Keywords: pdbi-trouble

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## Multi-dish continuum OK, but no fringes on one antenna on XAFF

(This means at least two bad baselines, usually...)

- Phase lock not properly closed. Look on spectrum analyser
- Bad frequency (harmonic number) on that antenna. Make a single-dish spectrum on a strong line source to check if possible.
- Retune receiver to correct harmonic number, after resetting LO2.