47 CFR 90.214 - Transient frequency behavior.

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§ 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 Maximumfrequency difference 3 All equipment
150 to 174 MHz 421 to 512 MHz
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.
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
[62 FR 2040, Jan. 15, 1997]

Title 47 published on 2013-10-01

The following are only the Rules published in the Federal Register after the published date of Title 47.

For a complete list of all Rules, Proposed Rules, and Notices view the Rulemaking tab.

  • 2014-10-28; vol. 79 # 208 - Tuesday, October 28, 2014
    1. 79 FR 64126 - Development of Operational, Technical and Spectrum Requirements for Meeting Federal, State and Local Public Safety Agency Communications Requirements Through the Year 2010
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      FEDERAL COMMUNICATIONS COMMISSION
      Final rule; announcement of effective date.
      The information collections in 47 CFR 90.525, 90.529, 90.531 published at 65 FR 66644, November 7, 2000 and 66 FR 10632, February 16, 2001, are effective October 28, 2014.
      47 CFR Part 90

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United States Code
Statutes at Large

Title 47 published on 2013-10-01

The following are ALL rules, proposed rules, and notices (chronologically) published in the Federal Register relating to 47 CFR 90 after this date.

  • 2014-10-28; vol. 79 # 208 - Tuesday, October 28, 2014
    1. 79 FR 64126 - Development of Operational, Technical and Spectrum Requirements for Meeting Federal, State and Local Public Safety Agency Communications Requirements Through the Year 2010
      GPO FDSys XML | Text
      FEDERAL COMMUNICATIONS COMMISSION
      Final rule; announcement of effective date.
      The information collections in 47 CFR 90.525, 90.529, 90.531 published at 65 FR 66644, November 7, 2000 and 66 FR 10632, February 16, 2001, are effective October 28, 2014.
      47 CFR Part 90