Author Topic: No RF Output  (Read 308 times)

G3EJS

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No RF Output
« on: April 08, 2018, 11:21:25 AM »
On the one μ BITX I had no output. 597mA idle on TX, 603mA with CB whistle into mic. I can hear a signal on a nearby RX, so looks like something in the driver/finals I have two, changed all the connections to the other board, and get a decent output.
Did not look like the finals, as the bias current was roughly right.
First thoughts are that T10 is incorrectly wired or all four 4904 drivers were US, neither of which  seemed likely!
Put the scope on and had a good level going in to the drivers, and nothing coming out.
Turns out the windings of  T10 were shorting, the enamel was flaking off the wires.
Rewound it and all is fine.