1kw linear causing relays to chatter in the driver app. I can even hear it in the radio

[M TUBESARE GREAT]

Okay it's my first post but I'm going to try this out cuz I'm at a lost. I've got a Homebrew 813 amp it's been set up for 10 m. The amp does right wattage nothing wrong on the transmission side but when it's sitting there idling after you on key after about 10 seconds it will start to chatter the relays in the driver box and then it will start to back it up into the radio so I don't I think this is oscillating I don't know for sure what it's called but I need help with it cuz I can't figure it out