Sec.  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  Sec. 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]