Table 10-16 Harmonic Mixing Number Versus Center Frequency; Confirming Span Problems; Yto Main Coil Span Problems (Lo Spans >20 Mhz) - HP 8560E Service Manual

Synthesizer Section
Frequency Span Accuracy Problems
Table 10-16 Harmonic Mixing Number versus Center Frequency
Center Frequency
1 kHz to 2.9 GHz
18 GHz to 325 GHz
3. Use the following equation to determine the first LO span used.
4. Refer to
Confirming Span Problems
1. If all first LO spans or only first LO spans of 2.01 MHz or greater are
2. If first LO spans of 2 MHz or less only are faulty, suspect the A14
3. If there are several spans in the main coil and FM coil ranges
YTO Main Coil Span Problems (LO spans >20 MHz)
For YTO main coil spans, the YTO is locked at the beginning of the
sweep and the sweep ramp is summed into the main coil tune driver.
1. Perform the YTO adjustment procedure in Chapter 2. If the YTO
2. Set the HP 8560E/EC to the following settings:
556
First LO Span = ------------------------------------------------------------------------------------------------- -
Current Band Harmonic Mixing Number
Table 10-15 on page 555
with the span.
affected, perform the YTO Adjustment procedure in Chapter 2.
• On the HP 8560E/EC press
spans.
• If the YTO adjustment has sufficient range and only LO spans of
2.01 MHz or greater are faulty, test YTO linearity by performing
step c.
• Test the span in question at different center frequencies in the
same band. If the span accuracy changes significantly (2% or
more), suspect the A11 YTO.
fractional N PLL.
affected, suspect the A14 span attenuator.
adjustments cannot be performed, continue with step 2.
Start frequency .......................................................... 10 MHz
Stop frequency ........................................................... 2.9 GHz
Harmonic Mixing Number
1
6 through 54 depending upon
lock harmonic selected
Display Span Setting
to determine the circuit associated
,
CAL REALIGN LO &IF
, and retest all
Chapter 10