Agilent / HP / Keysight 11715A
11715A AM/FM Test Source
Description
This unit provides very flat, wide bandwidth, and low distortion amplitude or frequency modulated RF signals.
It is designed primarily for performance tests and adjustments of the Agilent 8901A/B modulation analyzer and Agilent 8902A measuring receiver, it will also serve as a high quality modulated test oscillator where its frequency ranges apply.
The major components of it are a low noise voltage controlled oscillator (VCO), 2 digital dividers, and a double-balanced mixer.
The VCO is the primary signal source, with a typical frequency range of 330 to 470MHz at the FM output.
FM is produced by directly coupling the external modulation source to the VCO's tune input, providing very wide bandwidth modulation with low phase shift.
This design also ensures very little incidential AM.
It can also be used in conjunction with an 8901A/B and an 8902A as a calibrated signal source for special applications.
In particular, the U.S. commercial FM broadcast band of 88 to 108MHz is covered by the FM divide by 4 output of it.
Key Points
High-quality modulated test oscillator
Wide bandwidth modulation with low phase shift
Designed for low incidential AM
Specifications
Frequency range:
AM FM ÷ 32 output: 11 to 13.5MHz
FM ÷ 4 output: 88 to 108MHz
FM output: 352 to 432MHz
Peak deviation:
11 to 13.5MHz carrier: >12.5KHz
88 to 108MHz carrier: >100KHz
352 to 432MHz carrier: >400KHz
Distortion:
50% AM, 20Hz to 100KHz rates: <0.05% THD (<–66dB)
95% AM, 20Hz to 100KHz rates: <0.1% THD (<–60dB)
Flatness:
50Hz to 50KHz rates: ±0.1%
20Hz to 100KHz rates: ±0.25%
