Hi All
I have a suggestion, note I dont have a uBITX yet, I have one ordered so I cannot test this.
?If you disconnect the PA power at the DC input socket the transmitter wont produce RF.
The path from the antenna to the PA output transformer is DC when the PTT is activated, note the PA transformer end it at earth.
Use a multimeter set to ohms and measure the resistance between ground on the radio board and the antenna output while activating the PTT, it should be very low.
You also need to check the bands that activate the other LOW pass filters.
Hopefully this can help steer the thinking in others.
Best regards
Chris
ZL2TCH?
