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Re: [CQ-Contest] oo report

To: "Rick Dougherty NQ4I" <nq4i@contesting.com>,<cq-contest@contesting.com>
Subject: Re: [CQ-Contest] oo report
From: "Michael Tope" <W4EF@dellroy.com>
Date: Sat, 27 Mar 2004 15:51:04 -0800
List-post: <mailto:cq-contest@contesting.com>
----- Original Message -----
From: "Rick Dougherty NQ4I" <nq4i@contesting.com>

> Hello all...I received an OO report for operating on 14.150.41 mhz and he
> cited me for being out of the band...any legal types who can help me reply
> to this guy and set him straight?? I feel that freq is within my
> permissible
> limits...or am I wrong and need to apologize ?? de Rick nq4i


I would say that the OO is incorrect in this case. Its possible
that you had some IMD products that were falling below
14.150 MHz, but certainly your fundamental modulation
sidebands were up above 14.150 MHz (I am assuming of
course that your were running USB). Here is what part 97

S 97.307 Emission standards.

(a) No amateur station transmission shall occupy more
bandwidth than necessary for the information rate and
emission type being transmitted, in accordance with
good amateur practice.

(b) Emissions resulting from modulation must be confined
to the band or segment available to the control operator.
Emissions outside the necessary bandwidth must not cause
splatter or keyclick interference to operations on adjacent

(c) All spurious emissions from a station transmitter must
be reduced to the greatest extent practicable. If any spurious
emission, including chassis or power line radiation, causes
harmful interference to the reception of another radio station,
the licensee of the interfering amateur station is required to
take steps to eliminate the interference, in accordance with
good engineering practice.

Paragraph (b) suggests that you can't have IMD sidebands
falling out-of-band (in this case below 14.150 MHz), but they
don't really put a number on how low distortion needs to be
before you can ignore it (even a really clean transmitter will
have IMD sidebands that extend for many kilohertz above
and below the operating frequency, albeit at a very low level).

I would reply to the OO and ask what criteria he used to determine
that you were "out-of-band" and then ask him how far you would
need to move (or perhaps how clean your IMD would need to
be for you to be in compliance).

You can refer the OO to me if you like. I worked UP6P last night
at 14150.15 KHz, so if that is considered doing something
wrong, I would like to know about it (and why). BTW, what the
OO should have been doing last night was writing up all the people
up on 20 meter SSB who were 10 KHz wide (I heard some truly
atrocious audio last night).

73 de Mike, W4EF..........

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