toggle quoted messageShow quoted text
Is your uBitX in a shielded enclosure? It’s possible RF (normal radiation from the antenna) is getting into the circuitry.
On Aug 1, 2018, at 7:25 PM, Mike KK7ER <groupio@...
Our uBITX v3 behaves just fine when transmitting into a dummy load. But when transmitting into an end fed wire with SWR 1:1 it misbehaves. When transmitting CW, the uBITX gets stuck in transmit for a few seconds after I release the key. When pushing the PTT switch, it also sticks in transmit but the menu also comes up on the display. If the internal wiring was too long, I would expect the issue to show up with both dummy load and antenna. I suspected the counterpoise (coax shield) was bringing RF back into the radio. A number of sources seemed to suggest an "air choke" so I wound 20 feet of coax tightly around a plastic bottle and placed that between the antenna and feedline/coax but it made no difference. Any tips from the antenna gurus here would be very much appreciated.