This thread caught y attention as it is the same problem that I am having with my system. My Set up: Radio: Kenwood TS-480 SAT Computer: ASUS Model 512J Notebook PC Running Windows 10 Up to Date Rig Conrol OMNIRIG Radio Interface SignaLink USB Before Downloading VarAC, I noticed a prerequisite stating the following: VarAC prerequisites VARA-HF 4.6.9 or higher / VARA-FM 4.2.7 Optional: OmniRig but only V1.2I am very interested in this thread. I, also, have a problem with VaraC and VARA HF. When loaded the VaraC and installed it, neither the VaraC nor the VARA-HF would transmit. I updated my Vara HF as well as my VARA FM to the prerequisite versions. The VARA-FM worked well. The problem is with the VARA-HF. After I downloaded the correct version and installed it, I noticed that when I went to transmit the following indications were noticed: The SignalLink did not go into Transmit (the RED LED did not come on) The TS-480SAT would go into TRANSMIT but no transmit power was noted. After the VARA-HF finished it's calling cycle, it would STOP and the TS480SAT would drop transmitting. I did try loading the VarAC and installing it. The program acted exactly as the VARA-HF in a transition cycle. However, I did not see any call signs, or any CQs being called. I enlisted the help of a fellow ham and we worked for about 8 hours on the transmitting problem. We did try the VarAC program on the older version of the VARA-HF program and of course it did not work at all. Our solution was to revert back to an older version of the VARA-HF and delete the VarAC program entirely. I do not know where to go now with this problem. Could there be a problem with the program and the Kenwood TS-480SAT compatibility? I do not know. Thanks for listening to me 73, Milford N3WYG