Chapter 2 61
Overall Troubleshooting
Troubleshooting Using Front Panel Keys
1st LO State
Center Freq - Allows the center frequency to be changed.
1st LO Mode - This key shows which of four possible LO modes the
instrument is in.
Note: the following description assumes the instrument is in auto
coupled mode (phase noise optimization under the auto coupled
menu is set to Auto). The span breaks mentioned below will be
different if the phase noise optimization is set manually or the sweep
rate is not auto coupled.
Dual loop mode is chosen when the frequency span is < 2MHz.
Single loop mode is chosen when the frequency span is ≥ to 2 MHz.
— Dual-Wide means the synthesizer is in dual-loop wide mode. If
the span is ≤ 141 kHz the instrument is set to Dual-Wide.
— Dual-Narrow means the synthesizer is in dual loop narrow mode.
If the span is 142 kHz to 1.99 MHz, the instrument is set to
Dual-Narrow.
— Single-Narrow means the synthesizer is in single loop narrow
mode. If the span is 2 MHz to 10 MHz, the instrument is set to
Single-Narrow
— Single-Wide means the synthesizer is in single loop wide mode. If
the span is >11 MHz, the instrument is set to Single-Wide.
DL Band Harm - Dual Loop Band Harmonic. This key is greyed out
unless the instrument is in dual loop mode (span < 2 MHz). The Dual
loop harmonic is 1 when the center frequency is set to less than
approximately 6.6 GHz. The actual center frequency where band
harmonic changes is based on frequency span. For span = 1.99 MHz,
the instrument uses dual loop band harmonic 1 at center frequency
6.598808 GHz and band harmonic 2 at 6.5990070 GHz center
frequency. DL band harmonic 4 is used from center frequency
13.3 GHz and above.
SmpIF Start - Shows the start frequency of the IF sampler. This can
be a negative number or positive number. This frequency can be
measured at J7 of the Sampler Assembly.
SmpIF SwpDir - Shows the Sampler IF Sweep Direction. This can be
positive or negative to indicate which direction the sampler
frequency sweeps or steps. A positive number means the sampler is
swept or stepped higher in frequency.
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