What wire guided machines are you using? Some of the older ones require specific line drivers due to frequency output.
Most newer wire guided forklifts can use several different frequency / can be tuned in.
The back up battery inside the line driver is important as it helps stop power cuts / surges taking out the sensitive electronic cards.
This is ONLY to be used to report flooding, spam, advertising and problematic (harassing, abusive or crude) posts.