Hello to the list, I have an Omni model 546, series C, s/n 546-44xx. On the lower left of the front panel it says "Omni", not "Omni A" or "Omni D" and the front panel is different from the Omni D front panel pictured in the manual I have. Can anyone please help me identify this properly, and point me to the correct manual? Thanks and 73, Mike W2IY