:52 PM
>Subject: Re: [Collins] NNNN
>
>
> > On Sat, 2005-07-23 at 21:04 -0700, Robert Lawson wrote:
> >> Fellows,
> >>
> >> Where does the text "NNNN" originate (radio history) in text messages
> >> below the "signature" line? I see NNNN used sometimes, depending on the
> >> particular NWS forecaster, with the National Weather Service text
> >> messages about active tropical storms/hurricanes (which I might add,
> >> seem to be frequenting my area lately HI).  Also there is sometimes the
> >> "$$" being used along with the "NNNN"
> >>
> >> Just wondering.
> >>
> >> Regards,
> >>
> >> Robert WPE4FGR W4RL Pensacola Florida
> > NNNN is an old wire line expression for end of message, a lot like 30
> > from telegraphy.
> >
> > If the NWS followed their own rules, they would only use $$ to separate
> > parts of a forecast or report, but sometimes they put it at the end
> > also.
> >
> > NCNC should mark the beginning of a message ended with NNNN if I
> > remember correctly. I put recognizing those in my software so long ago
> > I've forgotten the rest of the details.
> > --
> > 73, Jerry, K0CQ, Technical Advisor to the CRA
> > All content copyright Dr. Gerald N. Johnson, electrical engineer
> >
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