The way our modem is set up, we're using 2*Rb bandwidth (not to mention
guard bands and things like that). So for 115 kbit/s, the FSK in our repo
is using 230KHz. We're also not going through an analog FM demod, so a 9600
packet radio port probably won't be up to the task anyway. The FMFSK modem
used for 2400B would probably be better there.
On Sun, Mar 12, 2017 at 1:12 AM, Stuart Longland <[email protected]
> wrote:
> On 28/02/17 11:24, David Rowe wrote:
> > We have managed to send HD images over 100km paths using just 50mW:
> >
> > http://www.rowetel.com/?p=5344
>
> Quoting the site:
> > We were receiving 115 kbit/s data on just 50mW of tx power at ranges of
> over 100km.
>
> Okay, silly question, how wide, approximately, was the transmitted
> signal? 115kbps is bloody good for 70cm FSK, giving D-Star 23cm digital
> data (which runs at 128kbps) a run for its money!
>
> I suspect it is wider than the standard 25kHz FM channel, hence the need
> for a "specialised" dongle (okay, bog standard digital TV receiver
> dongle based around the infamous Realtek chipset).
>
> It might be that the discriminator output available via the 9600 baud
> packet radio jacks isn't up to the task… but even ¼ of this data rate
> would be a brilliant alternative to the Bell-203 modulation we're used to.
>
> Regards,
> --
> Stuart Longland (aka Redhatter, VK4MSL)
>
> I haven't lost my mind...
> ...it's backed up on a tape somewhere.
>
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