Here's my situation: The TS-520S is new to me, but seems to work fine except for he DG-5 display that it came with. Receiver is great and it tunes fine with full power out - nothing unexpected, although the receiver sometimes has an annoying crackling/sizzling sound - separate problem I'm sure. Antenna is a is a ladder line-fed 40 meter inverted V at around 35 ft, about 5 ft of coax between the transmatch and 4:1 balun where it goes into the 450-ohm ladder line outside. DC ground is about 4 ft long, connected to one of those gas discharge tube lightning arrestors between the coax and balun and the electrical service conduit about 1 ft above the ground (buried electrical service). Ladder line is about 38 ft in length. I don't think I'm getting common mode current/RF in the shack. Nothing else is going haywire and no TVI. When installing the antenna I put a 100K resistor across the feed point to bleed off static buildup. So, when I transmit (CW) or switch "rec/send" to send (without transmitting) the display shows a frequency about 800Hz lower, then when going back to receive it returns to the original frequency. RIT is OFF. Happens on all bands - same 800 Hz drop. I don't have a mic for this radio yet, so don't know if it happens on SSB. Same when connected to a dummy load.