It seems rather strange that when this allocation is still at least 6
months away for most of us (DL excepted) we are already talking about
where to fit in a specialised data mode... I expect there will be
significant interest in the band, when it arrives, and will attract far
greater interest in the general community than has 136. As such any
bandplanning should follow the practice on the higher bands - with CW
at
the bottom, then a small data slot, then SSB (is there enough room
for
that?...). It may even be sensible to split it 50/50, with cw in
the bottom
3.5kHz and all modes (including data) in the top half.
Whatever, if Opera
(the data mode) is going to be the default mode on
this band you are
unlikely to see me anywhere near it. And Opera (the
browser) released a new
version yesterday at exactly the same time as
the original message in this
thread was posted...
73 Dave G3YMC
On 15 Jun 2012 at 13:13, Mike
Dennison wrote:
> I agree there should be thought given to
bandplanning. Where, for
> instance, should I set my QRSS
receiver?
>
> However, the band is 7kHz wide and the suggestion to
"go 1k up may be ,
> 473 dial to give room for cw etc" would in fact give
just 2.2kHz of the
> band for what will presumably be the most popular
mode. Currently the
> two modes of the 500kHz version of Opera occupies
from 1.2kHz to 1.8kHz
> above dial frequency.
>
> I think we
need first to look at how much each mode might occupy. A
> useful division
might be 3.8kHz for CW, 0.2Hz for QRSS (perhaps in two
> wide-spaced
sub-bands) and 3kHz for all "data" (machine-read modes
> including Opera).
There is an argument that any mode involving beacons
> (including some
uses of QRSS and Opera) should be widely separated from
> two-way
QSOs.
>
> Lower bandwidth modes should be nearer the band edge.
Perhaps 'DX' modes
> should avoid the active NDB frequencies - say between
476 and 478kHz.
>
> Currently, it seems that Opera had a dial
frequency of 500kHz, and the
> 1.2kHz below it has some QRSS activity (eg
IQ2MI). That sort of
> arrangement may work on 472kHz provided the Opera
allocaton does not
> eventually migrate as it did on 137kHz.
>
> Perhaps in the short term there should be allocated (or at least
> agreed) frequencies with an understanding by all that there will need
to
> be adjustments eventually.
>
> All food for
thought.
> Mike, G3XDV
> ===========
>
http://www.davesergeant.com
