Although I strictly follow the tuning procedure described in section B on p.
14 in the instruction manual, my T4XB has suddenly changed behavoiur. The
output power on all bands has gone down from on average of 100 watts to 45
watts. The AC-4 bias reads .07 on the plate meter when the gain is fully CCW,
and the mode switch is on TUNE. With the GAIN at app. 9 o'clock, the reading is
0.15 A, and with the PLATE control the plate current is dipped - more
distinctly on some bands than others. Increasing the GAIN to maximum the
reading is 0.2 A. Alternately adjusting the PLATE and LOAD controls for maximum
RF output, the result is 45 Watts. As before SWR is low, so apparently the T4XB
is able to tune the antenna. But the LOADING control on 80 meters has to be
turned fully CCW to achieve the best result, whereas it before was between 3
and 4, which might indicate that the tuner doesn't work as it should. Add to
that the finals get hotter than before. So there must be a mismatch. The
question is where?
73 de Peter
OZ8CTH
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