AT-640A/ARN MARKER BEACON 75HZ

The AT-640A/ARN Antenna is a receive-only VHF Marker Beacon antenna used on both fixed-wing and rotary-wing aircraft. The antenna will meet the requirements of Military Specification MIL-A-5999 for electrical and environmental performance. The antenna is finished with a white Skydrol resistant polyurethane paint in accordance with Military Specification MIL-C-81773. The antenna has an operating temperature of -40° F to 140° F and experiences a drag force of 0.22 lb at airspeeds of 400 mph. Precipitation static is minimized through the use of a foam-filled fiberglass construction. The foam also reduces the effects of vibration, shock and temperature extremes.
Condition:

Application:	Marker Beacon
Frequency:	75 MHz
Impedance:	50 Ohms Nominal
VSWR:	1.5 to 1 Maximum
Polarization:	Parallel with force and aft of aircraft
Pattern:	Lobally Downward
Connector:	Type "C"
Max Weight:	1 lb Maximum
RF Power Capacity:	N/A
Gain:	-10.5 dB Minimum

"