Its one of those loaded questions Joe ,
You have narrow modes with high energy / Hz b/w or wide modes
with low energy / Hz b/w ,
Which actually produces the most qrm to other users ?
true , there is not too much to be gained in terms of 'spreading
gain' at mf as the band parameters are 'uniform' but on the other
side , widening allows multiple access to the same b/w , but that
needs the level of coding to achieve this to be state of the art
Take say Olivia 2 K , that provides a below the noise level data
link , but in the traditional 1X3 format , 1 qso 1 mode 1 channel
.... where as ROS-HF 2KHz with a cdma layer in the code , allows
multiple qso's on the same channel, with a lower power , for the same
data rate , the Ros modem utilises a phase continuous wave , where
as Olivia has a phase angle content and needs a linear Tx system
There is nothing wrong with either system , but one offers a higher
level of access / users than the other
b/w and software architecture should be a design choice and not
obstacles !
73-G,
--------------------------------------------------
From: <[email protected]>
Sent: Tuesday, May 06, 2014 12:55 PM
To: <[email protected]>
Subject: Re: LF: Canada's newest amateur band - 630m. (B/W)
Hi G..
Yesterday, VE3QN at RAC had suggeted 1 kHz as a "fair guess" for B/W. Is
the Group comfortable with this?
Cheers
Joe VO1NA
On Sun, 4 May 2014, Graham wrote:
Better late than never Joe, just in time for the next dip in
solar activity as well !
No mention of modes and B/W in the sub clauses , other than the
usual 'no jam' ?
73, G,
--------------------------------------------------
From: <[email protected]>
Sent: Sunday, May 04, 2014 10:11 AM
To: <[email protected]>
Subject: LF: Canada's newest amateur band - 630m.
Hello Group,
For those who didn't get the CW message on 477.7 kHz last night, I'm
happy to report that 472-479 kHz is now available to all Canadian
amateurs. Per the ITU WRC12 approval of 14 February 2012, we may
use 5 watts EIRP on the band but may not cause interference to
the primary users. For further info, please see the Industry Canada
web page, http://www.ic.gc.ca/eic/site/smt-gst.nsf/eng/sf10759.html
which was published online last Thursday 1 May.
73
Joe VO1NA
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