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 | |||
| t1 4 | ±25.0 kHz | 5.0 ms | 10.0 ms |
| t2 | ±12.5 kHz | 20.0 ms | 25.0 ms |
| t3 4 | ±25.0 kHz | 5.0 ms | 10.0 ms |
| Transient Frequency Behavior for Equipment Designed to Operate on 12.5 kHz Channels | |||
| t1 4 | ±12.5 kHz | 5.0 ms | 10.0 ms |
| t2 | ±6.25 kHz | 20.0 ms | 25.0 ms |
| t3 4 | ±12.5 kHz | 5.0 ms | 10.0 ms |
| Transient Frequency Behavior for Equipment Designed to Operate on 6.25 kHz Channels | |||
| t1 4 | ±6.25 kHz | 5.0 ms | 10.0 ms |
| t2 | ±3.125 kHz | 20.0 ms | 25.0 ms |
| t3 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. | |||
| 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 § 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]