1-103
Troubleshooting
RF Path Description (Frequency Generation, Level Control, and Modulation)
RF Path Description
(Frequency Generation, Level Control, and Modulation)
The RF path can divide, pass through, and multiply the A28 YIG Oscillator (YO) signal to generate
the desired RF frequency. Depending on models and options, the RF path includes the hardware for
amplitude, pulse, and digital (I/Q) modulation, and to control the RF output power level. The
Synthesis /Reference Block Description (page 1-95) provides information on generating
fundamental frequencies of 3.2 GHz to 10 GHz.
All RF signals originate from the A28 YIG Oscillator (YO) output frequencies of 3.2 GHz to 10 GHz.
RF output frequencies below 3.2 GHz are generated by dividing the YO signal on the A6 Frac–N
and A8 Lowband Output assembly. RF output frequencies between 3.2 and 10 GHz pass through
the A29 20 GHz Doubler. RF output frequencies between 10 to 20 GHz are generated by doubling
the 5 to 10 GHz YO signal in the A29 20 GHz Doubler. RF output frequencies above 20 GHz are
generated by doubling the 10 to 20 GHz signal out of the A29 20 GHz Doubler in the A27 40 GHz
Doubler.
Analog Model Hardware
In analog models, the RF Path comprises the following:
• A29 20 GHz Doubler
• A6 Frac–N
•A8 Output
•A30 Modulation Filter
• A27 40 GHz Doubler (40 GHz models)
• 1E1 Attenuator (if option is installed)
• 1E6 (if fast pulse below 3.2 GHz option is installed)
Vector Model Hardware
In addition to the analog hardware, vector models add the following hardware:
• A35 3 - 20 GHz I/Q Modulator
• A13 I/Q Multiplexer
Some assemblies in vector models differ from those in analog models. Vector models include:
• an A8 Output assembly that includes an I/Q modulator for frequencies below 3.2 GHz
• an A19 Power Supply and A31 Motherboard that can handle increased power requirements
• an A26 Microcircuit Interface Deck and front and rear panels that provide the digital interface
• a baseband generator (Option 002/602) for internal I/Q waveform generation
• an internal hard drive (Option 005) for internal waveform storage
A29 20 GHz Doubler
The A29 20 GHz Doubler provides RF signals to the:
• synthesis loop (described on page 1-95)
• low (<3.2 GHz) band RF path (to the A6 Frac–N)
• high (>3.2 GHz) band RF path
Frequencies 3.2 to 10 GHz pass through the A29 20 GHz Doubler. Frequencies 10 to 20 GHz are
generated in the doubler by doubling the 5–10 GHz YO signal. Frequencies >3.2 GHz are routed to
To Next Page
Loading...
Need help?
General
