USS Northampton AN/SPS-2
- Revisiting the Northampton history for more on the tropo ,I found this trivia on the unusual radar antenna mounted where the tropo dish appeared later;AN/SPS-2,other than a few photos the only thing I could find were these two items:
"Manufacturer: General Electric
Type of Radar: Long range Height Finding Search Radar
Power: 6.5 MW
Beamwidth: 1.6 x 2.7 degree beamwidth
Range Accuracy: 400 yards
Target Detection 1: Heavy Bomber at High Altitude at 300 nm
Target Detection 2: 1m2 Target at 165 nm
IEEE Band: L Band (100 MHz)
NATO Band: A Band
NOTES: Only two were built. Installed on CC-1 USS Northampton and CLG-4 USS Little Rock."
"Accession Number : AD0610487
Title : PRELIMINARY DESIGN OF THE AN/SPS-2 (XDQ) ANTENNA.
Descriptive Note : Interim rept.,
Corporate Author : NAVAL RESEARCH LAB WASHINGTON D C
Personal Author(s) : Adams,R. J. ; Kelleher,K. S. ; Lundquist,C. R.
Report Date : 04 FEB 1949
Pagination or Media Count : 98
Abstract : A report on antenna development for long-range search and height-finding radar systems is presented. One satisfactory X-band model of the AN/SPS-2 (XDQ) antenna was built and evaluated. It consists of a symmetrically-cut paraboloidal reflector of elliptical contour fed by an array of ordinary horns of limited aperture."
(this book may be available in some libraries)
Snippet from post #8847:
"The Northampton was said to have the most advanced multi-mode radar
in the 1950's as the CLC-1 Tactical Command ship;photos from 1954 on
show the multi waveguide fed diamond shaped antenna which was no
doubt the radar system described."
I saw this radar from the deck of the Northampton in the late 1950's and it was quite impressive with those 5-6 wave guide feeds in front of the reflector; it was also described as the most powerful radar in the world at that time(6.5MW) in this document:
which covers some related topics: experimental tropo from Wallaps Island VA to Dam Neck VA, and Wallops to Lewes DE; the first ship to ship tropo links,and the first ship to shore tropo, USS Thuban (1955).
Perhaps our Navy guru Nick(navy-radio.com)has more info on the SPS-2?