[amsat-bb] [AMSAT-bb] ARIL Bandplans
g.shirville at btinternet.com
Sun Aug 31 13:59:00 UTC 2014
Originally this section of the 10 metre bandplan had a downlinks only
restriction but this has now been removed in IARU Bandplans. From memory,
Region 1 removed it at their Sun City Conference in 2011, Region 2 at their
Conference in Cancun in 2012 but I don't think it was ever shown in any
Region 3 documentation.
The original reason for it being there is unclear. It may have a been a fear
of possible CB interference or it may have been because AO7 only used 29MHz
for a downlink.
There often difference between the ITU allocations for the amateur satellite
service and frequencies shown in bandplans.
For instance the complete 10 metre band is allocated by the ITU for amateur
satellite operations but our IARU bandplans show just 29.300 29.510MHz.
Also, on 2 metres, the ITU allocation is 144-146MHz but by IARU agreement we
only use 145.800-146.00MHz plus the new section at 144.0025 -145.025MHz
which has already been agreed by IARU Regions 2 and 3 and will hopefully
also be agreed by Region 1 at their Conference in Bulgaria in three weeks
Of course there are occasions when member societies have local variations of
these regional bandplans but I would hope, in this case, it is simply an
From: g0mrf at aol.com
Sent: Sunday, August 31, 2014 10:47 AM
To: m5aka at yahoo.co.uk ; amsat-bb at amsat.org
Subject: Re: [amsat-bb] ARRL Bandplans
BTW does anyone know why ARRL thinks 29.3-29.510 is Downlink only ? and I
haven't a clue what exactly they mean by using "(internationally)" for 70cm.
73 Trevor M5AKA
I went off and looked at the UK allocations when I read that. Seems to be
up or down and not limited to 29.3 either.
But, I did notice that 10.475 GHz to 10.500 GHz is allocated to the amateur
satellite service, but not to amateurs in general. i.e. no terrestrial
use. - That's a first !! We've got our own piece of spectrum.
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