Subj : Re: packet radio
To   : dotslash
From : Vk3jed
Date : Thu Sep 01 2022 09:04 pm

-=> On 08-30-22 08:31, dotslash wrote to All <=-

 do> On 29/08/2022 18:00, Vk3jed wrote:
 > -=> On 08-27-22 10:13, dotslash wrote to All <=-
 >
 > Yeah they're turning up everywhere. :)  Wonder if some importer will ever
et
 > one type approved for UHF CB, they cartainly have the capabilities to run
 > there. :)

 do> I forgot that you have UHF CB in Oz. That is actually so cool! It would
 do> have been excellent if we could harmonize the used spectrum over the
 do> world, but 400-500 MHz is a busy place. Here in the UK 476-477 MHz (AU
 do> CB) is used for maritime radio, so no chance for us chewing off that
 do> spectrum for public use.

Yeah would be nice, but as you say, not gonna happen.

 do> The closest we have would be PMR446, but the bandwidth is very narrow
 do> between 446.0-446.2 MHz for narrow-band FM use. This include analog (16
 do> channels only) and digital (32 channels), both business (high powered

That spectrum is still a ham band here (and locally a well used ATV repeater).

 do> up to 5w) and private (max 500mw). You'll find baby monitors (illegal!)
 do> and blister-pack radio toys (possibly legal) also on this frequency
 do> range, so in cities this can be a cacophony. The only CB we have here
 do> is on 11-meters, which now at least have wide-band FM as a mode in
 do> addition to AM and SSB.

We don't have FM on 11m yet, but with the US adopting FM, it may become an
addition here one day.

 do> I hope you in Australia use that bandwidth for UHF CB for all it is
 do> worth, so that there is no chance of it being withdrawn from public
 do> use! Big business have been chipping away at the spectrum over here in
 do> Europe for decades now, so we don't have what we used to have even as
 do> recently as 10 years ago.

Oh, UHF CB is well used.  In fact, the ACMA increased the number of channels
from 40 to 80 in 2011 (by reducing spacing from 25 kHz to 12.5 kHz), to
increase the capacity of the service.


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