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. 2 During 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. 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]