View all text of Subpart I [§ 90.201 - § 90.223]
§ 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 | ±25.0 kHz | 5.0 ms | 10.0 ms | t | ±12.5 kHz | 20.0 ms | 25.0 ms | t | ±25.0 kHz | 5.0 ms | 10.0 ms | Transient Frequency Behavior for Equipment Designed to Operate on 12.5 kHz Channels | t | ±12.5 kHz | 5.0 ms | 10.0 ms | t | ±6.25 kHz | 20.0 ms | 25.0 ms | t | ±12.5 kHz | 5.0 ms | 10.0 ms | Transient Frequency Behavior for Equipment Designed to Operate on 6.25 kHz Channels | t | ±6.25 kHz | 5.0 ms | 10.0 ms | t | ±3.125 kHz | 20.0 ms | 25.0 ms | t | ±6.25 kHz | 5.0 ms | 10.0 ms |
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1
t
t
t
t
2 During the time from the end of t
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.