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Thanks for clarifying - anything that limits chaos is appreciated.
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I remember a picture showing three LEDs of which one ws off and two were on. What board had the LED off ? The PLL voltages may be jumping around because the spectrum analyzer (SA) is SWEEPING. You can eliminate this by doing either of two things: 1) set the sweep mode to MANUAL - then use the RPG to vary the center frequency (probably set start=2GHz, stop=7GHz) 2) Set the FREQUENCY SPAN to 0Hz; then press CENTER FREQUENCY and use the RPG to vary the frequency Method 1 is probably easier - Watching the PLL voltages when the center frequency is fixed gives a better idea of whether the PLLs are locked. It might be instructive to do a manual sweep from 2-7GHz and take note as to whether the YTO unlock is always on or not. If it is locked some times, get some idea as to where. The basic idea is to force the SA to tune the YIG across its frequency span and to see if/where the YTO unlocks. If the unloc is frequency related, adjustment may help. If it is unlocked everywhere, more likely a hardware problem. Cheer! Bruce Quoting Jinxie <paul666@...>: A bit of clarification is certainly in order at this point, especially given there may be people new to the thread who haven't read it all through. |
