Hello Folks, USA is back on the air using the HP 3586b Selective Level Meter as the exciter. I was able to program the unit via the HPIB portto do something moderately resembling DFCW with a 1/2 hz shift. I am not sure that I have the spacing correct between the elements, they seem to bunch together. Can someone please take a look and comment on the shift and the spacing. Thanks W1VLF PauLC