I remember posting on the old weatherforum a question regarding Reception percentage on my cabled Vantage Pro Plus, and many folks had offered suggestions on how to eliminate what looked like interference. I took SLOweather's suggestion and added ferrite clamps to all the cables, moved the station wiring around, ran it on battery, and nothing seemed to help the problem.
Reception looked like this:
and
Yesterday, I updated the firmware in the console from 1/8/2004 Rev B to 3/20/2004 Rev B (the last VP1 version) using the Davis updater, and the reception returned to what should be considered 'normal'.
and lastly.. here's the Current one (updated at 5 minute intervals)
Moral: if you have a pre-3/20/2004 Rev B Vantage Pro -- consider updating the flash to the last VP release.
Best regards,
Ken