ANTENNA MAST FOR EMI / EMC TESTING

The AM-400 antenna mast is suitable for making EMC measurements in an Open Area Test Site or test chambers. It can vary the antenna height from 1-4 meters during measurement as required by commercial EMC test specifications.

The mast is constructed using fiberglass tubes and grating material. This material was chosen because they minimize signal reflections and have a high degree of immunity to deterioration from exposure to sunlight and moisture. The cross boom of the mast is a single fiberglass tube attached to a carrier assembly. The carrier assembly rides the length of entire mast pulled by a rope and pulley mechanism attached to a motor. The cross boom has a antenna mounting adapter located on one end. This adapter was designed to mount antennas such biconical, logs and horns. The antennas can be mounted in vertical or horizontal polarization using this adapter.

For safety, the carrier assembly has a spring loaded friction brake that engages against mast to prevent inadvertent decent should the rope break. In addition a second brake which is integral with the motor assembly engages if power is turned off. This brake will also stop the carrier at any point on the mast during the tests when the remote switch is in the off position. The mast can be tilted at the base and laid flat on the ground when not in use.

SPECIFICATIONS

Model	Maximum antenna height	Minimum antenna height	Mast height
AM-400	4 meters	1   meters	5 meters

Model	AM-400
Maximum load capacity	15 lbs. (6.8 kg)
Motor	1/20 HP AC Gear motor
Power	115 VAC, 60 Hz
Remote Switch	Reversing Drum
Standard extension cable length	32.6 feet ( 10 meters)
Approx. Weight	200 lb. (90 kg)