Linux-Hams archive - November 1998: Re: Fw: 10 M packet freqs for 1200 baud.

Re: Fw: 10 M packet freqs for 1200 baud.

Bob Nielsen (terhi.victor@logonet.com)
Thu, 5 Nov 1998 20:41:24 -0700 (MST)

In the U.S., 10 meter data emissions (which include packet) are only
authorized from 28.0 - 28.3 MHz, with a symbol rate not exceeding 1200
baud and a frequency shift not exceeding 1 kHz. Undistorted AFSK with SSB
is equivalent to FSK, so this requirement is met. FM is considered a
phone emission (NBFM is allowed between 28.3 and 29.7 MHz and FM having a
modulation index greater than 1 is only allowed between 29.0 - 29.7 MHz),
but data is not allowed in this sub-band, hence FM AFSK packet is not
allowed in the U.S.

In the lower frequency bands, 300 baud is the maximum symbol rate allowed.

Bob

On Fri, 6 Nov 1998, Richard Adams wrote:

> According to Tomi Manninen: While burning my CPU.
> >
> > On Thu, 5 Nov 1998, KG7FU wrote:
> >
> > > >Generally, it's 300baud at 28.100 - 28.110ish.
> > > >
> > > >I've never heard a peep at 1200 baud and have been doing HF packet for over
> > > >10 years!
>
> Then your receiver is "if i may say so" not on the right place at the correct
> time, as i have qsl cards to prove qso's, expanding from 6 years ago.
>
> >
> > In Europe there are a lot of active stations at 29.250MHz running 1200bd
> > FM packet.
> >
> > Also at least a couple of years ago there was a _tcpip_ activity frequency
> > at (if my memory serves) 28.185MHz 1200bd USB. 1200bd AFSK packet works
> > surpricingly well over SSB and I had several tcpip QSOs to the states from
> > here when I tested it.
>
> I want to set up a stn, for experimental perporses on 10 meters 1200 baud,
> i have the equipment, all i need is permission from our local club
> directive, (which is granted) and of course a "special licence" from our
> Post Office which is applied for, the experimental status of the server will
> be tcp-ip over ssb radio at 1200 baud, with bbs connections and a link to
> the dutch radio network for all world wide hams. The qrg will be defined by
> our Post Office.
>
> >
> > --
> > --... Tomi Manninen / fovcan@microcell.fi / OH2BNS @ OH2RBI.FIN.EU ...--
> >
>
>
> --
> Regards Richard.
> wvrixrw@szske.sk
>

----
Bob Nielsen Internet: terhi.victor@logonet.com
Tucson, AZ AMPRnet: dleof.rjarod@mailit.tunk.net
DM42nh http://www.primenet.com/~nielsen