Ground tested - Serviceable. Curses.
Sorry to throw this in on a light aircraft problem when this forum is aimed at big aircraft. But...A BE76 Duchess I fly has very poor range on both its King type VOR receivers. It will only pick up the VOR within 25 miles at 6000 ft on one set, and the other nav set only gives 5 miles. Both audios are incredibly noisy with lots of hash sounds and the ATIS is unreadable due hash.
This is Melbourne VOR in Australia, flat terrain and ground station and other VOR's nearby are definately serviceable.
Despite this, the technicians have checked the aircraft with their PFM gizmo on the ground, and they say both sets are 100% serviceable. Are there any experts among you that can advise possible causes of poor VOR performance in the aircraft while airborne.