Topband: ARRL Board Requests Member Comments About Digital Modes

Henk PA5KT pa5kt at
Wed Mar 5 02:40:38 EST 2014


One of the problems with making band plans is that every region makes 
its own and then forget how things are arranged in other zones.
In EU still a lot of the countries have only 1830-1850 available.
To make everybody happy the bandplan has to allow CW, digital and phone 
in this 20kHz window.

Why not using the Region 1 plan as a base?
Up to 1838 CW.
1838-1840 CW and narrow band digital with <500Hz bandwidth
1840-1843 digital and other modes.
1843 and higher all modes.

Also it would be nice if everybody would use JT9. It is much more 
efficient, but it is rarely used. Most people stick to JT65.

73 Henk PA5KT

Mike Waters schreef op 3/3/2014 7:57 PM:
> Since there has been recent discussions on this reflector about JT65 on
> 1838, I thought I would pass this on.
> IMO, digital should go below 1810, AND it should preferably be a narrow
> band mode such as the superior JT9 mode.
> As W8JI recently pointed out, insufficient sideband suppression (and IMD
> products of improperly adjusted rigs) of JT65 signals --becoming more and
> more common on 1838-- winds up in the area where weak signal DX is common.
> Furthermore, Joe Taylor himself --the author of JT65 and JT9-- has stated
> in no uncertain terms that the JT9 mode is superior to the far wider JT65
> mode for MF and lower HF weak signal communications. JT65 is for EME and
> upper HF.
> I suggest that this be discussed here for a week or so before anyone
> submits comments to the ARRL.
> 73, Mike
> ---------- Forwarded message ----------

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