With our regulation emissions outsite a band must be a minimum of 40db down
and bandwith must be limited to 2,7KHz.
That means that less then 75mW above 14350KHz are just acceptable.
To obtain that one needs to transmit not higher in frequency then 14347 USB
and needs a pretty clean signal
73
Peter
-----Original Message-----
From: cq-contest-bounces@contesting.com
[mailto:cq-contest-bounces@contesting.com] On Behalf Of Michael Keane K1MK
Sent: Samstag, 3. November 2007 16:06
To: cq-contest@contesting.com
Cc: Paul Cassel
Subject: Re: [CQ-Contest] Band edge operating - Previously "More CQWW SSB
spot analysis"
At 09:27 PM 11/2/2007, Paul Cassel wrote:
>You will note that in the IARU bandplan, the top end of the 20 metre
>band is as everyone agrees 14350,
In this case, 14350 kHz is not just a good idea (or agreement), it's the
law. :-) Law that is binding upon signatories (countries) via treaty
obligation.
>however also note it shows an authorized maximum bandwidth of 2700 Hz.
>So interpretation by each country and regulator becomes an objective
>one.
The principle originates in Article 4 of the Radio Regulations of the
International Telecommunication Union: "4.5 - The frequency assigned to a
station of a given service shall be separated from the limits of the band
allocated to this service in such a way that, taking account of the
frequency band assigned to a station, no harmful interference is caused to
services to which frequency bands immediately adjoining are allocated."
I'll agree that exactly what constitutes harmful interference to services on
the frequencies immediately adjoining frequencies allocated to the amateur
radio service is subject to interpretation.
While I could see merit in arguments for operating as close as 2.1 kHZ, 2.7
kHz, 3.0 kHz, etc. from the band edge, operating on a frequency that places
most or all of one's transmitted signal outside the amateur allocation is
going too far and is objectively wrong.
All amateurs radio operators have the responsibility of ensuring that their
transmitted signal is contained within frequencies allocated to the amateur
radio service.
>I expect only the US FCC Part 97 is worded to specifically limit any
>modulation content to be within the band edges??
From a very cursory search, similar language does also appear in the
Australian and South African rules.
That the transmissions from stations operating in the amateur service must
be confined to the frequencies allocated to the amateur radio service may be
a point that some administrations feel is simply too obvious to have to
state explicitly in their rules.
73,
Mike K1MK
Michael Keane K1MK
k1mk@alum.mit.edu
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