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Re: LF: Canada's newest amateur band - 630m. (B/W)

To: <[email protected]>
Subject: Re: LF: Canada's newest amateur band - 630m. (B/W)
From: "Graham" <[email protected]>
Date: Wed, 7 May 2014 22:59:54 +0100
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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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