with sampling device connected The matrix of measurements described in Section 73.151(c)(2)(i) includes a requirement for impedance measurements of the sampling line at or near carrier frequency ``with the sampling device connected'' (emphasis added). Some applicants have failed to submit this measurement. This particular impedance measurement is used as a baseline for the periodic re-certification measurements set forth in Section 73.155. As part of the re-certification measurements, Section 73.155(a)(3) requires licensees using sampling loops to repeat the impedance measurements of the sampling line with the loop connected, as noted in the preceding paragraph. This section stipulates that the frequencies measured must be the same as those used in the most recent proof, and also that the measured resistance and reactance must
pattern minimum or maximum, there shall be at least three measurement locations. The field strength shall be measured at each reference location at the time of the proof of performance. The license application shall include the measured field strength values at each reference point, along with a description of each measurement location, including GPS coordinates and datum reference. Add § 73.155 to read as follows: § 73.155 Periodic Directional Antenna Performance Recertification A station licensed with a directional antenna pattern pursuant to a proof of performance using moment method modeling and internal array parameters as described in § 73.151(c) shall recertify the performance of that directional antenna pattern at least once within every 24 month period. (a) Measurements shall be made