Hi Wald,
I did a search of the Fox Tango FT-980 newsletters and found pages 8348, 8349 and 8352 about keying a Heath linear. Does this seem to be the relay mod? If it is the mod it is a Yaesu approved mod that you had to do yourself with parts supplied by Yaesu.
Suggest searching the Newsletter pdf in the files section when you start checking out the other mods.
73
Roger VE7LB
