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                            Before the
                Federal Communications Commission
                      Washington, D.C. 20554


In Re:                            )
                                  )
Amendment of the Commission's Rules to   )        ET Docket No. 97-99
Relocate the Digital Electronic Message Service   )
From the 18 GHz Band to the 24 GHz Band   )
and to Allocate the 24 GHz Band for Fixed   )
Service                           )


                                                               
                                                               
                            ERRATUM
                         
                    Released: July 31, 1998

By the Chief, International Bureau:

     1.   The above captioned item, FCC 98-155 released July 17, 1998, is corrected as
follows:

     2.    The word "diameter" should be changed to "radius" in the first and fifth line in
paragraph 48.  Thus, the paragraph should read:   

     "48. The typical DEMS cell has a radius of approximately 5 km.  Petitioners argue that
cell size can be varied to accommodate differences in performance and propagation, thus negating
the need for additional channel bandwidth.  However, to achieve the same service reliability and
system performance without increasing the bandwidth or power, a typical cell radius would have to
be reduced from 4.81 to 2.84 km.  Thus, moving the licensees to the 24 GHz band from the 18 GHz
band would require reducing the cell size by 2.8 times.  As a result, in order to maintain the same
service the DEMS licensees would need to increase significantly the number of cells to compensate
for the reduced cell size."

     3.   The word "diameter" should be changed to "radius" in the last sentence of footnote
90.  Thus, the footnote should read:

"This calculation is based on using the same user terminal antenna and power amplifier in order to
minimize the cost and time of the transition.  The antenna gain improvement at the higher band
exactly offsets the 2.3 dB higher free space loss increase; however, the power amplifier has
approximately 1 dB lower performance at 24 GHz.  Rain attenuation for a path reliability of 99.99%
results in an additional 9.5 dB of loss.  Thus 10.5 dB (9.5 rain attenuation plus 1.0 for lower power)
of performance would need to be overcome.  As a result, the average cell radius would have to be
reduced from 4.81 to 2.84 km to achieve the same data throughput.  See id."

     4.   The word "diameter" should be changed to "radius" in the 10th line of Appendix A,
Section A.  Thus, the paragraph should read:

"The 9.5 dB rain attenuation differential is based on a typical cell radius of around 4.8 km and a
service reliability of 99.99%.  The 1.0 dB of reduced transmitter power is a result of operating the
same power amplifier at the higher frequency.  However, 2.3 dB of additional spreading loss can be
counteracted by increasing antenna gain if the same antenna is used at the higher frequency band. 
This leaves a total of 10.5 dB which needs to be overcome.  Increasing the transmitter power by this
amount would overcome these additional losses, but would have required significant redesign of the
existing DEMS equipment.  Similarly, the DEMS cell size could be reduced, but that would
significantly increase the number of cells required and therefore the cost of DEMS.  Studies have
shown that this performance could be recovered by reducing a typical cell radius from 4.81 to 2.84
km.  This represents a reduction in area by a factor of 2.8, with a consequently similar increase in the
number of cells."



                              Federal Communications Commission




                              Regina M. Keeney         
                              Chief, International Bureau