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 ! )
