----- Original Message ----- From: <hwhall at compuserve.com> > http://aafradio.org/docs/C-131.html > > Some sort of autotune device, apparently. A "Yardeny Spot Tuner," specifically designed to match the A.R.C. receiver with the AN/ART-13 Autotune transmitter. Most often seen mated to an R-26, you do occasionally see them installed on R-27. 73 DE Dave AB5S