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421-430 MHz Band


Contents

Overview

The 421-430 MHz band is available for public safety and business/industrial use in specific sub-bands carved from the 70 cm amateur radio/radiolocation spectrum allotment in the following North of Line A regions: Detroit, MI; Cleveland, OH; and Buffalo, NY. 47 C.F.R. 90.273, 90.275, 90.279, 90.281, and 90.619 (Table 7) define the operational boundaries and technical limitations of the spectrum.

Narrowbanding is required, with a maximum occupied voice bandwidth of 12.5 kHz (11K2F3E), or corresponding 9.6 kBps data throughput within a 12.5 kHz channelspace. 6.25 kHz interstitial channels are available for no-greater-than 6K00 emissions.

Operational Fixed (FXO) operations are not allowed (90.281(a)).

In general, in the areas where it is available, this allotment is loaded by legacy operations and new use of frequencies may require the concurrence of incumbent licensees.

Areas Authorized

  • Buffalo, NY (Reference coordinates 42-52-52 N/ 078-52-21 W)
  • Cleveland, OH (Reference coordinates 41-29-51 N/ 081-41-50 W)
  • Detroit, MI (Reference coordinates 42-19-48 N/ 083-02-57 W)

Base and control stations to Maximum ERP within 48 km (north of Line A)

Full power mobiles and <= 2W base stations within 80 km (north of Line A)

Higher power base stations may be authorized outside of the 48 km radius, but north of Line A, by waiver. Approval for a higher power level is not guaranteed.

All mobile operations must be contained to no further than the 80 km radius. This is not waiverable.

Channels Available

Detroit and Cleveland

113 paired channels 12.5 kHz wide business/industrial (422.2000 - 422.9875 MHz and 424.4000 - 424.9875 MHz)

111 paired channels 12.5 kHz wide public safety (423.0000 - 423.8000 MHz and 423.8250 - 424.3875 MHz)

20 single (unpaired) channels 12.5 kHz wide business/industrial (425.0000 - 425.2375 MHz)

19 single (unpaired) channels 12.5 kHz wide public safety (425.2500 - 425.4750 MHz)


Buffalo

48 paired channels 12.5 kHz wide business/industrial (424.4000 - 424.9875 MHz)

46 paired channels 12.5 kHz wide public safety (423.8250 - 424.3875 MHz)

20 single (unpaired) channels 12.5 kHz wide business/industrial (425.0000 - 425.2375 MHz)

19 single (unpaired) channels 12.5 kHz wide public safety (425.2500 - 425.4750 MHz)

Calculating Maximum ERP

Effective radiated power (ERP) is limited based on prior arrangements between the United States and Canada. Use of this spectrum requires the calculation and compliance within what is termed the Effective Antenna Height (EAH) limitations. Failure to do so will result in the return of the application without further action.

EAH is derived by adding the antenna height to tip and the ground elevation above mean sea level. The sum is then subtracted from the Assumed Average Terrain Elevation (AATE) which is derived from 90.619 (Table 7). The result is then applied to the chart in 90.279(a).

With respect to the data on an FCC Form 601:

  (Schedule H item 23)
+ (Schedule D item 13)
- (Relevant AATE value from 90.619 Table 7)
= (Value applied to left column in chart in 90.279(a))
= (Corresponding Max ERP in right column)

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