Ok Many thanks' for the
reply's
From that .... next is :-
From the data, I assume that
100 Hz is the common limiting factor for a
narrow band data transmission that could be used
by all who 'wanted' to use it ?..(noted on
the cw keying speed ~ BW)
So if a value of 100 Hz is
specified, what is the 'presumed' roll-off of the power
in the said bands ?, assuming that the original
concept was based on CW operation , which by definition 'has to'
generate sidebands , there must be an assumed tolerance
?
Q would the deployment of a
system that could defined as 125 hz
bandwidth ie 100 Hz with +/- 12.5 Hz
overspill , cause a technical breach of the
regulations or be viewed as occupying
the 'allocated' bandwidth for a telegraphy transmission
? ,
Taking that spectral measurements in
the 10 Hz region are perhaps starting
to test even the best equipment, the
area is perhaps a little empiric ?
I use the word telegraphy,
purposely to view/observe the situation interims of the
licence conditions and not on the basis of
'mode' which like Liverpool and Everton have there own
sub cultures but are still football teams
..
Thanks
Graham
G0NBD
Sent: Wednesday, May 05, 2010 10:39 PM
Subject: LF: 500 Permit emission’s bandwidth? EU and Global
??
500 Permit
emission’s bandwidth?
Can any
one indicated what is the permitted
‘telegraphy’ bandwidth
of the various ‘new’ 500KHz licences
or special permits issued
round the EU and now the rest of
the Globe ?
I have the
impression that 100 Hz is the maximum ‘telegraphy’ transmission bandwidth,
in some cases, eg , Belgium at 100 Hz . Others appear to be some what
wider or not defined ?.
Norway is CW only ? what is the
Dutch allocation ? Southern Ireland ? ... etc
Are Beacons defined by
mode or bandwidth
?
Tnx –
Graham
G0NBD
(I use
the word ‘telegraphy’ as defined by
the ITU R V.662-3 , please
no reference to key clicks !
)
