I don't have a schematic for the LA - 1K but I'm assuming like most amplifiers it has some kind of matching network that is switched between various bands on the input. That's what provides the 50 ohm match to the output of your exciter. It's possible you probably have overdriven the amplifier on some of the bands and damaged those input matching circuits, or they have just failed for some other reason. The amplifier most likely will probably have to go back to PalStar. You should contact them.
On Sat, Feb 18, 2023, 09:55 Jerry Leckness <kd4xr@...> wrote:
This morning while transmitting on 3.965mhz I noticed a HI SWR warning on my FTDX101MP. At the same time, the LA-1K displayed SWR=1.0 and the HF-Auto SWR = 1.04. I have discovered that the LA-1K RF Input has HI SWR while in "Operate" mode. In "Standby" mode the RF input has normal antenna/Tuner SWR. The LA-1K will NOT amplify on 160, 80, 40 but WILL amplify on 20, 15, and 10. On 10m 10w results in 200w out. It appears something has happened to the LA-1K RF input. Any ideas what's going on???
