Early radios used 262 kHz for the I.F. The Belar RFA-2 AM RF Amplifier has an output freq of 260 kHz. See: http://en.wikipedia.org/wiki/Intermediate_frequency Tom Osenkowsky, CPBE >I would expect it is likely an audio device since the 455 khz IF in an AM >radio would take a fairly large antenna to pick up at much of a distance.