[Collins] NNNN

[Jim Miller]

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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