Attempting to set up ISS voice frequencies on a Yaesu FT-847 using OmniRig CAT control. Enter 145.800 FM for RX and 144.490 FM for TX. Rig recognizes frequencies when ISS is selected, and tracks for doppler. When I push PTT, I get "ERROR" on the TX Frequency. Any thoughts on how to correct the problem? Loon NA1SA