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MICROWAVE MODULE TESTS
Antenna Tuning Procedure
Gunn Oscillator Transmit Frequency
You need to check the antenna transmit frequency before making any adjustments to the antenna.
Required equipment:
(1) Microwave frequency converter capable of reading up to 25GHz
(2) K-band horn with at least a 10dB gain
(3) Waveguide to coax transition
(4) Low-loss coax cable
Set up the equipment as follows:
Microwave horn
Frequency counter
Waveguide to coax adapter
Antenna under test
(1) Turn on the radar.
(2) Activate the antenna.
(3) Point the radar at the horn antenna.
(4) Because the horn antenna is in the near field region of the transmitting antenna, its presence will cause a
slight change in the transmit frequency. Adjust the distance between the two antennas, so the measured
frequency is at a minimum.
(5) Record the K-band antenna frequency. 24.1GHz to 24.2GHz are the correct ranges for the frequency
bands.
(6) Adjust the tuning screw on the Gunn diode for a reading of 24.150GHz±10MHz for K-band antennas. Do
not tune the frequency unless frequency is out of band
For information regarding service or replacement, contact the factory at 800.428.4315 (217.428.4315 if you
are calling from outside the US.)
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