I have apparently tested and exceeded the limit by briefly sending about 90w rf at 50 MHz into the CH0 port of my nanovna-H. --by accident-- I wanted to upgrade to the larger display H4 model anyways. Although, note that despite this abuse, the broken nanovna still works as a signal generator. I was attempting to check a 100+ foot long coax cable by comparing the rx signal level at the rig with the signal level injected at the far end. But I bumped the keyer and fried CH0 port. I will look for any fried resistors or other items, but for now, I guess it's reduced to only a signal generator.
K3JT. Terry.
