Sec.  22.970   Unacceptable interference to Part 90 non-cellular 800 MHz
licensees from cellular radiotelephone or Part 90 ESMR systems.

   

   (a) Definition. Except as provided in  47 FR 90 .617(k), unacceptable
   interference to non-cellular part 90 of this chapter licensees in the
   800 MHz band will be deemed to occur when the below conditions are
   met:

   (1) A transceiver at a site at which interference is encountered:

   (i) Is in good repair and operating condition, and is receiving:

   (A) A median desired signal of -104 dBm or higher, as measured at the
   R.F. input of the receiver of a mobile unit; or

   (B) A median desired signal of -101 dBm or higher, as measured at the
   R.F. input of the receiver of a portable i.e. hand-held unit; and,
   either

   (ii) Is a voice transceiver:

   (A) With manufacturer published performance specifications for the
   receiver section of the transceiver equal to, or exceeding, the
   minimum standards set out in paragraph (b) of this section, below;
   and;

   (B) Receiving an undesired signal or signals which cause the measured
   Carrier to Noise plus interference (C/(I+N)) ratio of the receiver
   section of said transceiver to be less than 20 dB, or,

   (iii) Is a non-voice transceiver receiving an undesired signal or
   signals which cause the measured bit error rate (BER) (or some
   comparable specification) of the receiver section of said transceiver
   to be more than the value reasonably designated by the manufacturer.

   (2) Provided, however, that if the receiver section of the mobile or
   portable voice transceiver does not conform to the standards set out
   in paragraph (b) of this section, then that transceiver shall be
   deemed subject to unacceptable interference only at sites where the
   median desired signal satisfies the applicable threshold measured
   signal power in paragraph (a)(1)(i) of this section after an upward
   adjustment to account for the difference in receiver section
   performance. The upward adjustment shall be equal to the increase in
   the desired signal required to restore the receiver section of the
   subject transceiver to the 20 dB C/(I+N) ratio of paragraph
   (a)(1)(ii)(B) of this section. The adjusted threshold levels shall
   then define the minimum measured signal power(s) in lieu of paragraphs
   (a)(1)(i) of this section at which the licensee using such
   non-compliant transceiver is entitled to interference protection.

   (b) Minimum receiver requirements. Voice transceivers capable of
   operating in the 806-824 MHz portion of the 800 MHz band shall have
   the following minimum performance specifications in order for the
   system in which such transceivers are used to claim entitlement to
   full protection against unacceptable interference (See paragraph (a)
   (2) of this section).

   (1) Voice units intended for mobile use: 75 dB intermodulation
   rejection ratio; 75 dB adjacent channel rejection ratio; -116 dBm
   reference sensitivity.

   (2) Voice units intended for portable use: 70 dB intermodulation
   rejection ratio; 70 dB adjacent channel rejection ratio; -116 dBm
   reference sensitivity.

   [ 69 FR 67834 , Nov. 22, 2004]