http://radiowavesokc.homedns.org:8080/Public/Manuals/Nautel/ND1-Technical-Instruction-Manual.pdf
http://radiowavesokc.homedns.org:8080/Public/Manuals/Nautel/P400%20-%20April%201986.pdf
http://radiowavesokc.homedns.org:8080/Public/Manuals/Nautel/VS2.5-PRE-8.0.pdf
http://radiowavesokc.homedns.org:8080/Public/Manuals/Nautel/VS300-PRE-6.0.pdf