The Tektronix 7K11 is a cable TV pre-amplifier plug-in for 7000-series scopes. It is intended for use with a 7L12 or 7L14 set to a -30 dBm reference level (on its 50 Ω input). The reference level selected on the 7K11 is calibrated in dBmV.
The 7K11 covers frequencies from 30 MHz to 890 MHz. It has an input impedance of 75 Ω and uses a BNC connector for its input.