Hi all, newish ham here with a power supply issue. I just picked up 2 TYT 9800 50W quad band radios intending to use one as a base station and the other in a vehicle. For the base station I got a Pyramid PSV90 power supply. When I ran this setup on high power on the 2m and 70cm bands it seemed to work fine. On the 6m band when on high power, the power supply would "buzz" while transmitting and the radio would power off/reboot. When reducing the power to 20W, I get the same buzz from the power supply and the radio looks like it wants to shut off but just barely stays powered. 10 and 5W give no issues. I wanted to narrow things down to the power supply so I hooked up my second radio to it. On 6m it worked perfectly on all power settings. Here is where it gets weird. On 2m, it does the same thing the other radio did on 6m. I eliminated the power supply all together and ran it off a car battery. All bands worked fine at all power levels. I figured since it is only a 9A supply, it wasn't putting out enough power so I picked up a Pyramid PSV300 (30A) supply figuring that should fix the problems. I hooked it up to the first radio and on 6m it still buzzes and shuts down. I find it unlikely that I got two bad radios or that 30Amps isn't enough power to run these at 50W. I was testing the equipment after I bought it and had the antenna close by, could this be a RF issue with the power supply? It would seem strange that one radio would cause interference at only on the 50MHz band while the other would cause interference on the 144MHz band. Any ideas? Not sure where to go from here.