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 !
)
