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:


------------------------------------------------------------------------
                                                      All equipment
                                    Maximum    -------------------------
     Time intervals \1,2\          frequency     150 to 174   421 to 512
                                difference \3\      MHz          MHz
------------------------------------------------------------------------
Transient Frequency Behavior for Equipment Designed to Operate on 25 kHz
                                Channels
------------------------------------------------------------------------
t1 \4\........................   ±25.0    5.0 ms       10.0 ms
                                 kHz
t2............................   ±12.5    20.0 ms      25.0 ms
                                 kHz
t3 \4\........................   ±25.0    5.0 ms       10.0 ms
                                 kHz
------------------------------------------------------------------------
 Transient Frequency Behavior for Equipment Designed to Operate on 12.5
                              kHz Channels
------------------------------------------------------------------------
t1 \4\........................   ±12.5    5.0 ms       10.0 ms
                                 kHz
t2............................   ±6.25    20.0 ms      25.0 ms
                                 kHz
t3 \4\........................   ±12.5    5.0 ms       10.0 ms
                                 kHz
------------------------------------------------------------------------
 Transient Frequency Behavior for Equipment Designed to Operate on 6.25
                              kHz Channels
------------------------------------------------------------------------
t1 \4\........................   ±6.25    5.0 ms       10.0 ms
                                 kHz
t2............................   ±3.125   20.0 ms      25.0 ms
                                 kHz
t3 \4\........................   ±6.25    5.0 ms       10.0 ms
                                 kHz
------------------------------------------------------------------------
\1\on is the instant when a 1 kHz test signal is completely suppressed,
  including any capture time due to phasing.
t1 is the time period immediately following ton.
t2 is the time period immediately following t1.
t3 is the time period from the instant when the transmitter is turned
  off until toff.
toff is the instant when the 1 kHz test signal starts to rise.
\2\ During the time from the end of t2 to the beginning of t3, the
  frequency difference must not exceed the limits specified in  Sec. 
  90.213.
\3\ Difference between the actual transmitter frequency and the assigned
  transmitter frequency.
\4\ If 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]