I am looking into buying a external DSP device for contesting as my Yaesu FT-840 is crappy on SSB/RTTY as I can hear stations as far as 2.5KC away from me. Was loking at the MFJ-784B I think it is as it is $200.00 cheaper than the TIMEWAVE DSP-599z. So was wondering if anyone has used or is using one of these devices, the MFJ that is... Jacob Tennant - K8JWT