[vintsqyuid]

AN/TPQ-37 Weapons Locating Radar supplied by Raytheon to the Indian Army works only upto 9000 ft. This is as per a US embassy cable created in 2005. it states

AN/TPQ-37 Weapons Locating Radar - These radars were advertised to work at elevations up to 10,000 ft, but due to problems with the travelling wave tubes, they are only operational to around 9,000 ft. Resolution of this technical issue is under review by Raytheon. Indian Army is dubious the Mini-Depot case supporting these radars will be delivered on time in April 2010. LOAs for Blanket Order Spares and CLSSA are being reviewed by the Indian Army with an offer expiration date of 6 NOV 09.