[RTTY] (Some) digital modes now allowed on 60m

[Don Hill AA5AU]

I'm guessing 23hz RTTY would be allowed? 


73, Don AA5AU
http://www.aa5au.com
http://www.rttycontesting.com 

-----Original Message-----
From: rtty-bounces at contesting.com [mailto:rtty-bounces at contesting.com] On Behalf Of Kok Chen
Sent: Sunday, November 20, 2011 2:27 PM
To: RTTY Reflector
Subject: [RTTY] (Some) digital modes now allowed on 60m

FCC 11-171 was adopted on Nov 16, 2011:

http://transition.fcc.gov/Daily_Releases/Daily_Business/2011/db1118/FCC-11-171A1.pdf

Paragraph 25 of Section II ("Background") says:

> "25.	Decision. We adopt our proposal to authorize the use of three additional emission designators in the 60 meter band. These
additional capabilities can serve to enhance amateur emergency communications and allow for greater experimentation in the band, and
we believe that doing so is in the public interest. We note, however, that because "emission J2B" is specifically defined in Part 97
of our Rules to be a Radio Teletype (RTTY) emission, emission designator 60H0J2B must be codified as a RTTY emission in order to
provide for consistency within Part 97 of our Rules.44	Accordingly, we authorize control operators to transmit the following
additional emission types and designators in the
> 60 meter band: CW emissions, limited to emission 150HA1A (i.e., Morse code telegraphy); data emissions, limited to emission
2K80J3E (exemplified by PACTOR-III); and RTTY emissions, limited to emission 60H0J2D (exemplified by PSK31)."

Before you rush out and start calling CQ using steam RTTY, note however that the "RTTY" emission specifically mentions 60H0J2 which
is 60.0 Hz wide and thus restricted to PSK31 among today's commonly used modes (I think 22.73 baud Minimal Shift Keying is also
allowed).  

Until the ARRL comes up with further clarification, it does not appear to me like 170 Hz shift Baudot RTTY is permitted.  

As explained in the quoted paragraph above, the word "RTTY" is mentioned only because J2B has historically been called radioteletype
("RTTY").  The key is the "60H0" part of the emission designator.  The "RTTY" signal must fit inside 60 Hz, which 170 Hz shift RTTY
does not.

If you are curious about emission designators, see here http://www.comsearch.com/articles/emission.pdf .

Within the document, the FCC has alternated between 60H0J2B and 60H0J2D.  Breaking down 60H0J2B, 60H0 means 60.0 Hz, J is SSB
suppressed carrier, 2 means quantized (digital) information, and the ending B means machine reception (as opposed to aural
reception) of telegraphy.  An ending D, means that it is meant for data.  

73
Chen, W7AY



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