Protek 7700  Spectrum Analyzer Adapter
Modulo Analizador de Espectro para osciloscopio. 

  Advanced DSP design converts any oscilloscope into a 1GHz spectrum analyzer. Requires minimum 20MHz Dual Trace Oscilloscope 
   Wide 10MHz to 1000MHz Frequency range
   -90dBm sensitivity
   Resolution Bandwidths to 3kHz
   Direct CRT readout of frequency and signal level
   Can be used for EMI and RFI compliance testing
   This Spectrum Analyzer is ideal for testing AM, FM, CB, Cellular, Marine, Aircraft and Cable Televison equipment
   Troubleshoot IF and RF circuits, wireless products such as two way radios, PCS, and cellular telephones, cable TV systems, wireless remotes, microphones and monitors
   On-screen markers with freq and level readouts
   Internal Calibration signal

http://www.tequipment.net/pdf/Protek/7700.pdf