High SWR False & Shutdown

Raul Pla

I have a 2021 PGXL with a 6600. Shows a false 2.5:1 SWR then instant shutdown. The antenna is a tuner under the 43 FT vertical. After the tuning process and SWR is at 1.4:1 to 1.7:1, verified by an antenna tester AND a digital power meter on the desktop.. I can run the 6600 up to 110W (full out) and its fine. If I run the PGXL to a similar 120W it shuts down for 2.5:1 SWR.

I then used an oil can dummy load with a 1:1 SWR verified by the SWR meter. The PGXL shows SWR ranging from 1.5 to 1.7. When I raise the exciter power so the PGXL is around 500W It starts the power reduction step and warning. On a 120V outlet for now, however this used to provide 600-700 out in the past.

To be clear: The 1:1 SWR on the dummy load shows 1.5 1.6 or 1.7 on the PGXL PC window.

Similar issue on all bands except 80m. The network disconnects and reconnects 2 or 3 times while I was testing. I saw some messages about this very same issue in the past but no resolution besides opening a service ticket.

Im hoping I might do some adjustment and avoid the shipping costs and service costs.

Any help or updates on a solution?