HP 11721A, Frequency DoublerCondition:* Used, Unable To Test. Sold As-Is. As Pictured.Additional Notes:* Works with any RF source with output in the range 50 to 1300 MHz* Low conversion loss and spurious* Excellent flatness over the entire frequency range* Input: 50 to 1300 MHz* Output: 100 to 2600 MHz* Conversion Loss (+13 dBm input, 50 to 1280 MHz) <15 dB* Spurious Referenced to Desired Output Frequency f(+13 dBm input with Harmonics < -50 dBc, 50 to 1280 MHz) f/2, -15 dB; 3f/2, -15 dB* Input SWR: 1.5, Typical* Input/Output Impedance: 50 Ohms Nominal* Connectors: Type NHP 11721A