47 CFR § 18.309
Frequency range of measurements
February 16, 2021
(a) For field strength measurements:
Open Table
| Frequency band in which device operates (MHz) | Range of frequency measurements | |
|---|---|---|
| Lowest frequency | Highest frequency | |
| Below 1.705 | Lowest frequency generated in the device, but not lower than 9 kHz | 30 MHz. |
| 1.705 to 30 | Lowest frequency generated in the device, but not lower than 9 kHz | 400 MHz. |
| 30 to 500 | Lowest frequency generated in the device or 25 MHz, whichever is lower | Tenth harmonic or 1,000 MHz, whichever is higher. |
| 500 to 1,000 | Lowest frequency generated in the device or 100 MHz, whichever is lower | Tenth harmonic. |
| Above 1,000 | ......do | Tenth harmonic or highest detectable emission. |
(b) For conducted powerline measurements, the frequency range over which the limits are specified will be scanned.
[50 FR 36070, Sept. 5, 1985, as amended at 51 FR 17971, May 16, 1986]
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