Atec Logimetrics-A600 Series - Manual (Page 4)

Option 12: RF Sample of the output (-50 dBc) (1)
Option 13: Chassis Slides for Standard 19" Rack Mounting
Option 14: Internal Preamplifier for rated power @ less than 0 input.
Option 15: Input Attenuator; 20 dB range (1)
Option 18: RF Input/Output Connectors on the Rear Panel
Other options available (2)
NOTES:
(1) Option may affect rated output power and gain
(2) Consult factory for features and other functions
(3) Typically -46 dBc AM; -55 dBc FM