MADness.
Guess we'd better build our rockbound rigs.
On Thu, 15 May 2003, Jim FitzSimons wrote:
> 31. We believe that frequencies in the 5250-5400 kHz range may be useful for
> completing disaster communications links at times when the 3 and 7 MHz bands
> are not available due to ionospheric conditions, and appreciate the desire
> of the amateur radio community to assist with disaster communications. At
> the same time, since the majority of the affected users are Federal
> Government licensees with homeland security responsibilities, we give
> considerable weight to the concerns NTIA has expressed about the potential
> for interference to these users. Thus, we conclude that it is not
> reasonable to grant ARRL's original request for the whole of the 5250-5400
> kHz band. However, as indicated above, NTIA has reviewed its assignments
> and has found that 5 channels are lightly used and could be used on a
> secondary basis by amateur stations. While we recognize that these five
> channels will not give the amateur service the 150 kilohertz of spectrum in
> the 5000 kHz range it originally asked for or the flexibility to use
> multiple transmission modes, this appears to be the best compromise
> available to give the amateur service access to new spectrum while assuring
> the Federal Government agencies that their use is protected. We also concur
> with NTIA's basic proposals that amateur service operations on these
> channels be limited to SSB-SC modulation, upper sideband voice transmissions
> only, with power not to exceed equivalent of 50 W PEP transmitter output
> power into an antenna with a gain of 0 dBd, or 50 W e.r.p. These operating
> rules will decrease the interference potential between amateur stations and
> Federal Government users. Accordingly, we are amending sections 2.106, and
> 97.303 of our rules to provide a secondary allocation to the amateur service
> on the channels 5332 kHz, 5348 kHz, 5368 kHz, 5373 kHz and 5405 kHz as
> specified by NTIA, and to require that amateur operations be limited to an
> effective radiated power (e.r.p.) of 50 W, and emission type 2K8J3E, upper
> sideband voice transmissions only centered on each frequency. For the
> purpose of computing e.r.p. the transmitter peak envelope power will be
> multiplied with the antenna gain relative to a dipole or the equivalent
> calculation in decibels. A half wave dipole antenna will be presumed to
> have a gain of 0 dBd. Licensees using other antennas must maintain in their
> station records either manufacturer data on the antenna gain or calculations
> of the antenna gain. In addition, because we are permitting amateur
> stations to transmit on 5 discrete frequencies and limiting the transmission
> mode to single sideband only, dividing the band into smaller sub-bands to be
> used for other emission types is not practical or necessary. Lastly, we
> will permit these frequencies to be used by amateur service licensees with a
> General Class, Advanced Class, or Amateur Extra Class operator license. We
> believe that the limited number of frequencies and the emission restriction
> will protect against interference to primary service operations.
>
>
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>
--
Scott Rosenfeld ARS N7JI
541-684-9970 Eugene, OR Land o' much rain
If you find me on the air, I'm probably in my car
ham@w3eax.umd.edu http://w3eax.umd.edu/~ham
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