University of Hawai'i at Mānoa School of Ocean and Earth Science and Technology Radio Oceanography Laboratory Generic High Frequency Doppler Radar Synthesizer-Transmitter Unit Model MK3-PW-PA-TX User Manual April 2022 v. 2 radlab@satlab.hawaii.
FCC Supplier’s Declaration of Conformity University of Hawai'i Generic High Frequency Doppler Radar Synthesizer-Transmitter Unit, model MK3-PW-PA-TX. This device complies with part 15 of the FCC Rules. Operation is subject to the following two conditions: (1) this device may not cause harmful interference, and (2) this device must accept any interference received, including interference that may cause undesired operation.
Table of Contents User operation of Synthesizer-Transmitter Unit, model MK3-PW-PA-TX................................4 1. Overview......................................................................................................................... 4 2. Start-up procedure.......................................................................................................... 5 3. Toggling between signal types........................................................................................ 5 4.
User operation of Synthesizer-Transmitter Unit, model MK3-PW-PA-TX 1. Overview The unit is programmed to emit a repetition of frequency sweeps (chirps), typically at a rate of 1Hz to 4Hz and an occupied bandwidth of 25 to 220kHz determined by the ITU frequency allocation (see Table 1), resulting in a frequency-modulated continuous wave (FMCW mode, emission designation F1N). Table 1. Allocation for Oceanographic High Frequency Doppler radars in Region 2. Center (MHz) 4.463 5.2625 13.500 16.150 24.550 26.
To comply with FCC RF exposure requirements, the antennas must be installed to ensure a minimum separation distance from persons while operational as shown in the table below: Table 2. Minimum separation to comply with FCC RF exposure requirements Operating Frequency (MHz) 4.463 5.2625 13.500 16.150 24.550 26.310 Minimum Separation Distance (m) 10.66 10.66 3.55 3.55 2.30 2.30 2. Start-up procedure The following steps must be performed in the order given: 1.
3. Toggling between signal types Two signal types are allowed: standard frequency-modulated continuous wave chirp for normal radar operation, and continuous tones for calibration. Continuous tones can be programmed at three distinct frequencies: at the lower limit of the allocated bandwidth f0-bw/2, at the center frequency f0 and at the upper limit of the allocated bandwidth f0+bw/2. To toggle between signal types: 1. 2. 3. 4. open a browser on the unit’s IP address, obtain a screen similar to figure 1.
Figure 1. Web interface for programming the synthesizer/transmitter. Only the frequency for which a low-pass filter has been installed can be selected. Figure 2. Diagnostic page with DDS registers read-back.
5. Illustrations Figure 3. Above: Synthesizer-Transmitter Unit model MK3-PW-PA-TX, door closed. Below: device identification label, affixed to the top right of the enclosure door. The factoryprogrammed operating frequency and output power are marked, here 16.150 MHz/30W.
Figure 4. Synthesizer-Transmitter Unit, door open. Bottom rails: power supplies with circuit breakers. Upper rail: digital synthesizer and controller processor. On the right wall: the power amplifier module and the low-pass filter.
Figure 5. Synthesizer-Transmitter Unit, right side view. The twin-fan forced air flow heat exchanger unit is seen. Figure 6. Synthesizer-Transmitter Unit, bottom view. Connector plate with IEC-C13/C14 power inlet, RJ45 jack for CAT6 Ethernet, N-type bulkhead adapter for cable to antenna (a Bird 100-SA-FFN-30 power attenuator is attached).
