[SFDXA] (Some) Digital modes now allowed on 60m

[Kai Siwiak]

Chen is wrong.

The wording of the Report and Order seems to be exactly the same as how 
the FCC refers to digital modes elsewhere for HF. As near as I can tell, 
SSB, CW ham-RTTY, PSK31 and probably all other HF digital modes are OK 
as long as ALL of the emission is contained in the 2.8kHz bandwidth of 
the individual channels.

What the FCC identifies as RTTY they describe as PSK31. The FCC also use 
as ab example PACTOR-3 and give an emission necessary bandwdith example 
as 2K8 or 2.5 kHz, which is the entire bandwidth of a channel. That will 
certain;y fit ham-RTTY which has a "necessary bandwdith of just 250Hz 
according to the ITU-R.

I think there is no problem. We can use ANY digital mode that is 
permitted elsewhere in the regs below 28 MHz. We do have to contain ALL 
of the modulation within the 2800 Hz channel bandwidth.  There also 
seems to be no prohibition of split operation as long as both 
transmissions are entirely within the 2800 Hz channel bandwidth. Since 
ham-RTTY is less than 250 Hz bandwidth total, you could easily get two 
RTTY sigs a kHz apart inside one channel.

The FCC has done a great job of obfuscating the emission designators and 
common mode names (RTTY=PSK31???)  all over part 97, and now in the 
Report and Order. If you go by the ITU-R designation (to which the FCC 
and NTIA are parties) ham RTTY (170 Hz shift, 45.5 baud, two tone) is 
250HF2B. If you read the words of the R&O, any ham digital mode in use 
below 28 MHz seems to be permitted. Just keep it all confined to that 
2800 Hz channel. That is going to be a REAL challenge for hams!

73
Kai, KE4PT


Bill Marx wrote:
> So he is saying mechanical RTTY is ok but "aural" is not...
>
>
>
> On 11/20/2011 5:44 PM, Bill Marx wrote:
>   
>>    From the RTTY List:
>>
>>
>> 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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