HP 8753E - 2 ND lo Waveforms; 90 Degree Phase Offset of 2 Nd lo Signals in High Band

2ND LO Waveforms
The 2nd LO signals appear different in phase and shape at different frequencies.
90 Degree Phase Offset of 2nd LO Signals in High Band. In high band, the
2nd Lo is 996 kHz. As indicated by Figure 7-13, the 2nd Lo actually consists of
two signals 90 degrees out of phase.
-1.00000 “.OO
0.00000 mc
Figure 7-13.
sg615s
90 Degree Phase Offset of High Band 2nd LO Signals (216 MHZ CW)
In-Phase 2nd LO Signals in Low Band. The 2nd Lo signals in low band, as
shown in Figure 7-14, are not phase shifted. In low band these signals track the
RF output with a 4 kHz offset.
SourceTroubleshooting 7-21