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Date: Wed, 2 Nov 2011 23:16:29 +0000 (GMT)
From: M0FMT <m0fmt@yahoo.co.uk>
To: "rsgb_lf_group@blacksheep.org" <rsgb_lf_group@blacksheep.org>
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Subject: Re: LF: Re: 8kHz of spectrum
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Hi all=0A=0AIn my humble opinion high power only goes with wide band width =
because ground wave on these medium frequencies travels. So I welcome the l=
ower power suggestion (assuming anybody sticks to it) with the narrow band =
width proposal. And don't jump on me about front end selectivity=A0 because=
 I think it is insurmountable even by "Real" Amateurs.=0A=0A73 es GL Pete M=
0FMT IO91UX47VN=0A=0AFrom: James Moritz <james.moritz@btopenworld.com>=0ATo=
: rsgb_lf_group@blacksheep.org=0ASent: Wednesday, 2 November 2011, 22:58=0A=
Subject: LF: Re: 8kHz of spectrum=0A=0ADear LF Group,=0A=0AWell, I think th=
is is a positive development - the only minor disappointment is the reducti=
on in maximum ERP to about 3W.=0A=0AAs for the choice of frequency, the mar=
itime people have a plan for a sort of=A0 "super Navtex" using OFDM modulat=
ion with a bandwidth of 10kHz centred on 500kHz. It may be that this is jus=
t a pipe dream, and/or a way to justify continued primary user status at 50=
0kHz. But if it ever does come into existence, it will certainly be using v=
astly higher powers than amateur stations, and the noise sidebands will ext=
end well beyond the actual signal bandwidth due to "spectral re-growth" in =
the TX PA. So it will be good to have a significant difference in frequency=
 between ourselves and the noisy things. I expect all those REAL amateurs w=
ill manage to reduce their TX frequency by 5 percent somehow ;-)=0A=0ACheer=
s, Jim Moritz=0A73 de M0BMU 
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<html><body><div style=3D"color:#000; background-color:#fff; font-family:ar=
ial, helvetica, sans-serif;font-size:12pt"><div style=3D"RIGHT: auto">Hi al=
l<BR><BR>In my humble opinion high power only goes with wide band width bec=
ause ground wave on these medium frequencies travels. So I welcome the lowe=
r power suggestion (assuming anybody sticks to it) with the narrow band wid=
th proposal. And don't jump on me about front end selectivity&nbsp; because=
 I think it is insurmountable even by "Real" Amateurs.<BR><VAR id=3Dyui-ie-=
cursor></VAR><BR>73 es GL Pete M0FMT IO91UX47VN<BR><BR>From: James Moritz &=
lt;james.moritz@btopenworld.com&gt;<BR>To: rsgb_lf_group@blacksheep.org<BR>=
Sent: Wednesday, 2 November 2011, 22:58<BR>Subject: LF: Re: 8kHz of spectru=
m<BR><BR>Dear LF Group,<BR><BR>Well, I think this is a positive development=
 - the only minor disappointment is the reduction in maximum ERP to about 3=
W.<BR><BR>As for the choice of frequency, the maritime people have a plan
 for a sort of&nbsp; "super Navtex" using OFDM modulation with a bandwidth =
of 10kHz centred on 500kHz. It may be that this is just a pipe dream, and/o=
r a way to justify continued primary user status at 500kHz. But if it ever =
does come into existence, it will certainly be using vastly higher powers t=
han amateur stations, and the noise sidebands will extend well beyond the a=
ctual signal bandwidth due to "spectral re-growth" in the TX PA. So it will=
 be good to have a significant difference in frequency between ourselves an=
d the noisy things. I expect all those REAL amateurs will manage to reduce =
their TX frequency by 5 percent somehow ;-)<BR><BR style=3D"RIGHT: auto">Ch=
eers, Jim Moritz<BR>73 de M0BMU </div></div></body></html>
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