[ARC5] APG-4?

[Michael]

I suspect it is an APN-1 at heart, just modified for another application.
Note from Wikipedia:

"AN/APG-4, L band low altitude torpedo release / aiming radar for TBM, with
nicknamed Sniffer."  

Due to the variety of definitions of the various letter bands, the following
URL may help: http://www.jneuhaus.com/fccindex/letter.html

Best regards,
 
Michael, WH7HG BL01xh
http://www.nationalmssociety.org/chapters/NTH/index.aspx 
http://wh7hg.blogspot.com/ 
http://kludges-other-blog.blogspot.com 
Hiki Nô!