Today I noticed that, after transmitting for a few seconds, the high SWR warning would come on and my signal would drop off the transponder. It has been raining all day. I have the TX feed to the dish covered with a plastic bag. I did have a high SWR issue in the past but the bag cured it, at least until today. What seemed odd was that the SWR was low and my signal on the downlink strong for the first few seconds, then the SWR spike. I hope it is just rain that is causing the spike, but why would there be a few seconds of low SWR at the start of a transmission? Any ideas?
Setup: FT-817ND, SG Lab upconverter and 20w amp, BamaTech feed, 80cm dish
73, Bill OM3BD