§  90.214   Transient frequency behavior.

   Transmitters designed to operate in the 150-174 MHz and 421-512 MHz
   frequency bands must maintain transient frequencies within the maximum
   frequency difference limits during the time intervals indicated:
   Time intervals^1,2 Maximum
   frequency
   difference^3 All equipment
   150 to 174 MHz 421 to 512 MHz
   Transient Frequency Behavior for Equipment Designed to Operate on 25
   kHz Channels
   t[1]^4 +-25.0 kHz 5.0 ms 10.0 ms
   t[2] +-12.5 kHz 20.0 ms 25.0 ms
   t[3]^4 +-25.0 kHz 5.0 ms 10.0 ms
   Transient Frequency Behavior for Equipment Designed to Operate on 12.5
   kHz Channels
   t[1]^4 +-12.5 kHz 5.0 ms 10.0 ms
   t[2] +-6.25 kHz 20.0 ms 25.0 ms
   t[3]^4 +-12.5 kHz 5.0 ms 10.0 ms
   Transient Frequency Behavior for Equipment Designed to Operate on 6.25
   kHz Channels
   t[1]^4 +-6.25 kHz 5.0 ms 10.0 ms
   t[2] +-3.125 kHz 20.0 ms 25.0 ms
   t[3]^4 +-6.25 kHz 5.0 ms 10.0 ms

   ^1[on]is the instant when a 1 kHz test signal is completely suppressed,
   including any capture time due to phasing.

   t[1]is the time period immediately following t[on].

   t[2]is the time period immediately following t[1].

   t[3]is the time period from the instant when the transmitter is turned
   off until t[off].

   t[off]is the instant when the 1 kHz test signal starts to rise.

   ^2During the time from the end of t[2]to the beginning of t[3], the
   frequency difference must not exceed the limits specified in § 90.213.

   ^3Difference between the actual transmitter frequency and the assigned
   transmitter frequency.

   ^4If the transmitter carrier output power rating is 6 watts or less,
   the frequency difference during this time period may exceed the maximum
   frequency difference for this time period.

   [ 62 FR 2040 , Jan. 15, 1997]