Accession Number:

AD0276489

Title:

S-BAND BEACON PRF COMMAND SYSTEM

Descriptive Note:

Corporate Author:

NORTHEASTERN UNIV BOSTON MASS ELECTRONICS RESEARCH LAB

Personal Author(s):

Report Date:

1961-12-22

Pagination or Media Count:

1.0

Abstract:

Work was done on an S-band beacon prf command system. This system is to provide the capability of performing an event at a predetermined altitude within an accuracy of 1 km. by changing the ANDPN-41 S-band beacon prf from a normal mode of 410 pps to a command mode of 365 pps. The command is manually operated at the radar site and initiated when the vehicle crosses predetermined grids set upon the plotting board. The final airborne system is completely solid state and features a unique detection method of a change in prf. In the event of a beacon link failure, internal circuitry is provided to actuate the output circuit to fire a squib or other device at an alternate time. Two types of filters are discussed for detection of changes in prf. The first, an active filter using vacuum tubes, was found to be sensitive to changes in the amplitude of the beacon pulse and too critical with regard to component values. These findings were the result of field tests and led to the development of a second version which basically consists of a monostable multivibrator and associated circuitry. Author

Subject Categories:

Distribution Statement:

APPROVED FOR PUBLIC RELEASE