Kevin,
RTTY is data, but they often will use the term "data" to mean any other
digital mode including packet.
Data modes are not permitted on most HF SSB voice frequencies ... unless
the data is "image." The one exception is on 160 meters where it is
theoretically possible to do this although bandplans may not support
doing it.
Image in our voice frequencies is one of those things that happened due
to historical reasons. Since it was not possible to transmit the images
without using analog voice bandwidth, the image modes were placed in
the voice frequencies. I seem to recall that this was initially in the
Advanced Class voice frequencies. In more recent time, image was
permitted on any voice frequency.
By the same absurd logic, it was not considered data when sending data
that included images. Some felt that the FCC would never actually cite
anyone for sending images in the data mode frequencies but it really did
stop further experimentation. Some may remember when Peter, TY1PS
developed a neat Clover II program that would do this very thing when
you connected and that was maybe 20 years ago? I think it was called
Express and would display a thumbnail picture. He also sent the first
digitized music from Africa to the U.S. on the ham bands.
The data format, e.g., MFSK, PSK, FSK, does not necessarily reflect the
type of data being sent.
73,
Rick, KV9U
Kevin der Kinderen wrote:
>Be kind... sometimes I make the simplest things complicated. There are two
>questions here...
>
>I was working on bands.ini for MixW using the US Amateur Bands sheet from
>the ARRL. I have never noticed this before... are data (digital) modes not
>permitted in the SSB sub bands?
>
>For instance:
>7000 - 7150 = CW, RTTY and data (I thought RTTY was data)
>7150 - 7300 = CW, phone and image (no data modes allowed here?)
>
>I had been told in the past that it is not permitted for U.S. hams to
>transfer pictures using MFSK from 7000 - 7150 but it is permissable above
>7150. So MFSK is data or image or ... ya, content based regulation has me
>confused?
>
>Again, be kind. I pigeon hole my operations into the generally accepted sub
>bands and kind of lost track of what the regulations actually say or mean.
>
>73,
>Kevin - K4VD
>
>
>
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