LF: Fw: [rsgb_lf_group] Re: New Opera QRG for 472 Khz Band ?

["mal hamilton" <g3kevmal@talktalk.net>]

I think some careful thought should go into the bandplanning to avoid a conflict of modes especially those that want to QSO as opposed to those unattended Beacon qrm generators in any mode. ie REPEATIVE CW, QRSS, OPERA and other data modes. 

also some countries might not get the full allocation and might need a different slot for their chosed mode.

 de G3KEV

 

----- Original Message -----

From: Mike Dennison

To: rsgb_lf_group@yahoogroups.co.uk

Sent: Friday, June 15, 2012 12:13 PM

Subject: Re: [rsgb_lf_group] Re: New Opera QRG for 472 Khz Band ?

 

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
===========

> Well , could set the lower band edge frequency , that fits in with
> using USB, puts signal 1.4Khz inside the band .. or do we need to go
> 1k up may be , 473 dial to give room for cw etc ?
>
> G.
>
> --- In rsgb_lf_group@yahoogroups.co.uk, Rik Strobbe <rik.strobbe@...>
> wrote: > > Either the upper or lower band end ? > > > > 73, Rik ON7YD
> - OR7T > > > > ________________________________ > Van:
> rsgb_lf_group@yahoogroups.co.uk [rsgb_lf_group@yahoogroups.co.uk]
> namens graham787 [g0nbd@...] > Verzonden: vrijdag 15 juni 2012 2:13 >
> Aan: rsgb_lf_group@yahoogroups.co.uk > Onderwerp: [rsgb_lf_group] New
> Opera QRG for 472 Khz Band ? > > > > New QRG for 472 Khz Band > >
> Suggestions needed for a QRG for the new 472 KHz band > Dial set USB
> frequency , taking into account other band users ! > > Tnx - G >
>
>
>

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