[Premium-Rx] Harris RX Q

[Bill Strangfeld]

Can someone indicate what "EFK" mode is?  A Harris R-2368 (similar to
RF-590A), not mine, has "EFK" mode available in addition to LSB, USB,
CW, FM, and AM.  Bandwidths available in EFK mode are 2.7, 1.0, 0.3,
and 0.15.  One distinguishing feature is that the BFO adjusts in 1 Hz
steps in EFK but in 10 Hz steps in other modes.  Data or crypto
related?  Receiver is otherwise standard.

Thanks!
Bill Strangfeld W8FIX
bstrang at iac.net