[1000mp] Re: ARRL testing of Clicks

[Bill Tippett]

SM2EKM wrote:
>PS: I know this is a worldwide problem but since FCC actually stipulates
what they do in their rules I use the USA hams in this example.

        When our fundamental signal is in the range of -30 dBm (range
of S9+ 40 to 50dB) on another's receiver, I submit that few, if any,=20
signals can meet this regulation:


=A797.307 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.=20

(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 frequencies.=20

(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.=20

(d) The mean power of any spurious emission from a station transmitter or
external RF power amplifier transmitting on a frequency below 30 MHz must
not exceed 50 mW and must be at least 40 dB below the mean power of the
fundamental emission. For a transmitter of mean power less than 5 W, the
attenuation must be at least 30 dB. A transmitter built before April 15,
1977, or first marketed before January 1, 1978, is exempt from this
requirement.=20

        Even if your signal met (d), spurs on a -30 dBm fundamental
would still be -70 dBm which is in the order of an S9+ signal, easily=20
failing (b).  Even if spurs were down the 60 dB we say is 'good', spurs=20
would still be at -90 dBm which is about 40-50 dB above the noise floor=20
of most receivers.  The only way (b) above could be met is to reduce power
substantially (at least 20-30 dB!).  Of course then we have to consider=20
this rule which few of us follow:

=A797.313 Transmitter power standards.
(a) An amateur station must use the minimum transmitter power necessary to
carry out the desired communications.=20

        Oh well...I don't drive 55 MPH either!  Happy 4th of July to all
as we celebrate our freedom from regulations!  ;-)

                                                73,  Bill  W4ZV