There is nothing in the requirement that one actually *copy* USB. One
must avoid interference but that cuts both ways ... USB users (other
than the authorized agencies) are not permitted to interfere with CW
or digital users any more than CW/digital operators are permitted to
interfere with USB users.
"Center channel tuning" permits CW and FSK users to recognize the
presence of other users on the channel and avoid causing interference.
To argue that one must actually be able to clearly copy USB is the
same "head where the sun don't shine" stupidity that would limit CW
users to *tone modulated CW*.
AFSK is the RTTY mode for technological novices ... those who do not
know how to operate their transceivers in the way the manufacturer
designed them to operate. In the hands of the majority of operators,
AFSK is simply another means to "The Old Man's" Rotten Signals ... full
of improper shift (not fixed at 170Hz), "clicks" due to changing tones
in a non-phase continuous/zero crossing, QSOs tracking up/down the band
as one stations AFC chases the other, etc.
73,
... Joe, W4TV
On 3/29/2012 6:53 PM, Gary AL9A wrote:
>> From the comments made by Kai regarding RTTY on 60M...
>
> The requirement that, "...the radio should be configured so that an upper
> SSB signal can be copied in case they need to tell you the channel is
> occupied. " precludes the use of FSK. To comply with this FCC/NTIA
> requirement AFSK would be the only RTTY mode that would allow you to monitor
> the frequency for a SSB message that the channel is occupied. If your radio
> has a data setting, such as USB-D1, this would be the preferred mode as it
> mutes the mike.
>
> 73,
> Gary AL9A
>
>
> ----- Original Message -----
> From: "Bill Turner"<dezrat1242@yahoo.com>
> To: "RTTYReflector"<rtty@contesting.com>
> Sent: March 29, 2012 9:21 AM
> Subject: [RTTY] Fw: ARLB006 NTIA: No Objection to Additional Data Modes on60
> Meters
>
>
> The NTIA (which has jurisdiction over the FCC) has removed restrictions on
> Baudot RTTY and all other digital modes on the 60 meter band. Below is the
> message from ARRL.
>
> Please be careful about centering your RTTY signal in the channel.
> Especially, be sure what your shift is. Every now and then I see stations
> using 200 Hz shift instead of the standard 170 Hz. I suspect most of them
> are using AEA TNCs which for some reason used 200 Hz as their default.
> Remember, whether using FSK or AFSK, your MARK signal is the higher RF
> frequency and SPACE is the lower, so do the centering accordingly. With FSK
> it's pretty straightforward but AFSK can be a little trickier.
>
> Hope to see you on the air as soon as my rig gets back from the radio
> hospital.
>
>
> 73, Bill W6WRT
>
>
>
> ----- Forwarded Message -----
>> From: ARRL Web site<memberlist@www.arrl.org>
>> To: dezrat1242@yahoo.com
>> Sent: Thursday, March 29, 2012 7:18 AM
>> Subject: ARLB006 NTIA: No Objection to Additional Data Modes on 60 Meters
>>
>> SB QST @ ARL $ARLB006
>> ARLB006 NTIA: No Objection to Additional Data Modes on 60 Meters
>>
>> ZCZC AG06
>> QST de W1AW
>> ARRL Bulletin 6 ARLB006
>> From ARRL Headquarters
>> Newington CT March 29, 2012
>> To all radio amateurs
>>
>> SB QST ARL ARLB006
>> ARLB006 NTIA: No Objection to Additional Data Modes on 60 Meters
>>
>> In response to requests for clarification from the ARRL, the
>> National Telecommunications and Information Administration (NTIA)
>> has confirmed that it has no objection to the use of a broader range
>> of data emissions by amateurs on the five 5 MHz frequencies on 60
>> meters. ARRL's original understanding was that the NTIA preferred
>> that the use of 2K80J2D emission be limited to Pactor III. The NTIA
>> now says that that is not the case.
>>
>> In an e-mail response to ARRL Chief Executive Officer David Sumner,
>> K1ZZ, Karl Nebbia, Associate Administrator of the NTIA Office of
>> Spectrum Management, stated, "NTIA has no interest in limiting the
>> types of emission used by the amateurs as long as the data emission
>> does not exceed the 2.8 kHz bandwidth generated by the upper
>> sideband transmitter." Nebbia referred all further inquiries to the
>> FCC, which "...sets the conditions for use of the five 5 MHz
>> frequencies by the amateurs."
>>
>> The requirement of only one signal per channel remains, as well as
>> the prohibition against automatic operation. The FCC continues to
>> require that all digital transmissions be centered on the
>> channel-center frequencies, which the Report and Order defines as
>> being 1.5 kHz above the suppressed carrier frequency of a
>> transceiver operated in the Upper Sideband (USB) mode. This is
>> typically the frequency shown on the frequency display.
>>
>> Channel USB Suppressed Carrier (kHz) Center (kHz)
>>
>> 1 5330.5 5332.0
>>
>> 2 5346.5 5348.0
>>
>> 3 5357.0 5358.5
>>
>> 4 5371.5 5373.0
>>
>> 5 5403.5 5405.0
>>
>> The ARRL advises amateurs to operate with care when using digital
>> modes in consideration of the fact that hams are secondary users on
>> these frequencies. See the revised 60-Meter FAQ page on the ARRL Web
>> at, http://www.arrl.org/60-meter-faq.
>>
>> The revised ARRL 60-Meter Recommended Practices document can also be
>> found in PDF form on the web at,
>> http://www.arrl.org/files/file/Regulatory/Recommended_Practices_Version_6_5.pdf.
>> NNNN
>> /EX
>>
>>
>>
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